AMERICAN AADVANTAGE FUNDS
485BPOS, 2000-03-01
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<PAGE>   1
      As filed with the Securities and Exchange Commission on March 1, 2000

                                                      1933 Act File No. 33-11387
                                                      1940 Act File No. 811-4984

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM N-1A

         REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933         [ X ]
                  Pre-Effective Amendment No.                            [   ]
                                                      ------
                  Post-Effective Amendment No.          29               [ X ]
                                                      ------

                                     and/or

         REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940 [ X ]

                  Amendment No.                         30
                                                      ------

                        (Check appropriate box or boxes.)

                            AMERICAN AADVANTAGE FUNDS
               (Exact Name of Registrant as Specified in Charter)

                           4333 Amon Carter Boulevard
                             Fort Worth, Texas 76155
               (Address of Principal Executive Office) (Zip Code)
       Registrant's Telephone Number, including Area Code: (817) 967-3509

                           WILLIAM F. QUINN, PRESIDENT
                           4333 Amon Carter Boulevard
                             Fort Worth, Texas 76155
                     (Name and Address of Agent for Service)

                                    Copy to:
                              ROBERT J. ZUTZ, ESQ.
                           Kirkpatrick & Lockhart LLP
                          1800 Massachusetts Avenue, NW
                              Washington, DC 20036

         Approximate Date of Proposed Public Offering     March 1, 2000
                                                      -------------------------

It is proposed that this filing will become effective (check appropriate box)

         [ X ]  immediately upon filing pursuant to paragraph (b)

         [   ]  on (date) pursuant to paragraph (b)

         [   ]  60 days after filing pursuant to paragraph (a)(1)

         [   ]  on (date) pursuant to paragraph (a)(1)

         [   ]  75 days after filing pursuant to paragraph (a)(2)

         [   ]  on (date) pursuant to paragraph (a)(2) of Rule 485.

Registrant has adopted a master-feeder operating structure for each of its
series. This Post-Effective Amendment includes signature pages for the AMR
Investment Services Trust and the State Street Equity 500 Index Portfolio, the
master trusts, and the American AAdvantage Funds, the feeder trust.


<PAGE>   2



                            AMERICAN AADVANTAGE FUNDS
                       CONTENTS OF REGISTRATION STATEMENT

This registration statement is comprised of the following:

                  Cover Sheet

                  Contents of Registration Statement

                  Prospectus for the Institutional Class consisting of the
                  following American AAdvantage Funds: Balanced Fund, Large Cap
                  Value Fund, International Equity Fund, Small Cap Value Fund,
                  S&P 500 Index Fund, Intermediate Bond Fund, Short-Term Bond
                  Fund, Money Market Fund, Municipal Money Market Fund and U.S.
                  Government Money Market Fund

                  Prospectus for the PlanAhead Class consisting of the following
                  American AAdvantage Funds: Balanced Fund, Large Cap Value
                  Fund, International Equity Fund, Small Cap Value Fund, S&P 500
                  Index Fund, Intermediate Bond Fund, Short-Term Bond Fund,
                  Money Market Fund, Municipal Money Market Fund and U.S.
                  Government Money Market Fund

                  Prospectus for the AMR Class consisting of the following
                  American AAdvantage Funds: Balanced Fund, Large Cap Value
                  Fund, International Equity Fund, Small Cap Value Fund, S&P 500
                  Index Fund-Institutional Class, Intermediate Bond Fund and
                  Short-Term Bond Fund

                  Prospectus for the Platinum Class of the American AAdvantage
                  Money Market Fund, American AAdvantage Municipal Money Market
                  Fund, American AAdvantage U.S. Government Money Market Fund,
                  American AAdvantage Money Market Mileage Fund, American
                  AAdvantage Municipal Money Market Mileage Fund and American
                  AAdvantage U.S. Government Money Market Mileage Fund

                  Statement of Additional Information for the AMR Class,
                  Institutional Class and PlanAhead Class of the following
                  American AAdvantage Funds: Balanced Fund, Large Cap Value
                  Fund, International Equity Fund, Small Cap Value Fund, S&P 500
                  Index Fund, Intermediate Bond Fund, Short-Term Bond Fund,
                  Money Market Fund, Municipal Money Market Fund and U.S.
                  Government Money Market Fund

                  Statement of Additional Information for the Platinum Class of
                  the American AAdvantage Money Market Fund, American AAdvantage
                  Municipal Money Market Fund, American AAdvantage U.S.
                  Government Money Market Fund and American AAdvantage Money
                  Market Mileage Fund, American AAdvantage Municipal Money
                  Market Mileage Fund and American AAdvantage U.S. Government
                  Money Market Mileage Fund

                  Part C

                  Signature Pages

                  Exhibits



                                      C-2

<PAGE>   3
                              INSTITUTIONAL CLASS

                                   [AMR LOGO]

                                   PROSPECTUS
                                 MARCH 1, 2000

                        [AMERICAN AADVANTAGE FUNDS LOGO]


EQUITY FUNDS

o    BALANCED FUND

o    LARGE CAP VALUE FUND

o    SMALL CAP VALUE FUND

o    INTERNATIONAL EQUITY FUND

o    S&P 500 INDEX FUND

BOND FUNDS

o   INTERMEDIATE BOND FUND

o   SHORT-TERM BOND FUND

MONEY MARKET FUNDS

o   MONEY MARKET FUND

o   U.S. GOVERNMENT MONEY MARKET FUND

o   MUNICIPAL MONEY MARKET FUND



The Securities and Exchange Commission does not guarantee that the information
in this Prospectus or any other mutual fund's prospectus is accurate or
complete, nor does it judge the investment merit of these Funds. To state
otherwise is a criminal offense.


<PAGE>   4

                  [AMERICAN AADVANTAGE FUNDS INST. CLASS LOGO]

TABLE OF CONTENTS

<TABLE>
<S>                                                 <C>
About the Funds
Overview..........................................    2
Balanced Fund.....................................    3
Large Cap Value Fund..............................    6
Small Cap Value Fund..............................    8
International Equity Fund.........................   10
S&P 500 Index Fund................................   12
Intermediate Bond Fund............................   14
Short-Term Bond Fund..............................   17
Money Market Fund.................................   19
U.S. Government Money Market Fund.................   21
Municipal Money Market Fund.......................   23
The Manager.......................................   25
Equity 500 Index Portfolio Administrator..........   25
The Investment Advisers...........................   25
Valuation of Shares...............................   27
About Your Investment
Purchase and Redemption of Shares.................   27
Distributions and Taxes...........................   30
Additional Information
Distribution of Trust Shares......................   31
Master-Feeder Structure...........................   31
Financial Highlights..............................   31
Additional Information...................... Back Cover
</TABLE>

ABOUT THE FUNDS
- ------------------------------------------------------------

OVERVIEW

The American AAdvantage Funds (the "Funds") are managed by AMR Investment
Services, Inc. (the "Manager"), a wholly owned subsidiary of AMR Corporation.

The Funds operate under a master-feeder structure. This means that each Fund,
except for the S&P 500 Index Fund, seeks its investment objective by investing
all of its investable assets in a corresponding Portfolio of the AMR Investment
Services Trust ("AMR Trust") that has a similar name and identical investment
objective. The S&P 500 Index Fund invests all of its investable assets in the
State Street Equity 500 Index Portfolio ("Equity 500 Index Portfolio"), which is
a separate investment company with an identical investment objective, managed by
State Street Bank and Trust Company ("State Street"), through its State Street
Global Advisors division. Throughout this Prospectus, statements regarding
investments by a Fund refer to investments made by its corresponding Portfolio.
For easier reading, the term "Fund" is used throughout the Prospectus to refer
to either a Fund or its Portfolio, unless stated otherwise. See "Master-Feeder
Structure".

- --------------------------------------------------------------------------------

About the Funds                         2                             Prospectus
<PAGE>   5

AMERICAN AADVANTAGE

BALANCED FUND(SM)
- --------------------------------------------------------------------------------

Investment Objective
- -------------------------------

Income and capital appreciation.

Principal Strategies
- ------------------------------

This Fund typically invests between 50% and 65% of its total assets in equity
securities and between 35% and 50% of its total assets in debt securities.

The Fund's equity investments may include common stocks, preferred stocks,
securities convertible into common stocks, and U.S. dollar-denominated American
Depositary Receipts (collectively referred to as "stocks").

The Fund's investment advisers select stocks which, in their opinion, have most
or all of the following characteristics:

- - above-average earnings growth potential,
- - below-average price to earnings ratio,
- - below-average price to book value ratio, and
- - above-average dividend yields.

Each of the Fund's investment advisers determines the earnings growth prospects
of companies based upon a combination of internal and external research using
fundamental analysis and considering changing economic trends. The decision to
sell a stock is typically based on the belief that the company is no longer
considered undervalued or shows deteriorating fundamentals, or that better
investment opportunities exist in other stocks. The Manager believes that this
strategy will help the Fund outperform other investment styles over the longer
term while minimizing volatility and downside risk.

One of the investment advisers utilizes an "amplified alpha" approach in
determining which equity securities to buy and sell. This approach attempts to
amplify the outperformance expected from the best ideas of the other investment
advisers by concentrating assets in those stocks that are overweighted in the
aggregate of the advisers' portfolios when compared to a relevant market index.

The Fund's investments in debt securities may include: obligations of the U.S.
Government, its agencies and instrumentalities; U.S. corporate debt securities,
such as notes and bonds; mortgage-backed securities; asset-backed securities;
master-demand notes; Yankeedollar and Eurodollar bank certificates of deposit,
time deposits, bankers' acceptances, commercial paper and other notes; and other
debt securities. The Fund will only buy debt securities that are investment
grade at the time of purchase. Investment grade securities include securities
issued or guaranteed by the U.S. Government, its agencies and instrumentalities,
as well as securities rated in one of the four highest rating categories by all
nationally recognized statistical rating organizations rating that security
(such as Standard & Poor's Corporation or Moody's Investors Service, Inc.).
Obligations rated in the fourth highest rating category are limited to 25% of
the Fund's total assets. The Fund, at the discretion of the applicable
investment adviser, may retain a security that has been downgraded below the
initial investment criteria.

In determining which debt securities to buy and sell, the investment advisers
generally use a "top-down" or "bottom-up" investment strategy, or a combination
of both strategies.

The top-down fixed income investment strategy is implemented as follows:

- - Develop an overall investment strategy, including a portfolio duration target,
  by examining the current trend in the U.S. economy.
- - Set desired portfolio maturity structure by comparing the differences between
  corporate and U.S. Government securities of similar duration to judge their
  potential for optimal return in accordance with the target duration benchmark.
- - Determine the weightings of each security type by analyzing the difference in
  yield spreads between corporate and U.S. Government securities.
- - Select specific debt securities within each security type.
- - Review and monitor portfolio composition for changes in credit, risk-return
  profile and comparisons with benchmarks.

The bottom-up fixed income investment strategy is implemented as follows:

- - Search for eligible securities with a yield to maturity advantage versus a
  U.S. Government security with a similar maturity.
- - Evaluate credit quality of the securities.
- - Perform an analysis of the expected price volatility of the securities to
  changes in interest rates by examining actual price volatility between U.S.
  Government and non-U.S. Government securities.

Under adverse market conditions, the Fund may, for temporary defensive purposes,
invest up to 100% of its assets in cash or cash equivalents, including
investment grade short-term obligations. To the ex-

- --------------------------------------------------------------------------------

Prospectus                              3                        About the Funds
<PAGE>   6
AMERICAN AADVANTAGE
BALANCED FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

tent that the Fund invokes this strategy, its ability to achieve its investment
objective may be affected adversely.

Risk Factors
- -------------------

MARKET RISK (STOCKS)
Since this Fund invests a substantial portion of its assets in stocks, it is
subject to stock market risk. Market risk involves the possibility that the
value of the Fund's investments in stocks will decline due to drops in the stock
market. In general, the value of the Fund will move in the same direction as the
overall stock market, which will vary from day to day in response to the
activities of individual companies and general market and economic conditions.

INTEREST RATE RISK (BONDS)
The Fund is subject to the risk that the market value of the bonds it holds will
decline due to rising interest rates. When interest rates rise, the price of
most bonds go down. When interest rates go down, bond prices generally go up.
The price of a bond is also affected by its maturity. Bonds with longer
maturities generally have greater sensitivity to changes in interest rates.

CREDIT RISK (BONDS)
The Fund is subject to the risk that the issuer of a bond will fail to make
timely payment of interest or principal. A decline in an issuer's credit rating
can cause its price to go down. This risk is somewhat minimized by the Fund's
policy of only investing in bonds that are considered investment grade at the
time of purchase.

PREPAYMENT RISK (BONDS)
The Fund's investments in asset-backed and mortgage-backed securities are
subject to the risk that the principal amount of the underlying collateral may
be repaid prior to the bond's maturity date. If this occurs, no additional
interest will be paid on the investment and the Fund may have to invest at a
lower rate.

ADDITIONAL RISKS
An investment in the Fund is not a deposit of a bank and is not insured or
guaranteed by the Federal Deposit Insurance Corporation or any other government
agency. The value of an investment in the Fund will fluctuate up and down. When
you sell your shares of the Fund, they could be worth less than what you paid
for them.

Historical Performance
- -----------------------------------

The bar chart and table below provide an indication of risk by showing how the
Fund's performance has varied from year to year. The table shows how the Fund's
performance compares to two broad-based market indices and the Lipper Balanced
Index, a composite of mutual funds with the same investment objective as the
Fund. Past performance is not necessarily indicative of how the Fund will
perform in the future.

                                    [GRAPH]

          TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>
90..........................................................    0.29%
91..........................................................   21.22%
92..........................................................    8.97%
93..........................................................   14.46%
94..........................................................   -1.84%
95..........................................................   28.79%
96..........................................................   13.96%
97..........................................................   19.87%
98..........................................................    8.28%
99..........................................................   -3.59%
</TABLE>

<TABLE>
<S>                              <C>
Highest Quarterly Return:              9.96%
  (1/1/90 through 12/31/99)      (2nd Quarter 1997)
Lowest Quarterly Return:               -7.71%
  (1/1/90 through 12/31/99)      (3rd Quarter 1999)
</TABLE>

<TABLE>
<CAPTION>
                              AVERAGE ANNUAL TOTAL RETURN
                          -----------------------------------
                                    AS OF 12/31/99
                          -----------------------------------
                           1 YEAR      5 YEARS      10 YEARS
                          --------    ---------    ----------
<S>                       <C>         <C>          <C>
BALANCED FUND              -3.59%      12.93%        10.58%
S&P/Barra Value Index(1)   12.72%      22.94%        15.36%
S&P 500 Index(2)           20.99%      28.56%        18.21%
Lehman Bros.
  Intermediate Gov./
  Corp. Index(3)            0.39%       7.09%         7.26%
Lipper Balanced Index       9.00%      16.33%        12.26%
</TABLE>

(1)  The S&P/Barra Value Index is a market value weighted index of stocks with
     book-to-price ratios in the top 50% of the S&P 500 Index.

(2)  The S&P 500 Index is an unmanaged index of common stocks publicly traded in
     the United States.

(3)  The Lehman Brothers Intermediate Gov./Corp. Index is a market value
     weighted performance benchmark for government and corporate fixed-rate debt
     issues with maturities between one and ten years.

- --------------------------------------------------------------------------------

About the Funds                         4                             Prospectus
<PAGE>   7
AMERICAN AADVANTAGE
BALANCED FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

Fees and Expenses
- ----------------------------

This table describes the fees and expenses that you may pay if you buy and hold
shares of the Balanced Fund.(1)

Annual Fund Operating Expenses
(expenses that are deducted from Fund assets)

<TABLE>
<S>                                                    <C>
Management Fees                                        0.30%
Distribution (12b-1) Fees                              0.00
Other Expenses                                         0.29
                                                       ----
TOTAL ANNUAL FUND OPERATING EXPENSES                   0.59%
                                                       ====
</TABLE>

(1)   The expense table and the Example below reflect the expenses of both the
      Fund and its corresponding Portfolio.

<TABLE>
<S> <C>
    Example
    -------------
    This Example is intended to help you compare the
    cost of investing in the Fund with the cost of
    investing in other mutual funds. The Example
    assumes that you invest $10,000 in the Fund for
    the time periods indicated and then redeem all
    of your shares at the end of those periods. The
    Example also assumes that your investment has a
    5% return each year and that the Fund's
    operating expenses remain the same. Although
    your actual costs may be higher or lower, based
    on these assumptions your costs would be:
    1 YEAR ......................................$60
    3 YEARS.....................................$189
    5 YEARS.....................................$329
    10 YEARS....................................$738
</TABLE>

Investment Advisers
- ----------------------------------

The Manager allocates the assets of the Fund among the following investment
advisers:

Barrow, Hanley, Mewhinney & Strauss, Inc.

Brandywine Asset Management, Inc.

Hotchkis and Wiley

Independence Investment Associates, Inc.

- --------------------------------------------------------------------------------

Prospectus                              5                        About the Funds
<PAGE>   8

AMERICAN AADVANTAGE

LARGE CAP VALUE FUND(SM)
- --------------------------------------------------------------------------------

Investment Objective
- -------------------------------

Long-term capital appreciation and current income.

Principal Strategies
- ------------------------------

Ordinarily at least 65% of the total assets of this Fund are invested in equity
securities of U.S. companies with market capitalizations of $5 billion or more
at the time of investment. The Fund's investments may include common stocks,
preferred stocks, securities convertible into U.S. common stocks, and U.S.
dollar-denominated American Depositary Receipts (collectively referred to as
"stocks").

The Fund's investment advisers select stocks which, in their opinion, have most
or all of the following characteristics:

- - above-average earnings growth potential,
- - below-average price to earnings ratio,
- - below-average price to book value ratio, and
- - above-average dividend yields.

Each of the Fund's investment advisers determines the earnings growth prospects
of companies based upon a combination of internal and external research using
fundamental analysis and considering changing economic trends. The decision to
sell a stock is typically based on the belief that the company is no longer
considered undervalued or shows deteriorating fundamentals, or that better
investment opportunities exist in other stocks. The Manager believes that this
strategy will help the Fund outperform other investment styles over the longer
term while minimizing volatility and downside risk.

One of the investment advisers utilizes an "amplified alpha" approach in
determining which equity securities to buy and sell. This approach attempts to
amplify the outperformance expected from the best ideas of the other investment
advisers by concentrating assets in those stocks that are overweighted in the
aggregate of the advisers' portfolios when compared to a relevant market index.

Under adverse market conditions, the Fund may, for temporary defensive purposes,
invest up to 100% of its assets in cash or cash equivalents, including
investment grade short-term obligations. To the extent that the Fund invokes
this strategy, its ability to achieve its investment objective may be affected
adversely.

Risk Factors
- -------------------

MARKET RISK
Since this Fund invests most of its assets in stocks, it is subject to stock
market risk. Market risk involves the possibility that the value of the Fund's
investments in stocks will decline due to drops in the stock market. In general,
the value of the Fund will move in the same direction as the overall stock
market, which will vary from day to day in response to the activities of
individual companies and general market and economic conditions.

ADDITIONAL RISKS
An investment in the Fund is not a deposit of a bank and is not insured or
guaranteed by the Federal Deposit Insurance Corporation or any other government
agency. The value of an investment in the Fund will fluctuate up and down. When
you sell your shares of the Fund, they could be worth less than what you paid
for them.

Historical Performance
- -----------------------------------

The bar chart and table below provide an indication of risk by showing how the
Fund's performance has varied from year to year. The table shows how the Fund's
performance compares to the S&P/Barra Value Index, a market value weighted index
of stocks with book-to-price ratios in the top 50% of the S&P 500 Index; the S&P
500 Index, a widely recognized unmanaged index of common stocks publicly traded
in the U.S.; and the Lipper Multi-Cap Value Index, a composite of mutual funds
with the same investment objective as the Fund. Past performance is not
necessarily indicative of how the Fund will perform in the future.

                                    [GRAPH]

          TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>
90..........................................................   -5.97%
91..........................................................   26.00%
92..........................................................   11.90%
93..........................................................   15.74%
94..........................................................   -1.14%
95..........................................................   34.43%
96..........................................................   21.09%
97..........................................................   26.48%
98..........................................................    6.17%
99..........................................................   -4.62%
</TABLE>

- --------------------------------------------------------------------------------

About the Funds                         6                             Prospectus
<PAGE>   9
AMERICAN AADVANTAGE
LARGE CAP VALUE FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

<TABLE>
<S>                              <C>
Highest Quarterly Return:              14.13%
  (1/1/90 through 12/31/99)      (2nd Quarter 1997)
Lowest Quarterly Return:              -14.03%
  (1/1/90 through 12/31/99)      (3rd Quarter 1998)
</TABLE>

<TABLE>
<CAPTION>
                                   AVERAGE ANNUAL TOTAL
                                          RETURN
                               ----------------------------
                                      AS OF 12/31/99
                               ----------------------------
                               1 YEAR   5 YEARS    10 YEARS
                               ------   --------   --------
<S>                            <C>      <C>        <C>
LARGE CAP VALUE FUND           -4.62%    15.83%     12.21%
S&P/Barra Value Index          12.72%    22.94%     15.36%
S&P 500 Index                  20.99%    28.56%     18.21%
Lipper Multi-Cap Value
  Index(1)                      5.94%    17.82%     13.03%
</TABLE>

(1)   On September 1, 1999, Lipper reclassified the Fund from the Lipper Growth
      and Income Index to the Lipper Multi-Cap Value Index.

Fees and Expenses
- ----------------------------

This table describes the fees and expenses that you may pay if you buy and hold
shares of the Large Cap Value Fund.(1)

Annual Fund Operating Expenses
(expenses that are deducted from Fund assets)

<TABLE>
<S>                                                    <C>
Management Fees                                        0.30%
Distribution (12b-1) Fees                              0.00
Other Expenses                                         0.29
                                                       ----
TOTAL ANNUAL FUND OPERATING EXPENSES                   0.59%
                                                       ====
</TABLE>

(1)   The expense table and the Example below reflect the expenses of both the
      Fund and its corresponding Portfolio.

Example
- -------------
This Example is intended to help you compare the cost of investing in the Fund
with the cost of investing in other mutual funds. The Example assumes that you
invest $10,000 in the Fund for the time periods indicated and then redeem all of
your shares at the end of those periods. The Example also assumes that your
investment has a 5% return each year and that the Fund's operating expenses
remain the same. Although your actual costs may be higher or lower, based on
these assumptions your costs would be:

<TABLE>
<S> <C>                                              <C>
    1 YEAR ......................................$60
    3 YEARS.....................................$189
    5 YEARS.....................................$329
    10 YEARS....................................$738
</TABLE>

Investment Advisers
- ------------------------------

The Manager allocates the assets of the Fund among the following investment
advisers:

Barrow, Hanley, Mewhinney & Strauss, Inc.

Brandywine Asset Management, Inc.

Hotchkis and Wiley

Independence Investment Associates, Inc.

- --------------------------------------------------------------------------------

Prospectus                              7                        About the Funds
<PAGE>   10

AMERICAN AADVANTAGE

SMALL CAP VALUE FUND(SM)
- --------------------------------------------------------------------------------

Investment Objective
- -------------------------------

Long-term capital appreciation and current income.

Principal Strategies
- ------------------------------

Ordinarily, at least 80% of the total assets of the Fund are invested in equity
securities of U.S. companies with market capitalizations of $1 billion or less
at the time of investment. The Fund's investments may include common stocks,
preferred stocks, securities convertible into common stocks, and U.S.
dollar-denominated American Depositary Receipts (collectively, "stocks").

The investment advisers select stocks which, in their opinion, have most or all
of the following characteristics:

- - above-average earnings growth potential,
- - below-average price to earnings ratio,
- - below-average price to book value ratio, and
- - above-average dividend yields.

Each of the investment advisers determines the earnings growth prospects of
companies based upon a combination of internal and external research using
fundamental analysis and considering changing economic trends. The decision to
sell a stock is typically based on the belief that the company is no longer
considered undervalued or shows deteriorating fundamentals, or that better
investment opportunities exist in other stocks. The Manager believes that this
strategy will help the Fund outperform other investment styles over the longer
term while minimizing volatility and downside risk.

Under adverse market conditions, the Fund may, for temporary defensive purposes,
invest up to 100% of its assets in cash or cash equivalents, including
investment grade short-term obligations. To the extent that the Fund invokes
this strategy, its ability to achieve its investment objective may be affected
adversely.

Risk Factors
- -------------------

MARKET RISK
Since this Fund invests most of its assets in stocks, it is subject to stock
market risk. Market risk involves the possibility that the value of the Fund's
investments in stocks will decline due to drops in the stock market. In general,
the value of the Fund will move in the same direction as the overall stock
market, which will vary from day to day in response to the activities of
individual companies and general market and economic conditions.

SMALL CAPITALIZATION COMPANIES
Investing in the securities of small capitalization companies involves greater
risk and the possibility of greater price volatility than investing in larger
capitalization and more established companies, since smaller companies may have
limited operating history, product lines, and financial resources, and the
securities of these companies may lack sufficient market liquidity.

ADDITIONAL RISKS
An investment in the Fund is not a deposit of a bank and is not insured or
guaranteed by the Federal Deposit Insurance Corporation or any other government
agency. The value of an investment in the Fund will fluctuate up and down. When
you sell your shares of the Fund, they could be worth less than what you paid
for them.

Historical Performance
- -----------------------------------

The bar chart and table below provide an indication of risk by showing how the
Fund has performed during the past year. The table shows how the Fund's
performance compares to the Russell 2000(R) Value Index, an unmanaged index of
those stocks in the Russell 2000 Index with below-average price-to-book ratios
and below-average forecasted growth values, and the Lipper Small Cap Value
Index, a composite of mutual funds with the same investment objective as the
Fund. Past performance is not necessarily indicative of how the Fund will
perform in the future.
                                    [GRAPH]

               TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31/99

<TABLE>
<S>                                                           <C>
99..........................................................   -4.79%
</TABLE>

<TABLE>
<S>                              <C>
Highest Quarterly Return:              19.89%
  (1/1/99 through 12/31/99)      (2nd Quarter 1999)
Lowest Quarterly Return:              -11.37%
  (1/1/99 through 12/31/99)      (3rd Quarter 1999)
</TABLE>

- --------------------------------------------------------------------------------

About the Funds                         8                             Prospectus
<PAGE>   11
AMERICAN AADVANTAGE
SMALL CAP VALUE FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                               AVERAGE ANNUAL TOTAL RETURN
                               ---------------------------
                                     AS OF 12/31/99
                               ---------------------------
                                         1 YEAR
                               ---------------------------
<S>                            <C>
SMALL CAP VALUE FUND                     -4.79%
Russell 2000 Value Index                 -1.49%
Lipper Small Cap Value Index              1.31%
</TABLE>

Fees and Expenses
- ----------------------------

This table describes the fees and expenses that you may pay if you buy and hold
shares of the Small Cap Value Fund.(1)

Annual Fund Operating Expenses
(expenses that are deducted from Fund assets)

<TABLE>
<S>                                                    <C>
Management Fees                                        0.67%
Distribution (12b-1) Fees                              0.00
Other Expenses                                         1.52
                                                       ----
Total Annual Fund Operating Expenses                   2.19%
                                                       ====
Fee Waiver and/or Expense Reimbursement                1.20%(2)
NET EXPENSES                                           0.99%
</TABLE>

(1)   The expense table and the Example below reflect the expenses of both the
      Fund and its corresponding Portfolio.

(2)   The Manager has contractually agreed to reimburse the Fund for Other
      Expenses through October 31, 2000 to the extent that Total Annual Fund
      Operating Expenses exceed 0.99%.

Example
- -------------
This Example is intended to help you compare the cost of investing in the Fund
with the cost of investing in other mutual funds. The Example assumes that you
invest $10,000 in the Fund for the time periods indicated and then redeem all of
your shares at the end of those periods. The Example also assumes that your
investment has a 5% return each year and that the Fund's operating expenses
remain the same. Because the Manager's expense reimbursement is only guaranteed
through October 31, 2000, net expenses are used to calculate costs in year one,
and total fund expenses are used to calculate costs in years two through ten.
Although your actual costs may be higher or lower, based on these assumptions
your costs would be:

<TABLE>
<S> <C>                                              <C>
    1 YEAR .....................................$101
    3 YEARS.....................................$332
    5 YEARS...................................$1,065
    10 YEARS..................................$2,429
</TABLE>

Investment Advisers
- ------------------------------

The Manager allocates the assets of the Fund among the following investment
advisers:

Brandywine Asset Management, Inc.

Hotchkis and Wiley

- --------------------------------------------------------------------------------

Prospectus                              9                        About the Funds
<PAGE>   12

AMERICAN AADVANTAGE

INTERNATIONAL EQUITY FUND(SM)
- --------------------------------------------------------------------------------

Investment Objective
- -------------------------------

Long-term capital appreciation.

Principal Strategies
- ------------------------------

Under normal circumstances, at least 80% of the Fund's total assets are invested
in common stocks and securities convertible into common stocks (collectively,
"stocks") of issuers based in at least three different countries located outside
the United States.

The current countries in which the Fund may invest are:

<TABLE>
<S>        <C>        <C>          <C>
Australia  France     Mexico       South Korea
Austria    Germany    Netherlands  Spain
Belgium    Hong Kong  New Zealand  Sweden
Canada     Ireland    Norway       Switzerland
Denmark    Italy      Portugal     United Kingdom
Finland    Japan      Singapore
</TABLE>

The investment advisers select stocks which, in their opinion, have most or all
of the following characteristics:

- - above-average earnings growth potential,
- - below-average price to earnings ratio,
- - below-average price to book value ratio, and
- - above-average dividend yields.

The investment advisers may also consider potential changes in currency exchange
rates when choosing stocks. Each of the investment advisers determines the
earnings growth prospects of companies based upon a combination of internal and
external research using fundamental analysis and considering changing economic
trends. The decision to sell a stock is typically based on the belief that the
company is no longer considered undervalued or shows deteriorating fundamentals,
or that better investment opportunities exist in other stocks. The Manager
believes that this strategy will help the Fund outperform other investment
styles over the longer term while minimizing volatility and downside risk. The
Fund may trade forward foreign currency contracts or currency futures to hedge
currency fluctuations of underlying stock positions when it is believed that a
foreign currency may suffer a decline against the U.S. dollar.

One of the investment advisers utilizes an "amplified alpha" approach in
determining which equity securities to buy and sell. This approach attempts to
amplify the outperformance expected from the best ideas of the other investment
advisers by concentrating assets in those stocks that are overweighted in the
aggregate of the advisers' portfolios when compared to a relevant market index.

Under adverse market conditions, the Fund may, for temporary defensive purposes,
invest up to 100% of its assets in cash or cash equivalents, including
investment grade short-term obligations. To the extent that the Fund invokes
this strategy, its ability to achieve its investment objective may be affected
adversely.

Risk Factors
- -------------------

MARKET RISK
Since this Fund invests most of its assets in stocks, it is subject to stock
market risk. Market risk involves the possibility that the value of the Fund's
investments in stocks of a particular country will decline due to drops in that
country's stock market. In general, the value of the Fund will move in the same
direction as the international stock market it invests in, which will vary from
day to day in response to the activities of individual companies and general
market and economic conditions of that country.

FOREIGN INVESTING
Overseas investing carries potential risks not associated with domestic
investments. Such risks include, but are not limited to: (1) currency exchange
rate fluctuations, (2) political and financial instability, (3) less liquidity
and greater volatility of foreign investments, (4) lack of uniform accounting,
auditing and financial reporting standards, (5) less government regulation and
supervision of foreign stock exchanges, brokers and listed companies, (6)
increased price volatility, (7) delays in transaction settlement in some foreign
markets, and (8) adverse impact of the euro conversion on the business or
financial condition of companies in which the Fund is invested.

ADDITIONAL RISKS
An investment in the Fund is not a deposit of a bank and is not insured or
guaranteed by the Federal Deposit Insurance Corporation or any other government
agency. The value of an investment in the Fund will fluctuate up and down. When
you sell your shares of the Fund, they could be worth less than what you paid
for them.

- --------------------------------------------------------------------------------

About the Funds                        10                             Prospectus
<PAGE>   13
AMERICAN AADVANTAGE
INTERNATIONAL EQUITY FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

Historical Performance
- -----------------------------------

The bar chart and table below provide an indication of risk by showing how the
Fund's performance has varied from year to year. The table shows how the Fund's
performance compares to the Morgan Stanley Europe Australasia Far East ("EAFE")
Index, a widely recognized unmanaged index of international stock investment
performance, and the Lipper International Index, a composite of mutual funds
with the same investment objective as the Fund. Past performance is not
necessarily indicative of how the Fund will perform in the future.

                                    [GRAPH]

TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>
92..........................................................  -11.03%
93..........................................................   42.33%
94..........................................................    0.98%
95..........................................................   17.69%
96..........................................................   19.78%
97..........................................................    9.56%
98..........................................................   11.73%
99..........................................................   26.91%
</TABLE>

<TABLE>
<S>                              <C>
Highest Quarterly Return:              15.19%
  (1/1/92 through 12/31/99)      (4th Quarter 1998)
Lowest Quarterly Return:              -15.60%
  (1/1/92 through 12/31/99)      (3rd Quarter 1998)
</TABLE>

<TABLE>
<CAPTION>
                           AVERAGE ANNUAL TOTAL RETURN
                        ----------------------------------
                                  AS OF 12/31/99
                        ----------------------------------
                                           SINCE INCEPTION
                        1 YEAR   5 YEARS      (8/7/91)
                        ------   -------   ---------------
<S>                     <C>      <C>       <C>
INTERNATIONAL EQUITY
  FUND                  26.91%   16.97%        13.34%
EAFE Index              26.96%   12.83%        11.01%
Lipper International
  Index                 37.83%   15.96%        13.37%
</TABLE>

Fees and Expenses
- ----------------------------

This table describes the fees and expenses that you pay if you buy and hold
shares of the International Equity Fund.(1)

Annual Fund Operating Expenses
(expenses that are deducted from Fund assets)

<TABLE>
<S>                                                      <C>
Management Fees                                          0.36%
Distribution (12b-1) Fees                                0.00
Other Expenses                                           0.36(2)
                                                         ----
TOTAL ANNUAL FUND OPERATING EXPENSES                     0.72%
                                                         ====
</TABLE>

(1)   The expense table and the Example below reflect the expenses of both the
      Fund and its corresponding Portfolio.

(2)   Other Expenses reflects current fees.

Example
- -------------
This Example is intended to help you compare the cost of investing in the Fund
with the cost of investing in other mutual funds. The Example assumes that you
invest $10,000 in the Fund for the time periods indicated and then redeem all of
your shares at the end of those periods. The Example also assumes that your
investment has a 5% return each year and that the Fund's operating expenses
remain the same. Although your actual costs may be higher or lower, based on
these assumptions your costs would be:

<TABLE>
<S> <C>                                              <C>
    1 YEAR ..................................... $74
    3 YEARS.....................................$230
    5 YEARS.....................................$401
    10 YEARS....................................$894
</TABLE>

Investment Advisers
- ------------------------------

The Manager allocates the assets of the Fund among the following investment
advisers:

Hotchkis and Wiley

Independence Investment Associates, Inc.

Lazard Asset Management

Templeton Investment Counsel, Inc.

- --------------------------------------------------------------------------------

Prospectus                             11                        About the Funds
<PAGE>   14

AMERICAN AADVANTAGE

S&P 500 INDEX FUND (1)
- --------------------------------------------------------------------------------

Investment Objective
- -------------------------------

To replicate as closely as possible, before expenses, the performance of the
Standard & Poor's 500 Composite Stock Price Index ("S&P 500 Index" or "Index").

Principal Strategies
- ------------------------------

The Fund uses a passive management strategy designed to track the performance of
the S&P 500 Index. The S&P 500 Index is a well-known stock market index that
includes common stocks of 500 companies from several industrial sectors
representing a significant portion of the market value of all stocks publicly
traded in the United States.

The Fund is not managed according to traditional methods of "active" investment
management, which involve the buying and selling of securities based upon
economic, financial and market analysis and investment judgement. Instead, the
Fund, using a "passive" or "indexing" investment approach, attempts to
replicate, before expenses, the performance of the S&P 500 Index. State Street,
through its State Street Global Advisors division, seeks a correlation of 0.95
or better between the Fund's performance and the performance of the Index; a
figure of 1.00 would represent perfect correlation.

The Fund intends to invest in all 500 stocks comprising the Index in proportion
to their weightings in the Index. However, under various circumstances, it may
not be possible or practicable to purchase all 500 stocks in those weightings.
In those circumstances, the Fund may purchase a sample of the stocks in the
Index in proportions expected by State Street to replicate generally the
performance of the Index as a whole. In addition, from time to time stocks are
added to or removed from the Index. The Fund may sell stocks that are
represented in the Index, or purchase stocks that are not yet represented in the
Index, in anticipation of their removal from or addition to the Index.

In addition, the Fund may at times purchase or sell futures contracts on the
Index, or options on those futures, in lieu of investment directly in the stocks
making up the Index. The Fund might do so, for example, in order to increase its
investment exposure pending investment of cash in the stocks comprising the
Index. Alternatively, the Fund might use futures or options on futures to reduce
its investment exposure in situations where it intends to sell a portion of the
stocks in its portfolio but the sale has not yet been completed. The Fund may
also enter into other derivatives transactions, including the purchase or sale
of options or enter into swap transactions, to assist in replicating the
performance of the Index.

Risk Factors
- -------------------

MARKET RISK
Stock values could decline generally or could underperform other investments. In
addition, returns on investments in stocks of large U.S. companies could trail
the returns on investments in stocks of smaller companies.

TRACKING ERROR RISK
The Fund's return may not match the return of the Index for a number of reasons.
For example, the Fund incurs a number of operating expenses not applicable to
the Index, and incurs costs in buying and selling securities. The Fund may not
be fully invested at times, either as a result of cash flows into the Fund or
reserves of cash held by the fund to meet redemptions. The return on the sample
of stocks purchased by the Fund, or futures or other derivative positions taken
by the Fund, to replicate the performance of the Index may not correlate
precisely with the return on the Index.

DERIVATIVES
The use of these instruments to pursue the S&P 500 Index returns requires
special skills, knowledge and investment techniques that differ from those
required for normal portfolio management. Gains or losses from positions in a
derivative instrument may be much greater than the derivative's original cost.

ADDITIONAL RISKS
An investment in the Fund is not a deposit with a bank and is not insured or
guaranteed by the Federal Deposit Insurance Corporation or any other government
agency. The value of an investment in the Fund

- ---------------

(1)  S&P is a trademark of The McGraw-Hill Companies, Inc. and has been licensed
     for use. "Standard and Poor's(R)," "S&P(R)," "Standard & Poor's 500," "S&P
     500(R)" and "500" are all trademarks of The McGraw-Hill Companies, Inc. and
     have been licensed for use by State Street Bank and Trust Company. The S&P
     500 Index Fund is not sponsored, sold or promoted by Standard & Poor's, and
     Standard & Poor's makes no representation regarding the advisability of
     investing in this Fund.

- --------------------------------------------------------------------------------

About the Funds                        12                             Prospectus
<PAGE>   15
AMERICAN AADVANTAGE
S&P 500 INDEX FUND -- (CONTINUED)
- --------------------------------------------------------------------------------

will fluctuate up and down. When you sell your shares of the Fund, they could be
worth less than what you paid for them.

Historical Performance
- -----------------------------------

The bar chart and table below provide an indication of risk by showing how the
Fund's performance has varied from year to year. The table shows how the Fund's
performance compares to the S&P 500 Index, a widely recognized unmanaged index
of common stocks publicly traded in the U.S., and the Lipper S&P 500 Index, a
composite of funds with the same investment objective as the Fund. The Fund
began offering its shares on January 1, 1997. Prior to March 1, 1998, the Fund's
shares were offered as AMR Class shares. On March 1, 1998, AMR Class shares of
the Fund were designated Institutional Class shares. Prior to March 1, 2000, the
Fund invested all of its investable assets in the BT Equity 500 Index Portfolio,
a separate investment company managed by Bankers Trust Company. Past performance
is not necessarily indicative of how the Fund will perform in the future.

                                    [GRAPH]

TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>
97..........................................................   33.09%
98..........................................................   28.87%
99..........................................................   20.70%
</TABLE>

<TABLE>
<S>                              <C>
Highest Quarterly Return:              21.32%
  (1/1/97 through 12/31/99)      (4th Quarter 1998)
Lowest Quarterly Return:               -9.69%
  (1/1/97 through 12/31/99)      (3rd Quarter 1998)
</TABLE>

<TABLE>
<CAPTION>
                                         AVERAGE ANNUAL
                                          TOTAL RETURN
                                    ------------------------
                                         AS OF 12/31/99
                                    ------------------------
                                             SINCE INCEPTION
                                    1 YEAR     (12/31/96)
                                    ------   ---------------
<S>                                 <C>      <C>
S&P 500 INDEX FUND                  20.70%       27.45%
S&P 500 Index                       20.99%       27.56%
Lipper S&P 500 Index                20.62%       27.24%
</TABLE>

Fees and Expenses
- ----------------------------

This table describes the fees and expenses that you may pay if you buy and hold
shares of the S&P 500 Index Fund.(1)

Annual Fund Operating Expenses
(expenses that are deducted from Fund assets)

<TABLE>
<S>                                                  <C>
Management Fees                                      0.045%(2)
Distribution (12b-1) Fees                            0.000
Other Expenses                                       0.105
                                                     -----
TOTAL ANNUAL FUND OPERATING EXPENSES                 0.150%
                                                     =====
</TABLE>

(1)   The expense table and the Example below reflect the expenses of both the
      Fund and the Portfolio.

(2)   Management Fees reflects current fees.

<TABLE>
<S> <C>                                              <C>
    Example
    -------------
    This Example is intended to help you compare the
    cost of investing in the Fund with the cost of
    investing in other mutual funds. The Example
    assumes that you invest $10,000 in the Fund for
    the time periods indicated and then redeem all
    of your shares at the end of those periods. The
    Example also assumes that your investment has a
    5% return each year and that the Fund's
    operating expenses remain the same. Although
    your actual costs may be higher or lower, based
    on these assumptions your costs would be:
    1 YEAR ......................................$15
    3 YEARS......................................$48
    5 YEARS......................................$85
    10 YEARS....................................$192
</TABLE>

Investment Adviser
- -----------------------------

State Street Bank and Trust Company

- --------------------------------------------------------------------------------

Prospectus                             13                        About the Funds
<PAGE>   16

AMERICAN AADVANTAGE

INTERMEDIATE BOND FUND(SM)
- --------------------------------------------------------------------------------

Investment Objective
- -------------------------------

Income and capital appreciation.

Principal Strategies
- ------------------------------

The Fund invests in obligations of the U.S. Government, its agencies and
instrumentalities; corporate debt securities, such as commercial paper, master
demand notes, loan participation interests, medium-term notes and funding
agreements; mortgage-backed securities; asset-backed securities; and
Yankeedollar and Eurodollar bank certificates of deposit, time deposits,
bankers' acceptances and other notes. As an investment policy, the Fund
primarily seeks income and secondarily seeks capital appreciation. The Fund
seeks capital appreciation by investing in corporate issues whose relative value
is expected to increase over time.

The Fund will only buy debt securities that are investment grade at the time of
purchase. Investment grade securities include securities issued or guaranteed by
the U.S. Government, its agencies and instrumentalities, as well as securities
rated in one of the four highest rating categories by all rating organizations
rating the securities (such as Standard & Poor's Corporation or Moody's
Investors Service, Inc.). No more than 25% of total assets may be invested in
securities rated in the fourth highest rating category. The Fund, at the
discretion of the applicable investment adviser, may retain a security that has
been downgraded below the initial investment criteria.

In determining which securities to buy and sell, the Manager employs a top-down
fixed income investment strategy, as follows:

- - Develop an overall investment strategy, including a portfolio duration target,
  by examining the current trend in the U.S. economy.
- - Set desired portfolio maturity structure by comparing the differences between
  corporate and U.S. Government securities of similar duration to judge their
  potential for optimal return in accordance with the target duration benchmark.
- - Determine the weightings of each security type by analyzing the difference in
  yield spreads between corporate and U.S. Government securities.
- - Select specific debt securities within each security type.
- - Review and monitor portfolio composition for changes in credit, risk-return
  profile and comparisons with benchmarks.

The other investment adviser to the Fund uses a bottom-up fixed income
investment strategy in determining which securities to buy and sell, as follows:

- - Search for eligible securities with a yield to maturity advantage versus a
  U.S. Government security with a similar maturity.
- - Evaluate credit quality of the securities.
- - Perform an analysis of the expected price volatility of the securities to
  changes in interest rates by examining actual price volatility between U.S.
  Government and non-U.S. Government securities.

Under normal circumstances, the Fund seeks to maintain a duration of three to
seven years. Duration is a measure of price sensitivity relative to changes in
interest rates. Portfolios with longer durations are typically more sensitive to
changes in interest rates. Under adverse market conditions, the Fund may, for
temporary defensive purposes, invest up to 100% of its assets in cash or cash
equivalents, including investment grade short-term debt obligations. To the
extent that the Fund invokes this strategy, its ability to achieve its
investment objective may be affected adversely.

Risk Factors
- -------------------

INTEREST RATE RISK
The Fund is subject to the risk that the market value of the bonds it holds will
decline due to rising interest rates. When interest rates rise, the price of
most bonds go down. When interest rates go down, bond prices generally go up.
The price of a bond is also affected by its maturity. Bonds with longer
maturities generally have greater sensitivity to changes in interest rates.

CREDIT RISK
The Fund is subject to the risk that the issuer of a bond will fail to make
timely payment of interest or principal. A decline in an issuer's credit rating
can cause its price to go down. This risk is somewhat minimized by the Fund's
policy of only investing in bonds that are considered investment grade at the
time of purchase.

- --------------------------------------------------------------------------------

About the Funds                        14                             Prospectus
<PAGE>   17
AMERICAN AADVANTAGE
INTERMEDIATE BOND FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

PREPAYMENT RISK
The Fund's investments in asset-backed and mortgage-backed securities are
subject to the risk that the principal amount of the underlying collateral may
be repaid prior to the bond's maturity date. If this occurs, no additional
interest will be paid on the investment and the Fund may have to invest at a
lower rate.

ADDITIONAL RISKS
An investment in the Fund is not a deposit of a bank and is not insured or
guaranteed by the Federal Deposit Insurance Corporation or any other government
agency. The value of an investment in the Fund will fluctuate up and down. When
you sell your shares of the Fund, they could be worth less than what you paid
for them.

Historical Performance
- -----------------------------------

The bar chart and table below provide an indication of risk by showing how the
Fund has performed during the past two years. The table shows how the Fund's
performance compares to the Lehman Brothers Intermediate Gov./Corp. and
Aggregate Indexes, two broad-based market indices, and the Lipper Intermediate
Investment Grade Debt Average and Index, composites of mutual funds with the
same investment objective as the Fund. Past performance is not necessarily
indicative of how the Fund will perform in the future.

                                    [GRAPH]

          TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>
98..........................................................   8.57%
99..........................................................  -2.15%
</TABLE>

<TABLE>
<S>                               <C>
Highest Quarterly Return:               4.62%
  (1/1/98 through 12/31/99)       (3rd Quarter 1998)
Lowest Quarterly Return:                -1.26%
  (1/1/98 through 12/31/99)       (2nd Quarter 1999)
</TABLE>

<TABLE>
<CAPTION>
                                        AVERAGE ANNUAL
                                         TOTAL RETURN
                                   ------------------------
                                        AS OF 12/31/99
                                   ------------------------
                                            SINCE INCEPTION
                                   1 YEAR      (9/15/97)
                                   ------   ---------------
<S>                                <C>      <C>
INTERMEDIATE BOND FUND             -2.15%        4.56%
Lehman Bros. Aggregate Index(2)    -0.83%     5.21%(1)
Lehman Bros. Intermediate           0.39%     5.16%(1)
  Gov./Corp. Index(3)
Lipper Intermediate Investment     -1.00%     4.40%(1)
  Grade Debt Index(4)
Lipper Intermediate Investment     -1.31%     4.16%(1)
  Grade Debt Average
</TABLE>

(1)   The Since Inception return is shown from 8/31/97.

(2)   The Lehman Brothers Aggregate Index is a market value weighted performance
      benchmark for government, corporate, mortgage-backed and asset-backed
      fixed-rate debt securities of all maturities. As of March 1, 2000, this
      Index has replaced the Lehman Bros. Intermediate Gov./Corp. Index as the
      Fund's market index, because it better reflects the principal strategies
      of the Fund.

(3)   The Lehman Bros. Intermediate Gov./Corp. Index is a market value weighted
      performance benchmark for government and corporate fixed-rate debt
      securities with maturities between one and ten years.

(4)   As of March 1, 2000, the Fund's investment advisers have designated this
      Index of 30 funds as the Fund's performance benchmark, replacing the
      Lipper Intermediate Investment Grade Debt Average.

Fees and Expenses
- ----------------------------

This table describes the fees and expenses that you may pay if you buy and hold
shares of the Intermediate Bond Fund.(1)

Annual Fund Operating Expenses
(expenses that are deducted from Fund assets)

<TABLE>
<S>                                                    <C>
Management Fees                                        0.25%
Distribution (12b-1) Fees                              0.00
Other Expenses                                         0.30
                                                       ----
TOTAL ANNUAL FUND OPERATING EXPENSES                   0.55%
                                                       ====
</TABLE>

(1)   The expense table and the Example below reflect the expenses of both the
      Fund and its corresponding Portfolio.

- --------------------------------------------------------------------------------

Prospectus                             15                        About the Funds
<PAGE>   18
AMERICAN AADVANTAGE
INTERMEDIATE BOND FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

<TABLE>
<S> <C>                                              <C>
    Example
    -------------
    This Example is intended to help you compare the
    cost of investing in the Fund with the cost of
    investing in other mutual funds. The Example
    assumes that you invest $10,000 in the Fund for
    the time periods indicated and then redeem all
    of your shares at the end of those periods. The
    Example also assumes that your investment has a
    5% return each year and that the Fund's
    operating expenses remain the same. Although
    your actual costs may be higher or lower, based
    on these assumptions your costs would be:
    1 YEAR ......................................$56
    3 YEARS.....................................$176
    5 YEARS.....................................$307
    10 YEARS....................................$689
</TABLE>

Investment Advisers
- ------------------------------

The Manager allocates the assets of the Fund among the following investment
advisers:

AMR Investment Services, Inc.

Barrow, Hanley, Mewhinney & Strauss, Inc.

- --------------------------------------------------------------------------------

About the Funds                        16                             Prospectus
<PAGE>   19

AMERICAN AADVANTAGE

SHORT-TERM BOND FUND(SM)
- --------------------------------------------------------------------------------

Investment Objective
- -------------------------------

Income and capital appreciation.

Principal Strategies
- ------------------------------

The Fund invests in obligations of the U.S. Government, its agencies and
instrumentalities; corporate debt securities, such as commercial paper, master
demand notes, loan participation interests, medium-term notes and funding
agreements; mortgage-backed securities; asset-backed securities; and
Yankeedollar and Eurodollar bank certificates of deposit, time deposits,
bankers' acceptances and other notes. As an investment policy, the Fund
primarily seeks income and secondarily seeks capital appreciation. The Fund
seeks capital appreciation by investing in corporate issues whose relative value
is expected to increase over time.

The Fund will only buy debt securities that are investment grade at the time of
purchase. Investment grade securities include securities issued or guaranteed by
the U.S. Government, its agencies and instrumentalities, as well as securities
rated in one of the four highest rating categories by all rating organizations
rating the securities (such as Standard & Poor's Corporation or Moody's
Investors Service, Inc.). No more than 25% of total assets may be invested in
securities rated in the fourth highest rating category. The Fund, at the
discretion of the investment advisers, may retain a security that has been
downgraded below the initial investment criteria.

In determining which securities to buy and sell, the Manager employs a top-down
fixed income investment strategy, as follows:

- - Develop an overall investment strategy, including a portfolio duration target,
  by examining the current trend in the U.S. economy.
- - Set desired portfolio maturity structure by comparing the differences between
  corporate and U.S. Government securities of similar duration to judge their
  potential for optimal return in accordance with the target duration benchmark.
- - Determine the weightings of each security type by analyzing the difference in
  yield spreads between corporate and U.S. Government securities.
- - Select specific debt securities within each security type.
- - Review and monitor portfolio composition for changes in credit, risk-return
  profile and comparisons with benchmarks.

Under normal circumstances, the Fund seeks to maintain a duration of one to
three years. Duration is a measure of price sensitivity relative to changes in
interest rates. Portfolios with longer durations are typically more sensitive to
changes in interest rates. Under adverse market conditions, the Fund may, for
temporary defensive purposes, invest up to 100% of its assets in cash or cash
equivalents, including investment grade short-term debt obligations. To the
extent that the Fund invokes this strategy, its ability to achieve its
investment objective may be affected adversely.

Risk Factors
- -------------------

INTEREST RATE RISK
The Fund is subject to the risk that the market value of the bonds it holds will
decline due to rising interest rates. When interest rates rise, the price of
most bonds go down. When interest rates go down, bond prices generally go up.
The price of a bond is also affected by its maturity. Bonds with longer
maturities generally have greater sensitivity to changes in interest rates.

CREDIT RISK
The Fund is subject to the risk that the issuer of a bond will fail to make
timely payment of interest or principal. A decline in an issuer's credit rating
can cause its price to go down. This risk is somewhat minimized by the Fund's
policy of only investing in bonds that are considered investment grade at the
time of purchase.

PREPAYMENT RISK
The Fund's investments in mortgage-backed securities are subject to the risk
that the principal amount of the underlying mortgage may be repaid prior to the
bond's maturity date. If this occurs, no additional interest will be paid on the
investment and the Fund may have to invest at a lower rate.

ADDITIONAL RISKS
An investment in the Fund is not a deposit of a bank and is not insured or
guaranteed by the Federal Deposit Insurance Corporation or any other government
agency. The value of an investment in the Fund will fluctuate up and down. When
you sell your shares of the Fund, they could be worth less than what you paid
for them.

- --------------------------------------------------------------------------------

Prospectus                             17                        About the Funds
<PAGE>   20
AMERICAN AADVANTAGE
SHORT-TERM BOND FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

Historical Performance
- -----------------------------------

The bar chart and table below provide an indication of risk by showing how the
Fund's performance has varied from year to year. The table shows how the Fund's
performance compares to the Lehman Brothers Intermediate Gov./Corp. and Merrill
Lynch 1-3 Year Gov./Corp. Indexes, two broad-based market indices, and the
Linked Lipper Investment Grade Debt Averages, a composite of mutual funds with
the same investment objective as the Fund. Past performance is not necessarily
indicative of how the Fund will perform in the future.

                                    [GRAPH]

          TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>
90..........................................................    8.47%
91..........................................................   12.97%
92..........................................................    5.19%
93..........................................................    6.50%
94..........................................................    1.15%
95..........................................................    9.90%
96..........................................................    3.76%
97..........................................................    6.71%
98..........................................................    5.30%
99..........................................................    2.92%
</TABLE>

<TABLE>
<S>                                     <C>
Highest Quarterly Return:                     4.66%
  (1/1/90 through 12/31/99)             (4th Quarter 1991)
Lowest Quarterly Return:                      -0.63%
  (1/1/90 through 12/31/99)             (1st Quarter 1996)
</TABLE>

<TABLE>
<CAPTION>
                                   AVERAGE ANNUAL TOTAL
                                          RETURN
                                ---------------------------
                                      AS OF 12/31/99
                                ---------------------------
                                1 YEAR   5 YEARS   10 YEARS
                                ------   -------   --------
<S>                             <C>      <C>       <C>
SHORT-TERM BOND FUND             2.92%     5.69%     6.24%
Merrill Lynch 1-3 Yr Gov./
  Corp. Index(1)                 3.25%     6.59%     6.68%
Lehman Bros. Intermediate
  Gov./Corp. Index(2)            0.39%     7.09%     7.26%
Linked Lipper Investment Grade
  Debt Averages(3)               2.79%     5.74%     6.00%
</TABLE>

(1) The Merrill Lynch 1-3 Year Gov./Corp. Index is a market value weighted
    performance benchmark for government and corporate fixed-rate debt
    securities with maturities between one and three years. As of March 1, 2000,
    the Manager replaced the Lehman Bros. Intermediate Gov./Corp. Index with
    this Index, because it better reflects the duration of the Fund.

(2) The Lehman Bros. Intermediate Gov./Corp. Index is a market value weighted
    performance benchmark for government and corporate fixed-rate debt
    securities with maturities between one and ten years.

(3) The Linked Lipper Investment Grade Debt Averages includes the Lipper
    Short-Term Investment Grade Debt Average prior to 1/1/96, the Lipper
    Short-Intermediate Investment Grade Debt Average from 1/1/96 through 7/31/96
    and the Lipper Short-Term Investment Grade Debt Average since 8/1/96.

Fees and Expenses
- ----------------------------

This table describes the fees and expenses that you may pay if you buy and hold
shares of the Short-Term Bond Fund.(1)

Annual Fund Operating Expenses
(expenses that are deducted from Fund assets)

<TABLE>
<S>                                                   <C>
Management Fees                                        0.25%
Distribution (12b-1) Fees                              0.00
Other Expenses                                         0.37
                                                      -----
TOTAL ANNUAL FUND OPERATING EXPENSES                   0.62%
                                                      =====
</TABLE>

(1)   The expense table and the Example below reflect the expenses of both the
      Fund and its corresponding Portfolio.

<TABLE>
<S> <C>                                              <C>
    Example
    -------------
This Example is intended to help you compare the cost of
investing in the Fund with the cost of investing in
other mutual funds. The Example assumes that you invest
$10,000 in the Fund for the time periods indicated and
then redeem all of your shares at the end of those
periods. The Example also assumes that your investment
has a 5% return each year and that the Fund's operating
expenses remain the same. Although your actual costs may
be higher or lower, based on these assumptions your
costs would be:
1 YEAR ..............................................$63
3 YEARS.............................................$199
5 YEARS.............................................$346
10 YEARS............................................$774
</TABLE>

Investment Adviser
- -----------------------------

AMR Investment Services, Inc.

- --------------------------------------------------------------------------------

About the Funds                        18                             Prospectus
<PAGE>   21

AMERICAN AADVANTAGE

MONEY MARKET FUND(SM)
- --------------------------------------------------------------------------------

Investment Objective
- -------------------------------

Current income, liquidity and the maintenance of a stable price of $1.00 per
share.

Principal Strategies
- ------------------------------

The Fund invests exclusively in high quality variable or fixed rate, U.S. dollar
denominated short-term money market instruments. These securities may include
obligations of the U.S. Government, its agencies and instrumentalities;
corporate debt securities, such as commercial paper, master demand notes, loan
participation interests, medium-term notes and funding agreements; Yankeedollar
and Eurodollar bank certificates of deposit, time deposits, and bankers'
acceptances; asset-backed securities; and repurchase agreements involving the
foregoing obligations.

The Fund will only buy securities with the following credit qualities:

- - rated in the highest short-term categories by two rating organizations, such
  as "A-1" by Standard & Poor's Corporation and "P-1" by Moody's Investors
  Service, Inc., at the time of purchase.
- - rated in the highest short-term category by one rating organization if the
  securities are rated only by one rating organization, or
- - unrated securities that are determined to be of equivalent quality by the
  Manager pursuant to guidelines approved by the Board of Trustees.

The Fund invests more than 25% of its total assets in obligations issued by the
banking industry. However, for temporary defensive purposes when the Manager
believes that maintaining this concentration may be inconsistent with the best
interests of shareholders, the Fund may not maintain this concentration.

Securities purchased by the Fund generally have remaining maturities of 397 days
or less, although instruments subject to repurchase agreements and certain
variable and floating rate obligations may bear longer final maturities. The
average dollar-weighted maturity of the Fund will not exceed 90 days.

Risk Factors
- -------------------

- - The yield paid by the Fund is subject to changes in interest rates. As a
  result, there is risk that a decline in short-term interest rates would lower
  its yield and the overall return on your investment.
- - Although the Fund seeks to preserve the value of your investment at $1.00 per
  share, it is possible to lose money by investing in the Fund.
- - As with any money market fund, there is the risk that the issuers or
  guarantors of securities owned by the Fund will default on the payment of
  principal or interest or the obligation to repurchase securities from the
  Fund.

Your investment in the Fund is not insured or guaranteed by the U.S. Government
or any financial or government institution.

Historical Performance
- -----------------------------------

The bar chart and table below provide an indication of risk by showing how the
Fund's performance has varied from year to year. Past performance is not
necessarily indicative of how the Fund will perform in the future. You may call
1-800-388-3344 to obtain the Fund's current seven-day yield.

                                    [GRAPH]

          TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>
90..........................................................    8.40%
91..........................................................    6.77%
92..........................................................    4.02%
93..........................................................    3.28%
94..........................................................    4.22%
95..........................................................    6.04%
96..........................................................    5.50%
97..........................................................    5.64%
98..........................................................    5.56%
99..........................................................    5.18%
</TABLE>

<TABLE>
<S>                           <C>
 Highest Quarterly Return:               2.06%
 (1/1/90 through 12/31/99)         (2nd Quarter 1990)
  Lowest Quarterly Return:               0.80%
 (1/1/90 through 12/31/99)      (2nd & 4th Quarter 1993,
                                   1st Quarter 1994)
</TABLE>

- --------------------------------------------------------------------------------

Prospectus                             19                        About the Funds
<PAGE>   22
AMERICAN AADVANTAGE
MONEY MARKET FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
AVERAGE ANNUAL TOTAL RETURN
- ---------------------------
      AS OF 12/31/99
- ---------------------------
1 YEAR   5 YEARS   10 YEARS
- ------   -------   --------
<S>      <C>       <C>
5.18%     5.58%     5.45%
</TABLE>

Fees and Expenses
- ----------------------------

This table describes the fees and expenses that you may pay if you buy and hold
shares of the Money Market Fund.(1)

Annual Fund Operating Expenses
(expenses that are deducted from Fund assets)

<TABLE>
<S>                                                   <C>
Management Fees                                       0.10%
Distribution (12b-1) Fees                             0.00
Other Expenses                                        0.14
                                                      ----
TOTAL ANNUAL FUND OPERATING EXPENSES                  0.24%
                                                      ====
</TABLE>

(1)   The expense table and the Example below reflect the expenses of both the
      Fund and its corresponding Portfolio.

<TABLE>
<S> <C>                                              <C>
    Example
    -------------
    This Example is intended to help you compare the
    cost of investing in the Fund with the cost of
    investing in other mutual funds. The Example
    assumes that you invest $10,000 in the Fund for
    the time periods indicated and then redeem all
    of your shares at the end of those periods. The
    Example also assumes that your investment has a
    5% return each year and that the Fund's
    operating expenses remain the same. Although
    your actual costs may be higher or lower, based
    on these assumptions your costs would be:
    1 YEAR ......................................$25
    3 YEARS......................................$77
    5 YEARS.....................................$135
    10 YEARS....................................$306
</TABLE>

Investment Adviser
- -----------------------------

AMR Investment Services, Inc.

- --------------------------------------------------------------------------------

About the Funds                        20                             Prospectus
<PAGE>   23

AMERICAN AADVANTAGE
U.S. GOVERNMENT MONEY MARKET FUND(SM)
- --------------------------------------------------------------------------------

Investment Objective
- -------------------------------

Current income, liquidity and the maintenance of a stable price of $1.00 per
share.

Principal Strategies
- ------------------------------

The Fund invests exclusively in obligations issued or guaranteed by the U.S.
Government, its agencies or instrumentalities and repurchase agreements that are
collateralized by such obligations. Some of these securities are not backed by
the full faith and credit of the U.S. Government. U.S. Government securities
include direct obligations of the U.S. Treasury (such as Treasury bills,
Treasury notes and Treasury bonds).

Securities purchased by the Fund generally have remaining maturities of 397 days
or less, although instruments subject to repurchase agreements and certain
variable and floating rate obligations may bear longer final maturities. The
average dollar-weighted maturity of the Fund will not exceed 90 days.

Risk Factors
- -------------------

- - The yield paid by the Fund is subject to changes in interest rates. As a
  result, there is risk that a decline in short-term interest rates would lower
  its yield and the overall return on your investment.
- - Although the Fund seeks to preserve the value of your investment at $1.00 per
  share, it is possible to lose money by investing in the Fund.

Your investment in the Fund is not insured or guaranteed by the U.S. Government
or any financial or government institution.
Historical Performance
- -----------------------------------

The bar chart and table below provide an indication of risk by showing how the
Fund's performance has varied from year to year. Past performance is not
necessarily indicative of how the Fund will perform in the future. You may call
1-800-388-3344 to obtain the Fund's current seven-day yield.

                                    [GRAPH]

TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>
93..........................................................  3.05%
94..........................................................  4.09%
95..........................................................  5.72%
96..........................................................  5.23%
97..........................................................  5.41%
98..........................................................  5.40%
99..........................................................  5.06%
</TABLE>

<TABLE>
<S>                             <C>
Highest Quarterly Return:             1.43%
  (1/1/93 through 12/31/99)     (2nd Quarter 1995)
Lowest Quarterly Return:              0.74%
  (1/1/93 through 12/31/99)     (4th Quarter 1993)
</TABLE>

<TABLE>
<CAPTION>
 AVERAGE ANNUAL TOTAL RETURN
- -----------------------------
       AS OF 12/31/99
- -----------------------------
                     SINCE
                   INCEPTION
1 YEAR   5 YEARS    (3/2/92)
- ------   -------   ----------
<S>      <C>       <C>
5.06%     5.36%      4.71%
</TABLE>

Fees and Expenses
- ----------------------------

This table describes the fees and expenses that you may pay if you buy and hold
shares of the U.S. Government Money Market Fund.(1)

Annual Fund Operating Expenses
(expenses that are deducted from Fund assets)

<TABLE>
<S>                                                  <C>
Management Fees                                       0.10%
Distribution (12b-1) Fees                             0.00
Other Expenses                                        0.18(2)
                                                     -----
TOTAL ANNUAL FUND OPERATING EXPENSES                  0.28%
                                                     =====
</TABLE>

(1)  The expense table and the Example below reflect the expenses of both the
     Fund and its corresponding Portfolio.

(2)  Other Expenses reflects current fees.

- --------------------------------------------------------------------------------

Prospectus                             21                        About the Funds
<PAGE>   24
AMERICAN AADVANTAGE
U.S. GOVERNMENT MONEY MARKET FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

Example
- -------------
This Example is intended to help you compare the cost of investing in the Fund
with the cost of investing in other mutual funds. The Example assumes that you
invest $10,000 in the Fund for the time periods indicated and then redeem all of
your shares at the end of those periods. The Example also assumes that your
investment has a 5% return each year and that the Fund's operating expenses
remain the same. Although your actual costs may be higher or lower, based on
these assumptions your costs would be:

<TABLE>
<S> <C>                                            <C>
    1 YEAR ....................................$29
    3 YEARS....................................$90
    5 YEARS...................................$157
    10 YEARS..................................$356
</TABLE>

Investment Adviser
- -----------------------------

AMR Investment Services, Inc.

- --------------------------------------------------------------------------------

About the Funds                        22                             Prospectus
<PAGE>   25

AMERICAN AADVANTAGE
MUNICIPAL MONEY MARKET FUND(SM)
- --------------------------------------------------------------------------------

Investment Objective
- -------------------------------

Current income, liquidity and the maintenance of a stable price of $1.00 per
share.

Principal Strategies
- ------------------------------

Under normal market conditions, the Fund invests at least 80% of its net assets
in securities whose interest income is exempt from federal income tax. These
securities may be issued by or on behalf of the governments of U.S. states,
counties, cities, towns, territories, or public authorities. All securities
purchased by the Fund will be guaranteed by the U.S. Government, its agencies,
or instrumentalities; secured by irrevocable letters of credit issued by
qualified banks; or guaranteed by one or more municipal bond insurance policies.

The Fund will only buy securities with the following credit qualities:
- - rated in the highest short-term categories by two rating organizations, such
  as "A-1" by Standard & Poor's Corporation and "P-1" by Moody's Investors
  Service, Inc., at the time of purchase,
- - rated in the highest short-term category by one rating organization if the
  securities are rated only by one rating organization, or
- - unrated securities that are determined to be of equivalent quality by the
  Manager pursuant to guidelines approved by the Board of Trustees.

Securities purchased by the Fund generally have remaining maturities of 397 days
or less, although instruments subject to repurchase agreements and certain
variable and floating rate obligations may bear longer final maturities. The
average dollar-weighted maturity of the Fund will not exceed 90 days.

Risk Factors
- -------------------
- - The yield paid by the Fund is subject to changes in interest rates. As a
  result, there is risk that a decline in short-term interest rates would lower
  its yield and the overall return on your investment.
- - Although the Fund seeks to preserve the value of your investment at $1.00 per
  share, it is possible to lose money by investing in the Fund.
- - As with any money market fund, there is the risk that the issuers or
  guarantors of securities owned by the Fund will default on the payment of
  principal or interest or the obligation to repurchase securities from the
  Fund.

Your investment in the Fund is not insured or guaranteed by the U.S. Government
or any financial or government institution.

Historical Performance
- -----------------------------------

The bar chart and table below provide an indication of risk by showing how the
Fund's performance has varied from year to year. Past performance is not
necessarily indicative of how the Fund will perform in the future. You may call
1-800-388-3344 to obtain the Fund's current seven-day yield.

                                    [GRAPH]

          TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>
94..........................................................  2.66%
95..........................................................  3.81%
96..........................................................  3.51%
97..........................................................  3.55%
98..........................................................  3.37%
99..........................................................  3.00%
</TABLE>

<TABLE>
<S>                             <C>
Highest Quarterly Return:             1.00%
  (1/1/94 through 12/31/99)     (2nd Quarter 1995)
Lowest Quarterly Return:              0.52%
  (1/1/94 through 12/31/99)     (1st Quarter 1994)
</TABLE>

<TABLE>
<CAPTION>
 AVERAGE ANNUAL TOTAL RETURN
- -----------------------------
       AS OF 12/31/99
- -----------------------------
                     SINCE
                   INCEPTION
1 YEAR   5 YEARS   (11/10/93)
- ------   -------   ----------
<S>      <C>       <C>
3.00%     3.45%      3.29%
</TABLE>

- --------------------------------------------------------------------------------

Prospectus                             23                        About the Funds
<PAGE>   26
AMERICAN AADVANTAGE
MUNICIPAL MONEY MARKET FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

Fees and Expenses
- ----------------------------

This table describes the fees and expenses that you may pay if you buy and hold
shares of the Municipal Money Market Fund.(1)

Annual Fund Operating Expenses (expenses that are deducted from Fund assets)

<TABLE>
<S>                                                   <C>
Management Fees                                       0.10%
Distribution (12b-1) Fees                             0.00
Other Expenses                                        0.29
                                                      ----
TOTAL ANNUAL FUND OPERATING EXPENSES                  0.39%
                                                      ====
</TABLE>

(1)   The expense table and the Example below reflect the expenses of both the
      Fund and its corresponding Portfolio.

<TABLE>
<S> <C>                                            <C>
    Example
    -------------
    This Example is intended to help you compare
    the cost of investing in the Fund with the
    cost of investing in other mutual funds. The
    Example assumes that you invest $10,000 in the
    Fund for the time periods indicated and then
    redeem all of your shares at the end of those
    periods. The Example also assumes that your
    investment has a 5% return each year and that
    the Fund's operating expenses remain the same.
    Although your actual costs may be higher or
    lower, based on these assumptions your costs
    would be:
    1 YEAR ....................................$40
    3 YEARS...................................$125
    5 YEARS...................................$219
    10 YEARS..................................$493
</TABLE>

Investment Adviser
- -----------------------------

AMR Investment Services, Inc.

- --------------------------------------------------------------------------------

About the Funds                        24                             Prospectus
<PAGE>   27

The Manager
- ---------------------

The Trust has retained AMR Investment Services, Inc. to serve as its Manager.
The Manager, located at 4333 Amon Carter Boulevard, Fort Worth, Texas 76155, is
a wholly owned subsidiary of AMR Corporation, the parent company of American
Airlines, Inc. The Manager was organized in 1986 to provide investment
management, advisory, administrative and asset management consulting services.
As of December 31, 1999, the Manager had approximately $21.7 billion of assets
under management, including approximately $8.4 billion under active management
and $13.3 billion as named fiduciary or financial adviser. Of the total,
approximately $15.3 billion of assets are related to AMR Corporation.

The Manager provides or oversees the provision of all administrative, investment
advisory and portfolio management services to the Funds. The Manager

- - develops the investment programs for each Fund,
- - selects and changes investment advisers (subject to requisite approvals),
- - allocates assets among investment advisers,
- - monitors the investment advisers' investment programs and results,
- - coordinates the investment activities of the investment advisers to ensure
  compliance with regulatory restrictions,
- - oversees each Fund's securities lending activities and actions taken by the
  securities lending agent, and
- - with the exception of the International Equity and S&P 500 Index Funds,
  invests the portion of Fund assets that the investment advisers determine
  should be allocated to high quality short-term debt obligations.

As compensation for providing management services, the Manager receives an
annualized advisory fee that is calculated and accrued daily, equal to the sum
of:

- - 0.25% of the net assets of the Manager's portion of the Intermediate Bond
  Fund,
- - 0.25% of the net assets of the Short-Term Bond Fund, plus
- - 0.10% of the net assets of all other Funds.

In addition, the Balanced, Large Cap Value, Small Cap Value, International
Equity and Intermediate Bond Funds pay the Manager the amounts due to their
respective investment advisers. The Manager then remits these amounts to the
investment advisers.

The Manager also may receive up to 25% of the net annual interest income or up
to 25% of loan fees in regards to securities lending activities. Currently, the
Manager receives 10% of the net annual interest income from the investment of
cash collateral or 10% of the loan fees posted by borrowers. The Securities and
Exchange Commission ("SEC") has granted exemptive relief that permits the Funds
to invest cash collateral received from securities lending transactions in
shares of one or more private or registered investment companies managed by the
Manager.

The management fees paid by the Funds for the fiscal year ended October 31,
1999, net of reimbursements and shown as a percentage of average net assets,
were as follows:

<TABLE>
<CAPTION>
                                       MANAGEMENT
                FUND                      FEES
                ----                  ------------
<S>                                   <C>
Balanced............................     0.30%
Large Cap Value.....................     0.30%
Small Cap Value.....................     0.67%
Intermediate Bond...................     0.25%
International Equity................     0.36%
S&P 500 Index Fund..................     0.08%
Short-Term Bond.....................     0.25%
Money Market........................     0.10%
U.S. Government Money Market........     0.10%
Municipal Money Market..............     0.10%
</TABLE>

William F. Quinn and Nancy A. Eckl have primary responsibility for the
day-to-day operations of the Balanced, Large Cap Value, Small Cap Value,
International Equity and Intermediate Bond Funds, except as indicated otherwise
below. These responsibilities include oversight of the investment advisers,
regular review of each investment adviser's performance and asset allocations
among multiple investment advisers. Mr. Quinn has served as President of the
Manager since its inception in 1986. Ms. Eckl has served as Vice President-Trust
Investments of the Manager since May 1995. Prior to her current position, Ms.
Eckl held the position of Vice President-Finance and Compliance of the Manager
from December 1990 through April 1995.

Michael W. Fields oversees the team responsible for the portfolio management of
the Short-Term Bond Fund. Mr. Fields has been with the Manager since it was
founded in 1986 and serves as Vice President-Fixed Income Investments.

Equity 500 Index Portfolio Administrator
- ------------------------------------------------------------

State Street serves as the adviser, administrator, custodian and transfer agent
to the Equity 500 Index Portfolio. As compensation for its services as adviser,
administrator, custodian and transfer agent (and for assuming ordinary operating
expenses of the portfolio including ordinary legal and audit expenses), State
Street receives an advisory fee at an annual rate of 0.045% of the average daily
net assets of the Portfolio.

The Investment Advisers
- ----------------------------------------

Set forth below is a brief description of the investment advisers for each Fund.
The Manager is the sole investment adviser of the Money Market Funds and the
Short-Term Bond Fund. Except for these

- --------------------------------------------------------------------------------

Prospectus                             25                        About the Funds
<PAGE>   28

Funds and the S&P 500 Index Fund, each Fund's assets are allocated among the
investment advisers by the Manager. The assets of the Intermediate Bond Fund are
allocated by the Manager between the Manager and another investment adviser.
Each investment adviser has discretion to purchase and sell securities for its
segment of a Fund's assets in accordance with the Fund's objectives, policies,
restrictions and more specific strategies provided by the Manager. Pursuant to
an exemptive order issued by the SEC, the Manager is permitted to enter into new
or modified investment advisory agreements with existing or new investment
advisers without approval of a Fund's shareholders, but subject to approval of
the Trust's Board of Trustees ("Board") and the AMR Investment Services Trust
Board ("AMR Trust Board"). The Prospectus will be supplemented if additional
investment advisers are retained or the contract with any existing investment
adviser is terminated.

BARROW, HANLEY, MEWHINNEY & STRAUSS, INC. ("BARROW"), 3232 McKinney Avenue, 15th
Floor, Dallas, Texas 75204, is a professional investment counseling firm which
has been providing investment advisory services since 1979. The firm is wholly
owned by United Asset Management Corporation, a Delaware corporation. As of
December 31, 1999, Barrow had discretionary investment management authority with
respect to approximately $29.1 billion of assets, including approximately $1.3
billion of assets of AMR and its subsidiaries and affiliated entities. Barrow
serves as an investment adviser to the Balanced, Large Cap Value, Intermediate
Bond and Short-Term Bond Funds, although the Manager does not presently intend
to allocate any of the assets in the Short-Term Bond Fund to Barrow.

BRANDYWINE ASSET MANAGEMENT, INC. ("BRANDYWINE"), 201 North Walnut Street,
Wilmington, Delaware 19801, is a professional investment counseling firm founded
in 1986. Brandywine is a wholly owned subsidiary of Legg Mason, Inc. As of
December 31, 1999, Brandywine had assets under management totaling approximately
$6.6 billion, including approximately $1.1 billion of assets of AMR and its
subsidiaries and affiliated entities. Brandywine serves as an investment adviser
to the Balanced, Large Cap Value and Small Cap Value Funds.

HOTCHKIS AND WILEY, 725 South Figueroa Street, Suite 4000, Los Angeles,
California 90017, is a professional investment management firm which was founded
in 1980. Hotchkis and Wiley is a division of Merrill Lynch Asset Management,
L.P., a wholly owned indirect subsidiary of Merrill Lynch & Co., Inc. Assets
under management as of December 31, 1999 were approximately $12.6 billion, which
included approximately $1.9 billion of assets of AMR and its subsidiaries and
affiliated entities. Hotchkis and Wiley serves as an investment adviser to the
Balanced, Large Cap Value, Small Cap Value, and International Equity Funds.

INDEPENDENCE INVESTMENT ASSOCIATES, INC. ("IIA"), 53 State Street, Boston,
Massachusetts 02109, is a professional investment counseling firm which was
founded in 1982. The firm is a wholly owned subsidiary of John Hancock Financial
Services. Assets under management as of December 31, 1999, including funds
managed for its parent company, were approximately $32.5 billion, which included
approximately $1.2 billion of assets of AMR and its subsidiaries and affiliated
entities. IIA serves as an investment adviser to the Balanced, Large Cap Value
and International Equity Funds.

LAZARD ASSET MANAGEMENT ("LAZARD"), 30 Rockefeller Plaza, New York, New York
10112, is a division of Lazard Freres & Co. LLC, a registered investment adviser
and member of the New York, American and Chicago Stock Exchanges, providing its
clients with a wide variety of investment banking, brokerage and related
services. Lazard provides investment management services to client discretionary
accounts with assets totaling approximately $74.5 billion as of December 31,
1999, including approximately $400 million of assets of AMR and its subsidiaries
and affiliated entities. Lazard serves as an investment adviser to the
International Equity Fund.

STATE STREET BANK AND TRUST COMPANY ("STATE STREET"), Two International Place,
Boston, Massachusetts 02110, is a Massachusetts banking corporation. State
Street serves as investment adviser and administrator to the Equity 500 Index
Portfolio. As of December 31, 1999, State Street Global Advisors, the division
responsible for managing the Portfolio, had assets under management of $672.4
billion.

TEMPLETON INVESTMENT COUNSEL, INC. ("TEMPLETON"), 500 East Broward Blvd., Suite
2100, Fort Lauderdale, Florida 33394-3091, is a professional investment
counseling firm which has been providing investment services since 1979.
Templeton is indirectly owned by Franklin Resources, Inc. As of December 31,
1999, Templeton had discretionary investment management authority with respect
to approximately $24.9 billion of assets, including approximately $842 million
of assets of AMR and its subsidiaries and affiliated entities. Templeton serves
as an investment adviser to the International Equity Fund.

All other assets of American Airlines, Inc. and its affiliates under management
by each respective investment adviser (except assets managed by Barrow under the
HALO Bond Program) are considered when calculating the fees for each investment
adviser other than State Street. Including these assets lowers the investment
advisory fees for each applicable Fund.

- --------------------------------------------------------------------------------

About the Funds                        26                             Prospectus
<PAGE>   29

Valuation of Shares
- -------------------------------

The price of each Fund's shares is based on its net asset value ("NAV") per
share. Each Fund's NAV is computed by adding total assets, subtracting all of
the Fund's liabilities, and dividing the result by the total number of shares
outstanding. Equity securities are valued based on market value. Debt securities
(other than short-term securities) usually are valued on the basis of prices
provided by a pricing service. In some cases, the price of debt securities is
determined using quotes obtained from brokers. Securities are valued at fair
value, as determined in good faith and pursuant to procedures approved by the
Board and the AMR Trust Board, under certain limited circumstances. For example,
fair valuation would be used if market quotations are not readily available or a
material event occurs after the close of the Exchange which may affect the
security's value. Securities held by the Money Market Funds are valued in
accordance with the amortized cost method, which is designed to enable those
Funds to maintain a stable NAV of $1.00 per share.

The NAV of Institutional Class shares will be determined based on a pro rata
allocation of the Portfolio's investment income, expenses and total capital
gains and losses. Each Fund's NAV per share is determined as of the close of the
New York Stock Exchange ("Exchange"), generally 4:00 p.m. Eastern Time, on each
day on which it is open for business. In addition to the days the Exchange is
closed, the Money Market Funds are also not open and no NAV is calculated on
Columbus Day and Veterans Day. The NAV per share of the International Equity
Fund may change on days when shareholders will not be able to purchase or redeem
the Fund's shares.

ABOUT YOUR INVESTMENT
- ------------------------------------------------------------
Purchase and Redemption of Shares
- -------------------------------------------------------

Eligibility
- ---------------

Institutional Class shares are offered without a sales charge to investors who
make an initial investment of at least $2 million, including:

- - agents or fiduciaries acting on behalf of their clients (such as employee
  benefit plans, personal trusts and other accounts for which a trust company or
  financial advisor acts as agent or fiduciary);
- - endowment funds and charitable foundations;
- - employee welfare plans which are tax-exempt under Section 501(c)(9) of the
  Internal Revenue Code of 1986, as amended ("Code");
- - qualified pension and profit sharing plans;
- - cash and deferred arrangements under Section 401(k) of the Code;
- - corporations; and
- - other investors who make an initial investment of at least $2 million.

The Manager may allow a reasonable period of time after opening an account for
an investor to meet the initial investment requirement. In addition, for
investors such as trust companies and financial advisors who make investments
for a group of clients, the minimum initial investment can be met through an
aggregated purchase order for more than one client.

Purchase Policies
- --------------------------

No sales charges are assessed on the purchase or sale of Fund shares. Shares of
the Funds are offered and purchase orders accepted until the deadlines listed
below on each day on which the Exchange is open for trading. In addition, shares
of the Money Market Funds are not offered and orders are not accepted on
Columbus Day and Veterans Day:

<TABLE>
<CAPTION>
                                   PURCHASE BY
             FUND                (EASTERN TIME)*:
             ----                ----------------
<S>                              <C>
Municipal Money Market              11:45 a.m.
All other Funds                      4:00 p.m.
</TABLE>

*   or the close of the Exchange (whichever comes first)

If a purchase order is received in good order prior to the applicable Fund's
deadline, the purchase price will be the NAV per share next determined on that
day. If a purchase order is received in good order after the applicable
deadline, the purchase price will be the NAV of the following day that the Fund
is open for business. Checks to purchase shares are accepted subject to
collection at full face value in U.S. funds and must be drawn in U.S. dollars on
a U.S. bank.

Opening an Account
- -------------------------------

A completed, signed application is required to open an account. You may request
an application form by:

- - calling (800) 967-9009, or
- - visiting the Funds' website at www.aafunds.com and downloading an account
  application.

Complete the application, sign it and

                                    Mail to:
                           American AAdvantage Funds
                            P.O. Box 619003, MD 5645
                           DFW Airport, TX 75261-9003

                                   or Fax to:
                        (817) 967-0768 or (817) 931-4331

- --------------------------------------------------------------------------------

Prospectus                             27                  About Your Investment
<PAGE>   30

Redemption Policies
- ------------------------------

Shares of any Fund may be redeemed by telephone or mail on any day that the Fund
is open for business. The redemption price will be the NAV next determined after
a redemption order is received in good order. For assistance with completing a
redemption request, please call (800) 658-5811. Except for the Money Market
Funds, wire proceeds from redemption orders received by 4:00 p.m. Eastern Time
generally are transmitted to shareholders on the next day that the Funds are
open for business. Proceeds from redemptions requested for the Money Market
Funds by the following deadlines will generally be wired to shareholders on the
same day.

<TABLE>
<CAPTION>
                              SAME DAY WIRE
FUND                    REDEMPTION ORDER DEADLINE:
- ----                    --------------------------
<S>                     <C>
Money Market and U.S.
  Government Money
  Market                 2:00 p.m. Eastern Time*
Municipal Money
  Market                11:45 a.m. Eastern Time*
</TABLE>

*    or the close of the Exchange (whichever comes first)

In any event, proceeds from a redemption order for any Fund will be transmitted
to a shareholder by no later than seven days after the receipt of a redemption
request in good order. Delivery of proceeds from shares purchased by check may
be delayed until the check has cleared, which may take up to 15 days.

The Funds reserve the right to suspend redemptions or postpone the date of
payment (i) when the Exchange is closed (other than for customary weekend and
holiday closings); (ii) when trading on the Exchange is restricted; (iii) when
the SEC determines that an emergency exists so that disposal of a Fund's
investments or determination of its NAV is not reasonably practicable; or (iv)
by order of the SEC for protection of the Funds' shareholders.

Although the Funds intend to redeem shares in cash, each Fund reserves the right
to pay the redemption price in whole or in part by a distribution of readily
marketable securities held by the applicable Fund's corresponding Portfolio.
Unpaid dividends credited to an account up to the date of redemption of all
shares of a Money Market Fund generally will be paid at the time of redemption.

- --------------------------------------------------------------------------------

About Your Investment                  28                             Prospectus
<PAGE>   31

<TABLE>
<CAPTION>
HOW TO PURCHASE SHARES
                To Make an Initial Purchase                                      To Add to an Existing Account
<S>                                                               <C>
By Wire
If your account has been established, you may call (800)          Call (800) 658-5811 to purchase shares by wire. Send a bank
658-5811 to purchase shares by wire. Send a bank wire to          wire to State Street Bank & Trust Co. with these
State Street Bank & Trust Co. with these instructions:            instructions:
- - ABA# 0110-0002-8; AC-9905-342-3
- - Attn: American AAdvantage Funds-Institutional Class             - ABA# 0110-0002-8; AC-9905-342-3
- - the Fund name and Fund number                                   - Attn: American AAdvantage Funds-Institutional Class
- - shareholder's account number and registration                   - the Fund name and Fund number
                                                                  - shareholder's account number and registration
By Check
- - Make check payable to American AAdvantage Funds                 - Include the shareholder's account number, Fund name and
- - Include the Fund name, Fund number and "Institutional             Fund number on the check.
  Class" on the check                                             - Mail the check to:
- - Mail the check to:
  American AAdvantage Funds                                       American AAdvantage Funds
  P.O. Box 219643                                                 P.O. Box 219643
  Kansas City, MO 64121-9643                                      Kansas City, MO 64121-9643
By Exchange
Shares of a Fund may be purchased by exchange from another American AAdvantage Fund if the shareholder has owned
Institutional Class shares of the other American AAdvantage Fund for at least 15 days. Send a written request to the address
above or call (800) 658-5811 to exchange shares.
</TABLE>

<TABLE>
<CAPTION>
HOW TO REDEEM SHARES
                          Method                                                    Additional Information
<S>                                                               <C>
By Telephone
Call (800) 658-5811 to request a redemption.                      Proceeds from redemptions placed by telephone will
                                                                  generally be transmitted by wire only, as instructed on the
                                                                  application form.
By Mail
Write a letter of instruction including:                          - Other supporting documents may be required for estates,
- - the Fund name and Fund number                                   trusts, guardianships, custodians, corporations, and
- - shareholder account number                                      welfare, pension and profit sharing plans. Call (800)
- - shares or dollar amount to be redeemed                          658-5811 for instructions.
- - authorized signature(s) of all persons required to sign         - Proceeds will only be mailed to the account address of
  for the account                                                 record or transmitted by wire to a commercial bank account
                                                                    designated on the account application form.
Mail to:                                                          - A signature guarantee is required for redemption orders:
                                                                  - in amounts of $100,000 or more
American AAdvantage Funds                                         - with a request to send the proceeds to an address or
P.O. Box 219643                                                     commercial bank account other than the address or
Kansas City, MO 64121-9643                                          commercial bank account designated on the account
                                                                    application, or
                                                                  - for an account whose address has changed within the last
                                                                    30 days.
By Exchange
Shares of a Fund may be redeemed in exchange for another American AAdvantage Fund -- Institutional Class if the shareholder
has owned Institutional Class shares of the Fund for at least 15 days. Send a written request to the address above or call
(800) 658-5811 to exchange shares.
</TABLE>

- --------------------------------------------------------------------------------

Prospectus                             29                  About Your Investment
<PAGE>   32

General Policies
- ------------------------

If a shareholder's account balance in any Fund falls below $100,000, the
shareholder may be asked to increase the balance. If the account balance remains
below $100,000 after 45 days, the Funds reserve the right to close the account
and send the proceeds to the shareholder.

The following policies apply to instructions you may provide to the Funds by
telephone:

- - The Funds, their officers, trustees, directors, employees, or agents are not
  responsible for the authenticity of instructions provided by telephone, nor
  for any loss, liability, cost or expense incurred for acting on them.
- - The Funds employ procedures reasonably designed to confirm that instructions
  communicated by telephone are genuine.
- - Due to the volume of calls or other unusual circumstances, telephone
  redemptions may be difficult to implement during certain time periods.

The Funds reserve the right to:

- - reject any order for the purchase of shares and to limit or suspend, without
  prior notice, the offering of shares,
- - modify or terminate the exchange privilege at any time,
- - terminate the exchange privilege of any shareholder who makes more than one
  exchange in and out of a Fund (other than the Money Market Funds) during any
  three month period,
- - seek reimbursement from the shareholder for any related loss incurred if
  payment for the purchase of Fund shares by check does not clear the
  shareholder's bank.

Third parties who offer Fund shares, such as banks, broker-dealers and 401(k)
plan providers, may charge transaction fees and may set different minimum
investments or limitations on purchasing or redeeming shares.

Distributions and Taxes
- ---------------------------------------

The Funds distribute most or all of their net earnings in the form of dividends
from net investment income and distributions of realized net capital gains and
gains from certain foreign currency transactions. Unless the account application
instructs otherwise, distributions will be reinvested in additional Fund shares.
Monthly distributions are paid to shareholders on the first business day of the
following month.

Distributions are paid as follows:

<TABLE>
<CAPTION>
                                                  OTHER
                                              DISTRIBUTIONS
FUND                      DIVIDENDS PAID          PAID
- ----                      --------------      -------------
<S>                    <C>                    <C>

Balanced               Annually                  Annually
Large Cap Value        Annually                  Annually
Small Cap Value        Annually                  Annually
International Equity   Annually                  Annually
S&P 500 Index          April, July, October      Annually
                         and December
Intermediate Bond      Monthly                   Annually
Short-Term Bond        Monthly                   Annually
Money Market           Monthly                   Monthly
U.S. Government Money  Monthly                   Monthly
  Market
Municipal Money        Monthly                   Monthly
  Market
</TABLE>

Usually, dividends received from a Fund (except the Municipal Money Market Fund)
are taxable as ordinary income, regardless of whether dividends are reinvested.
Distributions by a Fund of realized net short-term capital gains and gains from
certain foreign currency transactions are similarly taxed. Distributions by the
Funds of realized net long-term capital gains are taxable to their shareholders
as long-term capital gains regardless of how long an investor has been a
shareholder.

Some foreign countries may impose taxes on dividends paid to and gains realized
by the International Equity Fund. The Fund may treat these taxes as a deduction
or, under certain conditions, "flow the tax through" to shareholders. In the
latter event, shareholders may either deduct the taxes or use them to calculate
a credit against their federal income tax.

A portion of the income dividends paid by the Balanced Fund, the Large Cap Value
Fund, the Small Cap Value Fund and the S&P 500 Index Fund is eligible for the
dividends-received deduction allowed to corporations. The eligible portion may
not exceed the Fund's aggregate dividends received from U.S. corporations.
However, dividends received by a corporate shareholder and deducted by it
pursuant to the dividends-received deduction may be subject indirectly to the
federal alternative minimum tax ("AMT"). The International Equity Fund's
dividends most likely will not qualify for the dividends-received deduction
because none of the dividends received by that Fund are expected to be paid by
U.S. corporations.

The Municipal Money Market Fund designates most of its distributions as
"exempt-interest dividends," which may be excluded from gross income. If the
Fund earns taxable income from any of its investments, that income will be
distributed as a taxable dividend. If the Fund invests in private activity
obligations, shareholders will be required to treat a portion of the
exempt-interest dividends they receive as a "tax preference item" in determining
their liability for the AMT. Some states exempt from income tax the interest on
their own obligations and

- --------------------------------------------------------------------------------

About Your Investment                  30                             Prospectus
<PAGE>   33

on obligations of governmental agencies and municipalities in the state;
accordingly, each year shareholders will receive tax information on the Fund's
exempt-interest income by state.

Shareholders may realize a taxable gain or loss when selling or exchanging
shares (other than shares of the Money Market Funds). That gain or loss may be
treated as a short-term or long-term gain, depending on how long the sold or
exchanged shares were held.

This is only a summary of some of the important income tax considerations that
may affect Fund shareholders. Shareholders should consult their tax adviser
regarding specific questions as to the effect of federal, state or local income
taxes on an investment in the Funds.

ADDITIONAL INFORMATION
- ----------------------
Distribution of Trust Shares
- ----------------------------

The Trust does not incur any direct distribution expenses related to
Institutional Class shares. However, the Trust has adopted a Distribution Plan
in accordance with Rule 12b-1 under the Investment Company Act of 1940 ("1940
Act") which authorizes the use of any fees received by the Manager in accordance
with the Administrative Services and Management Agreements, and any fees
received by the investment advisers pursuant to their Advisory Agreements with
the Manager, to be used for the sale and distribution of Fund shares. In the
event the Trust begins to incur distribution expenses for the Funds,
distribution fees may be paid out of Fund assets, possibly causing the cost of
your investment to increase over time.

Master-Feeder Structure
- -----------------------

This means that each Fund is a "feeder" fund that invests all of its investable
assets in a "master" fund with the same investment objective. The "master" fund
purchases securities for investment. The master-feeder structure works as
follows:

                               [Structure Chart]

Each Fund can withdraw its investment in its corresponding Portfolio at any time
if the Board determines that it is in the best interest of the Fund and its
shareholders to do so. If this happens, the Fund's assets will be invested
according to the investment policies and restrictions described in this
Prospectus.

Financial Highlights
- --------------------

The financial highlights tables are intended to help you understand each Fund's
financial performance for the past five fiscal years (or, if shorter, the period
of the Fund's operations). Certain information reflects financial results for a
single Fund share. The total returns in the table represent the rate that an
investor would have earned (or lost) on an investment in the Fund (assuming
reinvestment of all dividends and distributions). Except for the S&P 500 Index
Fund, each Fund's highlights were audited by Ernst & Young LLP, independent
auditors. The financial highlights of the S&P 500 Index Fund were audited by
PricewaterhouseCoopers LLP, independent auditors. More financial information
about the Funds is found in their Annual Report, which you may obtain upon
request.

- --------------------------------------------------------------------------------

Prospectus                             31                 Additional Information
<PAGE>   34

<TABLE>
<CAPTION>
                                                                          BALANCED FUND-INSTITUTIONAL CLASS
                                                              ----------------------------------------------------------
                                                                                YEAR ENDED OCTOBER 31,
                                                              ----------------------------------------------------------
                                                              1999(A)     1998(A)     1997(A)     1996(A B)    1995(A C)
       FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD:         --------    --------    --------    ---------    ---------
<S>                                                           <C>         <C>         <C>         <C>          <C>
Net asset value, beginning of period........................  $  14.56    $  16.18    $  15.14    $  13.95     $  12.36
Income from investment operations
  Net investment income.....................................      0.50(E)     0.51(E)     0.63(E)     0.59(E)      0.54
  Net gains (losses) on securities (realized and
    unrealized).............................................     (0.39)(E)     0.76(E)     2.16(E)     1.61(E)     1.71
                                                                          --------    --------    --------     --------
Total from investment operations............................      0.11        1.27        2.79        2.20         2.25
                                                                          --------    --------    --------     --------
Less distributions:
  Dividends from net investment income......................     (0.49)      (0.63)      (0.59)      (0.57)       (0.52)
  Distributions from net realized gains on securities.......     (1.17)      (2.26)      (1.16)      (0.44)       (0.14)
                                                                          --------    --------    --------     --------
Total distributions.........................................     (1.66)      (2.89)      (1.75)      (1.01)       (0.66)
                                                                          --------    --------    --------     --------
Net asset value, end of period..............................  $  13.01    $  14.56    $  16.18    $  15.14     $  13.95
                                                              ========    ========    ========    ========     ========
Total return................................................      0.53%       9.04%      20.04%      16.46%      19.39%
                                                              ========    ========    ========    ========     ========
Ratios and supplemental data:
  Net assets, end of period (in thousands)..................  $139,519    $145,591    $148,176    $298,009     $249,913
  Ratios to average net assets
    Expenses................................................      0.59%(E)     0.59%(E)     0.60%(E)     0.62%(E)    0.63%
    Net investment income...................................      3.55%(E)     3.54%(E)     3.88%(E)     4.00%(E)    4.30%
Portfolio turnover rate(D)..................................        90%         87%        105%         76%         73%
</TABLE>

(A)Class expenses per share were subtracted from net investment income per share
   for the Fund before class expenses to determine net investment income per
   share.

(B)Brandywine Asset Management, Inc. replaced Capital Guardian Trust Company as
   an investment adviser to the Fund as of April 1, 1996.

(C)GSB Investment Management, Inc. was added as an investment adviser to the
   Balanced Fund on January 1, 1995.

(D)On November 1, 1995 the Balanced Fund began investing all of its investable
   assets in its corresponding Portfolio. Portfolio turnover rate since November
   1, 1995 is that of the Portfolio.

(E)The per share amounts and ratios reflect income and expenses assuming
   inclusion of the Fund's proportionate share of the income and expenses of the
   AMR Investment Services Balanced Portfolio.

- --------------------------------------------------------------------------------

Additional Information                 32                             Prospectus
<PAGE>   35

<TABLE>
<CAPTION>
                                                                      LARGE CAP VALUE FUND-INSTITUTIONAL CLASS
                                                              ---------------------------------------------------------
                                                                               YEAR ENDED OCTOBER 31,
                                                              ---------------------------------------------------------
                                                              1999(A E)    1998(A)     1997(A)     1996(A B)    1995(A)
       FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD:         ---------    --------    --------    ---------    -------
<S>                                                           <C>          <C>         <C>         <C>          <C>
Net asset value, beginning of period........................   $ 20.93     $  21.63    $  18.50     $ 15.91     $ 14.19
Income from investment operations
  Net investment income.....................................      0.38(D)      0.40(D)     0.42(D)     0.42(D)     0.41
  Net gains on securities (realized and unrealized).........      0.04(D)      0.89(D)     4.43(D)     3.15(D)     2.28
                                                               -------     --------    --------     -------     -------
Total from investment operations............................      0.42         1.29        4.85        3.57        2.69
                                                               -------     --------    --------     -------     -------
Less distributions:
  Dividends from net investment income......................     (0.40)       (0.41)      (0.41)      (0.41)      (0.43)
  Distributions from net realized gains on securities.......     (2.26)       (1.58)      (1.31)      (0.57)      (0.54)
                                                               -------     --------    --------     -------     -------
Total distributions.........................................     (2.66)       (1.99)      (1.72)      (0.98)      (0.97)
                                                               -------     --------    --------     -------     -------
Net asset value, end of period..............................   $ 18.69     $  20.93    $  21.63     $ 18.50     $ 15.91
                                                               =======     ========    ========     =======     =======
Total return................................................      1.72%        6.28%      28.05%      23.37%      20.69%
                                                               =======     ========    ========     =======     =======
Ratios and supplemental data:
  Net assets, end of period (in thousands)..................   $45,039     $216,548    $200,887     $81,183     $71,608
  Ratios to average net assets
    Expenses................................................      0.59%(D)     0.57%(D)     0.61%(D)     0.62%(D)    0.62%
    Net investment income...................................      1.94%(D)     1.86%(D)     2.10%(D)     2.55%(D)    2.84%
Portfolio turnover rate(C)..................................        33%          40%         35%         40%         26%
</TABLE>

(A)Class expenses per share were subtracted from net investment income per share
   for the Fund before class expenses to determine net investment income per
   share.
(B)Brandywine Asset Management, Inc. replaced Capital Guardian Trust Company as
   an investment adviser to the Fund as of April 1, 1996.
(C)On November 1, 1995 the Large Cap Value Fund began investing all of its
   investable assets in its corresponding Portfolio. Portfolio turnover rate
   since November 1, 1995 is that of the Portfolio.
(D)The per share amounts and ratios reflect income and expenses assuming
   inclusion of the Fund's proportionate share of the income and expenses of the
   AMR Investment Services Large Cap Value Portfolio.
(E)Prior to March 1, 1999, the Large Cap Value Fund-Institutional Class was
   known as the Growth and Income Fund-Institutional Class.

<TABLE>
<CAPTION>
                                                                   SMALL CAP
                                                                  VALUE FUND-
                                                              INSTITUTIONAL CLASS
                                                              -------------------
                                                               DECEMBER 31, 1998
                                                                      TO
                                                               OCTOBER 31, 1999
       FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD:         -------------------
<S>                                                           <C>
Net asset value, beginning of period........................         $10.00
                                                                     ------
Income from investment operations:
  Net investment income(A)..................................           0.07
  Net gains (losses) on securities (both realized and
    unrealized)(A)..........................................          (1.00)
                                                                     ------
Total from investment operations............................          (0.93)
                                                                     ------
Less distributions:
  Dividends from net investment income......................             --
  Distributions from net realized gains on securities.......             --
                                                                     ------
Total distributions.........................................             --
                                                                     ------
Net asset value, end of period..............................         $ 9.07
                                                                     ======
Total return (not annualized)...............................          (9.30)%
                                                                     ======
Ratios and supplemental data:
  Net assets, end of period (in thousands)..................         $2,117
  Ratios to average net assets (annualized)(A):
    Expenses................................................           0.96%
    Net investment income...................................           0.84%
    Decrease reflected in above expense ratio due to
     absorption of expenses by the Manager..................           1.23%
    Portfolio turnover rate(B)..............................             31%
</TABLE>

(A)The per share amounts and ratios reflect income and expenses assuming
   inclusion of the Fund's proportionate share of the income and expenses of the
   AMR Investment Services Small Cap Value Portfolio.
(B)The American AAdvantage Small Cap Value Fund invests all of its investable
   assets in its corresponding Portfolio. Portfolio turnover rate is that of the
   Portfolio.

- --------------------------------------------------------------------------------

Prospectus                             33                 Additional Information
<PAGE>   36

<TABLE>
<CAPTION>
                                                                   INTERNATIONAL EQUITY FUND-INSTITUTIONAL CLASS
                                                              -------------------------------------------------------
                                                                              YEAR ENDED OCTOBER 31,
                                                              -------------------------------------------------------
                                                              1999(A B)    1998(A)     1997(A)     1996(A)    1995(A)
       FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD:         ---------    --------    --------    -------    -------
<S>                                                           <C>          <C>         <C>         <C>        <C>
Net asset value, beginning of period........................  $  16.93     $  17.08    $  15.01    $ 13.29    $ 12.87
Income from investment operations
  Net investment income.....................................      0.35(D)      0.33(D)     0.34(D)    0.28(D)    0.27
  Net gains on securities (realized and unrealized).........      2.92(D)      0.34(D)     2.44(D)    1.95(D)    0.68
                                                              --------     --------    --------    -------    -------
Total from investment operations............................      3.27         0.67        2.78       2.23       0.95
                                                              --------     --------    --------    -------    -------
Less distributions:
  Dividends from net investment income......................     (0.35)       (0.34)      (0.30)     (0.27)     (0.21)
  Distributions from net realized gains on securities.......     (0.49)       (0.48)      (0.41)     (0.24)     (0.32)
                                                              --------     --------    --------    -------    -------
Total distributions.........................................     (0.84)       (0.82)      (0.71)     (0.51)     (0.53)
                                                              --------     --------    --------    -------    -------
Net asset value, end of period..............................  $  19.36     $  16.93    $  17.08    $ 15.01    $ 13.29
                                                              ========     ========    ========    =======    =======
Total return................................................     19.98%        4.19%      19.08%     17.27%      7.90%
                                                              ========     ========    ========    =======    =======
Ratios and supplemental data:
  Net assets, end of period (in thousands)..................  $601,923     $408,581    $231,793    $62,992    $25,757
  Ratios to average net assets
    Expenses................................................      0.64%(D)     0.80%(D)     0.83%(D)    0.85%(D)    0.85%
    Net investment income...................................      2.00%(D)     2.05%(D)     2.35%(D)    2.19%(D)    2.37%
Portfolio turnover rate(c)..................................        63%          24%         15%        19%        21%
</TABLE>

(A)Class expenses per share were subtracted from net investment income per share
   for the Fund before class expenses to determine net investment income per
   share.

(B)On March 1, 1999, Morgan Stanley Assets Management, Inc. was replaced as an
   investment advisor to the International Equity Fund by Lazard Asset
   Management and Independence Investment Associates.

(C)On November 1, 1995 the International Equity Fund began investing all of its
   investable assets in its corresponding Portfolio. Portfolio turnover rate
   since November 1, 1995 is that of the Portfolio.

(D)The per share amounts and ratios reflect income and expenses assuming
   inclusion of the Fund's proportionate share of the income and expenses of the
   AMR Investment Services International Equity Portfolio.

<TABLE>
<CAPTION>
                                                                          S&P 500
                                                                        INDEX FUND-
                                                                  INSTITUTIONAL CLASS(A)
                                                              -------------------------------
                                                                  YEAR ENDED DECEMBER 31,
                                                              -------------------------------
                                                                1999        1998      1997(B)
       FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD:         --------    --------    -------
<S>                                                           <C>         <C>         <C>
Net asset value, beginning of period........................  $  16.78    $  13.16    $10.00
Income from investment operations
  Net investment income(C)..................................      0.19        0.16      0.14
  Net gains on securities (realized and unrealized)(C)......      3.27        3.62      3.16
                                                              --------    --------    ------
Total from investment operations............................      3.46        3.78      3.30
                                                              --------    --------    ------
Less distributions:
  Dividends from net investment income......................     (0.19)      (0.16)    (0.14)
                                                              --------    --------    ------
Total distributions.........................................     (0.19)      (0.16)    (0.14)
                                                              --------    --------    ------
Net asset value, end of period..............................  $  20.05    $  16.78    $13.16
                                                              ========    ========    ======
Total return................................................     20.70%      28.87%    33.09%
                                                              ========    ========    ======
Ratios and supplemental data:
  Net assets, end of period (in thousands)..................  $568,645    $100.870    $7,862
  Ratios to average net assets (annualized)(C)
    Net investment income...................................      1.28%       1.41%     1.61%
    Expenses................................................      0.17%       0.20%     0.20%
    Decrease reflected in above expense ratio due to
     absorption of expenses by Bankers Trust and the
     Manager................................................        --        0.06%     0.43%
Portfolio turnover rate(D)..................................        13%          4%       19%
</TABLE>

(A)Prior to March 1, 2000, the S&P 500 Index Fund -- Institutional Class
   invested all of its investable assets in the BT Equity 500 Index Portfolio, a
   separate investment company managed by Bankers Trust Company.

(B)The S&P 500 Index Fund commenced active operations on December 31, 1996 and
   on March 1, 1998, existing shares were designated Institutional Class shares.

(C)The per share amounts and ratios reflect income and expenses assuming
   inclusion of the Fund's proportionate share of the income and expenses of the
   BT Equity 500 Index Portfolio.

(D)Portfolio turnover rate is that of the BT Equity 500 Index Portfolio.

- --------------------------------------------------------------------------------

Additional Information                 34                             Prospectus
<PAGE>   37

<TABLE>
<CAPTION>
                                                                      INTERMEDIATE BOND FUND-
                                                                        INSTITUTIONAL CLASS
                                                              ----------------------------------------
                                                                   YEAR ENDED
                                                                  OCTOBER 31,         SEPTEMBER 15 TO
                                                              --------------------      OCTOBER 31,
                                                                1999        1998            1997
       FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD:         --------    --------    ----------------
<S>                                                           <C>         <C>         <C>
Net asset value, beginning of period........................  $  10.50    $  10.17        $  10.00
Income from investment operations
  Net investment income(A)..................................      0.56        0.59            0.07
  Net gains (losses) on securities (realized and
    unrealized)(A)..........................................     (0.63)       0.34            0.17
                                                              --------    --------        --------
Total from investment operations............................     (0.07)       0.93            0.24
                                                              --------    --------        --------
Less distributions:
  Dividends from net investment income......................     (0.56)      (0.59)          (0.07)
  Distributions from net realized gains on securities.......     (0.29)      (0.01)             --
                                                              --------    --------        --------
Total distributions.........................................     (0.85)      (0.60)          (0.07)
                                                              --------    --------        --------
Net asset value, end of period..............................  $   9.58    $  10.50        $  10.17
                                                              ========    ========        ========
Total return (not annualized)...............................     (0.83)%      9.37%           2.41%
                                                              ========    ========        ========
Ratios and supplemental data:
  Net assets, end of period (in thousands)..................  $205,218    $178,840        $216,249
  Ratios to average net assets (annualized)(A)
  Expenses..................................................      0.55%       0.57%           0.59%
    Net investment income...................................      5.62%       5.74%           5.63%
Portfolio turnover rate(B)..................................       123%        181%             47%
</TABLE>

(A)The per share amounts and ratios reflect income and expenses assuming
   inclusion of the Fund's proportionate share of the income and expenses of the
   AMR Investment Services Intermediate Bond Portfolio.

(B)The American AAdvantage Intermediate Bond Fund invests all of its investable
   assets in its corresponding Portfolio. Portfolio turnover rate is that of the
   Portfolio.

<TABLE>
<CAPTION>
                                                                    SHORT-TERM BOND FUND-INSTITUTIONAL CLASS
                                                              -----------------------------------------------------
                                                                             YEAR ENDED OCTOBER 31,
                                                              -----------------------------------------------------
                                                               1999     1998(A)      1997        1996        1995
       FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD:         ------    -------    --------    --------    --------
<S>                                                           <C>       <C>        <C>         <C>         <C>
Net asset value, beginning of period........................  $ 9.63    $  9.63    $   9.68    $   9.82    $   9.67
Income from investment operations
  Net investment income.....................................    0.53(C)    0.62(C)     0.64(C)     0.62(C)     0.62
  Net gains (losses) on securities (realized and
    unrealized).............................................   (0.29)(C)      --(C)    (0.05)(C)    (0.14)(C)     0.15
                                                              ------    -------    --------    --------    --------
Total from investment operations............................    0.24       0.62        0.59        0.48        0.77
                                                              ------    -------    --------    --------    --------
Less distributions:
  Dividends from net investment income......................   (0.57)     (0.62)      (0.64)      (0.62)      (0.62)
  Distributions from net realized gains on securities.......      --         --          --          --          --
                                                              ------    -------    --------    --------    --------
Total distributions.........................................   (0.57)     (0.62)      (0.64)      (0.62)      (0.62)
                                                              ------    -------    --------    --------    --------
Net asset value, end of period..............................  $ 9.30    $  9.63    $   9.63    $   9.68    $   9.82
                                                              ======    =======    ========    ========    ========
Total return................................................    2.56%      6.60%       6.29%       5.10%       8.18%
                                                              ======    =======    ========    ========    ========
Ratios and supplemental data:
  Net assets, end of period (in thousands)..................  $5,034    $18,453    $ 22,947    $108,929    $137,293
  Ratios to average net assets
    Expenses................................................    0.62%(C)    0.65%(C)     0.57%(C)     0.60%(C)     0.60%
    Net investment income...................................    5.92%(C)    6.43%(C)     6.67%(C)     6.41%(C)     6.36%
Portfolio turnover rate(B)..................................     115%        74%        282%        304%        183%
</TABLE>

(A)Prior to March 1, 1998, the Short-Term Bond Fund-Institutional Class was
   known as the Limited-Term Income Fund-Institutional Class.

(B)On November 1, 1995 the Short-Term Bond Fund began investing all of its
   investable assets in the Short-Term Bond Portfolio. Portfolio turnover rate
   since November 1, 1995 is that of the Portfolio.

(C)The per share amounts and ratios reflect income and expenses assuming
   inclusion of the Fund's proportionate share of the income and expenses of the
   AMR Investment Services Short-Term Bond Portfolio.

- --------------------------------------------------------------------------------

Prospectus                             35                 Additional Information
<PAGE>   38

<TABLE>
<CAPTION>
                                                                   MONEY MARKET FUND-INSTITUTIONAL CLASS
                                        -------------------------------------------------------------------------------------------
                                                                                     YEAR ENDED OCTOBER 31,
                                        TWO MONTHS ENDED     ----------------------------------------------------------------------
FOR A SHARE OUTSTANDING THROUGHOUT THE  DECEMBER 31, 1999       1999           1998           1997           1996           1995
PERIOD:                                 -----------------    ----------     ----------     ----------     ----------     ----------
<S>                                     <C>                  <C>            <C>            <C>            <C>            <C>
Net asset value, beginning of
 period...............................     $     1.00        $     1.00     $     1.00     $     1.00     $     1.00     $     1.00
                                           ----------        ----------     ----------     ----------     ----------     ----------
   Net investment income..............           0.01(A)           0.05(A)        0.06(A)        0.06(A)        0.05(A)        0.06
   Less dividends from net investment
     income...........................          (0.01)            (0.05)         (0.06)         (0.06)         (0.05)         (0.06)
                                           ----------        ----------     ----------     ----------     ----------     ----------
Net asset value, end of period........     $     1.00        $     1.00     $     1.00     $     1.00     $     1.00     $     1.00
                                           ==========        ==========     ==========     ==========     ==========     ==========
Total return (not annualized).........           0.94%(B)          5.09%          5.63%          5.60%          5.57%          5.96%
                                           ==========        ==========     ==========     ==========     ==========     ==========
Ratios and supplemental data:
   Net assets, end of period (in
     thousands).......................     $1,978,123        $1,652,323     $1,241,999     $1,123,649     $1,406,939     $1,206,041
   Ratios to average net assets
     (annualized):
       Expenses.......................           0.23%(A)          0.24%(A)       0.23%(A)       0.23%(A)       0.24%(A)       0.23%
       Net investment income..........           5.65%(A)          4.99%(A)       5.49%(A)       5.46%(A)       5.41%(A)       5.79%
</TABLE>

(A)The per share amounts and ratios reflect income and expenses assuming
   inclusion of the Fund's proportionate share of the income and expenses of the
   AMR Investment Services Money Market Portfolio.

(B)Not annualized

<TABLE>
<CAPTION>
                                                             U.S. GOVERNMENT MONEY MARKET FUND-INSTITUTIONAL CLASS
                                                 -----------------------------------------------------------------------------
                                                                                       YEAR ENDED OCTOBER 31,
                                                 TWO MONTHS ENDED      -------------------------------------------------------
FOR A SHARE OUTSTANDING THROUGHOUT THE           DECEMBER 31, 1999      1999        1998       1997(B)      1996        1995
PERIOD:                                          -----------------     -------     -------     -------     -------     -------
<S>                                              <C>                   <C>         <C>         <C>         <C>         <C>
Net asset value, beginning of period.........         $  1.00          $  1.00     $  1.00     $  1.00     $  1.00     $  1.00
                                                      -------          -------     -------     -------     -------     -------
    Net investment income....................            0.01(A)          0.05(A)     0.05(A)     0.05(A)     0.05(A)     0.06
    Less dividends from net investment
      income.................................           (0.01)           (0.05)      (0.05)      (0.05)      (0.05)      (0.06)
                                                      -------          -------     -------     -------     -------     -------
Net asset value, end of period...............         $  1.00          $  1.00     $  1.00     $  1.00     $  1.00     $  1.00
                                                      =======          =======     =======     =======     =======     =======
Total return (not annualized)................            0.94%(C)         4.94%       5.47%       5.36%       5.29%       5.67%
                                                      =======          =======     =======     =======     =======     =======
Ratios and supplemental data:
    Net assets, end of period (in
      thousands).............................         $37,385          $32,427     $39,004     $29,946     $25,595     $47,184
    Ratios to average net assets
      (annualized):
        Expenses.............................            0.18%(A)         0.19%(A)    0.30%(A)    0.27%(A)    0.32%(A)    0.32%
        Net investment income................            5.60%(A)         4.83%(A)    5.34%(A)    5.24%(A)    5.16%(A)    5.49%
</TABLE>

(A)The per share amounts and ratios reflect income and expenses assuming
   inclusion of the Fund's proportionate share of the income and expenses of the
   AMR Investment Services U.S. Government Money Market Portfolio.

(B)Prior to March 1, 1997, the U.S. Government Money Market Fund-Institutional
   Class was known as the U.S. Treasury Money Market Fund-Institutional Class
   and operated under different investment policies.

(C)Not annualized

<TABLE>
<CAPTION>
                                                                MUNICIPAL MONEY MARKET FUND-INSTITUTIONAL CLASS
                                                 -----------------------------------------------------------------------------
                                                                                       YEAR ENDED OCTOBER 31,
                                                 TWO MONTHS ENDED      -------------------------------------------------------
FOR A SHARE OUTSTANDING THROUGHOUT THE           DECEMBER 31, 1999      1999        1998        1997        1996        1995
PERIOD:                                          -----------------     -------     -------     -------     -------     -------
<S>                                              <C>                   <C>         <C>         <C>         <C>         <C>
Net asset value, beginning of period.........         $ 1.00           $  1.00     $  1.00     $  1.00     $  1.00     $  1.00
                                                      ------           -------     -------     -------     -------     -------
    Net investment income....................           0.01(A)()         0.03(A)     0.03(A)     0.04(A)     0.04(A)     0.04
    Less dividends from net investment
      income.................................          (0.01)            (0.03)      (0.03)      (0.04)      (0.04)      (0.04)
                                                      ------           -------     -------     -------     -------     -------
Net asset value, end of period...............         $ 1.00           $  1.00     $  1.00     $  1.00     $  1.00     $  1.00
                                                      ======           =======     =======     =======     =======     =======
Total return (not annualized)................           0.58%(B)          2.92%       3.46%       3.52%       3.59%       3.75%
                                                      ======           =======     =======     =======     =======     =======
Ratios and supplemental data:
    Net assets, end of period (in
      thousands).............................         $  750           $   745     $   847     $   369     $     6     $     7
    Ratios to average net assets
      (annualized):
        Expenses.............................           0.35%(A)          0.39%(A)    0.33%(A)    0.31%(A)    0.27%(A)    0.35%
        Net investment income................           3.49%(A)          2.91%(A)    3.35%(A)    3.49%(A)    3.49%(A)    3.70%
    Decrease reflected in above expense ratio
      due to absorption of expenses by the
      Manager................................             --                --          --        0.01%       0.06%       0.20%
</TABLE>

(A)The per share amounts and ratios reflect income and expenses assuming
   inclusion of the Fund's proportionate share of the income and expenses of the
   AMR Investment Services Municipal Money Market Portfolio.

(B)
  Not annualized

- --------------------------------------------------------------------------------

Additional Information                 36                             Prospectus
<PAGE>   39

                                  -- Notes --
<PAGE>   40

                                  -- Notes --
<PAGE>   41

                                  -- Notes --
<PAGE>   42

ADDITIONAL INFORMATION

Additional information about the Funds is found in the documents listed below.
Request a free copy of these documents by calling (800) 658-5811.

ANNUAL REPORT/SEMI-ANNUAL REPORT

The Funds' Annual and Semi-Annual Reports list each Fund's actual investments as
of the report's date. They also include a discussion by the Manager of market
conditions and investment strategies that significantly affected the Funds'
performance. The report of the Funds' independent auditors is included in the
Annual Report.

STATEMENT OF ADDITIONAL INFORMATION ("SAI")

The SAI contains more details about the Funds and their investment policies. The
SAI is incorporated in this Prospectus by reference (it is legally part of this
Prospectus). A current SAI is on file with the Securities and Exchange
Commission (SEC).

To obtain more information about the Funds or to request a copy of the documents
listed above:

<TABLE>
<S>                  <C>                              <C>                                     <C>
      [PHONE]                  [MAILBOX]                           [KEYBOARD]                               [MOUSE]

   By Telephone:               By Mail:                            By E-mail:
Call (800) 388-3344   American AAdvantage Funds        [email protected]             On the Internet:
                       P.O. Box 619003, MD5645                                                Visit our website at www.aafunds.com
                      DFW Airport, TX 75261-9003                                              Visit the SEC website at www.sec.gov
</TABLE>

Copies of these documents may also be obtained from the SEC Public Reference
Room by mailing a request, including a duplicating fee to: SEC's Public
Reference Section, 450 5th Street NW, Washington, D.C. 20549-6009. The Public
Reference Room can be reached at (202) 942-8090.

FUND SERVICE PROVIDERS:



<TABLE>
<S>                      <C>                          <C>                      <C>
CUSTODIAN                  TRANSFER AGENT             INDEPENDENT AUDITORS      DISTRIBUTOR
STATE STREET BANK          NATIONAL FINANCIAL         ERNST & YOUNG LLP         SWS FINANCIAL SERVICES
  AND TRUST                 DATA SERVICES             Dallas, Texas             Dallas, Texas
Boston, Massachusetts      Kansas City, Missouri
</TABLE>

                        [AMERICAN AADVANTAGE FUNDS LOGO]

                            SEC File Number 811-4984

American Airlines is not responsible for investments made in the American
AAdvantage Funds. American AAdvantage Funds is a registered service mark of AMR
Corporation. American AAdvantage Balanced Fund, American AAdvantage Large Cap
Value Fund, American AAdvantage International Equity Fund, American AAdvantage
Intermediate Bond Fund, American AAdvantage Short-Term Bond Fund, American
AAdvantage Small Cap Value Fund, American AAdvantage Money Market Fund, American
AAdvantage Municipal Money Market Fund, and American AAdvantage U.S. Government
Money Market Fund are service marks of AMR Investment Services, Inc. Russell
2000 is a registered service mark of the Frank Russell Company.

<PAGE>   43
                                PLANAHEAD CLASS


                                   [AMR LOGO]


                                   PROSPECTUS
                                 MARCH 1, 2000


                        [AMERICAN AADVANTAGE FUNDS LOGO]

EQUITY FUNDS

O    BALANCED FUND

O    LARGE CAP VALUE FUND

O    SMALL CAP VALUE FUND

O    INTERNATIONAL EQUITY FUND

O    S&P 500 INDEX FUND


BOND FUNDS

O    INTERMEDIATE BOND FUND

O    SHORT-TERM BOND FUND


MONEY MARKET FUNDS

O    MONEY MARKET FUND

O    U.S. GOVERNMENT MONEY MARKET FUND

O    MUNICIPAL MONEY MARKET FUND




The Securities and Exchange Commission does not guarantee that the information
in this Prospectus or any other mutual fund's prospectus is accurate or
complete, nor does it judge the investment merit of these Funds. To state
otherwise is a criminal offense.


<PAGE>   44

                  [AMERICAN AADVANTAGE FUNDS P.A. CLASS LOGO]

TABLE OF CONTENTS

<TABLE>
<S>                                               <C>
About the Funds
Overview........................................    2
Balanced Fund...................................    3
Large Cap Value Fund............................    6
Small Cap Value Fund............................    8
International Equity Fund.......................   10
S&P 500 Index Fund..............................   12
Intermediate Bond Fund..........................   15
Short-Term Bond Fund............................   18
Money Market Fund...............................   21
U.S. Government Money Market Fund...............   23
Municipal Money Market Fund.....................   25
The Manager.....................................   27
Equity 500 Index Portfolio Administrator........   27
The Investment Advisers.........................   27
Valuation of Shares.............................   29
About Your Investment
Purchase and Redemption of Shares...............   29
Distributions and Taxes.........................   32
Additional Information
Distribution of Trust Shares....................   33
Master-Feeder Structure.........................   33
Financial Highlights............................   33
Additional Information.....................Back Cover
</TABLE>

ABOUT THE FUNDS
- ------------------------------------------------------------

OVERVIEW

The American AAdvantage Funds (the "Funds") are managed by AMR Investment
Services, Inc. (the "Manager"), a wholly owned subsidiary of AMR Corporation.

The Funds operate under a master-feeder structure. This means that each Fund,
except for the S&P 500 Index Fund, seeks its investment objective by investing
all of its investable assets in a corresponding Portfolio of the AMR Investment
Services Trust ("AMR Trust") that has a similar name and identical investment
objective. The S&P 500 Index Fund invests all of its investable assets in the
State Street Equity 500 Index Portfolio ("Equity 500 Index Portfolio"), which is
a separate investment company with an identical investment objective, managed by
State Street Bank and Trust Company ("State Street"), through its State Street
Global Advisors division. Throughout this Prospectus, statements regarding
investments by a Fund refer to investments made by its corresponding Portfolio.
For easier reading, the term "Fund" is used throughout the Prospectus to refer
to either a Fund or its Portfolio, unless stated otherwise. See "Master-Feeder
Structure".

- --------------------------------------------------------------------------------

About the Funds                         2                             Prospectus
<PAGE>   45

AMERICAN AADVANTAGE

BALANCED FUND(SM)
- --------------------------------------------------------------------------------

Investment Objective
- -------------------------------

Income and capital appreciation.

Principal Strategies
- ------------------------------

This Fund typically invests between 50% and 65% of its total assets in equity
securities and between 35% and 50% of its total assets in debt securities.

The Fund's equity investments may include common stocks, preferred stocks,
securities convertible into common stocks, and U.S. dollar-denominated American
Depositary Receipts (collectively referred to as "stocks").

The Fund's investment advisers select stocks which, in their opinion, have most
or all of the following characteristics:

- - above-average earnings growth potential,
- - below-average price to earnings ratio,
- - below-average price to book value ratio, and
- - above-average dividend yields.

Each of the Fund's investment advisers determines the earnings growth prospects
of companies based upon a combination of internal and external research using
fundamental analysis and considering changing economic trends. The decision to
sell a stock is typically based on the belief that the company is no longer
considered undervalued or shows deteriorating fundamentals, or that better
investment opportunities exist in other stocks. The Manager believes that this
strategy will help the Fund outperform other investment styles over the longer
term while minimizing volatility and downside risk.

One of the investment advisers utilizes an "amplified alpha" approach in
determining which equity securities to buy and sell. This approach attempts to
amplify the outperformance expected from the best ideas of the other investment
advisers by concentrating assets in those stocks that are overweighted in the
aggregate of the advisers' portfolios when compared to a relevant market index.

The Fund's investments in debt securities may include: obligations of the U.S.
Government, its agencies and instrumentalities; U.S. corporate debt securities,
such as notes and bonds; mortgage-backed securities; asset-backed securities;
master-demand notes; Yankeedollar and Eurodollar bank certificates of deposit,
time deposits, bankers' acceptances, commercial paper and other notes; and other
debt securities. The Fund will only buy debt securities that are investment
grade at the time of purchase. Investment grade securities include securities
issued or guaranteed by the U.S. Government, its agencies and instrumentalities,
as well as securities rated in one of the four highest rating categories by all
nationally recognized statistical rating organizations rating that security
(such as Standard & Poor's Corporation or Moody's Investors Service, Inc.).
Obligations rated in the fourth highest rating category are limited to 25% of
the Fund's total assets. The Fund, at the discretion of the applicable
investment adviser, may retain a security that has been downgraded below the
initial investment criteria.

In determining which debt securities to buy and sell, the investment advisers
generally use a "top-down" or "bottom-up" investment strategy, or a combination
of both strategies.

The top-down fixed income investment strategy is implemented as follows:

- - Develop an overall investment strategy, including a portfolio duration target,
  by examining the current trend in the U.S. economy.
- - Set desired portfolio maturity structure by comparing the differences between
  corporate and U.S. Government securities of similar duration to judge their
  potential for optimal return in accordance with the target duration benchmark.
- - Determine the weightings of each security type by analyzing the difference in
  yield spreads between corporate and U.S. Government securities.
- - Select specific debt securities within each security type.
- - Review and monitor portfolio composition for changes in credit, risk-return
  profile and comparisons with benchmarks.

The bottom-up fixed income investment strategy is implemented as follows:

- - Search for eligible securities with a yield to maturity advantage versus a
  U.S. Government security with a similar maturity.
- - Evaluate credit quality of the securities.
- - Perform an analysis of the expected price volatility of the securities to
  changes in interest rates by examining actual price volatility between U.S.
  Government and non-U.S. Government securities.

Under adverse market conditions, the Fund may, for temporary defensive purposes,
invest up to 100% of its assets in cash or cash equivalents, including
investment grade short-term obligations. To the ex-

- --------------------------------------------------------------------------------

Prospectus                              3                        About the Funds
<PAGE>   46
AMERICAN AADVANTAGE
BALANCED FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

tent that the Fund invokes this strategy, its ability to achieve its investment
objective may be affected adversely.

Risk Factors
- -------------------

MARKET RISK (STOCKS)
Since this Fund invests a substantial portion of its assets in stocks, it is
subject to stock market risk. Market risk involves the possibility that the
value of the Fund's investments in stocks will decline due to drops in the stock
market. In general, the value of the Fund will move in the same direction as the
overall stock market, which will vary from day to day in response to the
activities of individual companies and general market and economic conditions.

INTEREST RATE RISK (BONDS)
The Fund is subject to the risk that the market value of the bonds it holds will
decline due to rising interest rates. When interest rates rise, the prices of
most bonds go down. When interest rates go down, bond prices generally go up.
The price of a bond is also affected by its maturity. Bonds with longer
maturities generally have greater sensitivity to changes in interest rates.

CREDIT RISK (BONDS)
The Fund is subject to the risk that the issuer of a bond will fail to make
timely payment of interest or principal. A decline in an issuer's credit rating
can cause its price to go down. This risk is somewhat minimized by the Fund's
policy of only investing in bonds that are considered investment grade at the
time of purchase.

PREPAYMENT RISK (BONDS)
The Fund's investments in asset-backed and mortgage-backed securities are
subject to the risk that the principal amount of the underlying collateral may
be repaid prior to the bond's maturity date. If this occurs, no additional
interest will be paid on the investment and the Fund may have to invest at a
lower rate.

ADDITIONAL RISKS
An investment in the Fund is not a deposit of a bank and is not insured or
guaranteed by the Federal Deposit Insurance Corporation or any other government
agency. The value of an investment in the Fund will fluctuate up and down. When
you sell your shares of the Fund, they could be worth less than what you paid
for them.

Investor Profile
- -----------------------

This Fund may be suitable for investors who:

- - need to fund a long-term objective, such as a child's college education or a
  comfortable retirement
- - seek a convenient way to invest in value-oriented stocks and investment grade
  bonds in a single, professionally managed portfolio
- - desire long-term performance from an investment style that may help to
  minimize volatility and downside risk
- - require investment income
- - want to take advantage of the investment expertise of value-oriented
  investment advisers

Historical Performance
- -----------------------------------

The bar chart and table below provide an indication of risk by showing how the
Fund's performance has varied from year to year. The table shows how the Fund's
performance compares to three broad-based market indices and the Lipper Balanced
Index, a composite of mutual funds with the same investment objective as the
Fund. The PlanAhead Class of the Fund began offering its shares on August 1,
1994. However, another class of shares of the Fund not offered in this
prospectus began offering its shares on July 17, 1987. In the chart and table
below, performance results before August 1, 1994 are for the older class.
Because the other class had lower expenses, its performance was better than the
PlanAhead Class of the Fund would have realized in the same period. Past
performance is not necessarily indicative of how the Fund will perform in the
future.

                                    [GRAPH]

          TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>
90..........................................................    0.29%
91..........................................................   21.22%
92..........................................................    8.97%
93..........................................................   14.46%
94..........................................................   -1.92%
95..........................................................   28.32%
96..........................................................   13.67%
97..........................................................   19.45%
98..........................................................    8.00%
99..........................................................   -4.01%
</TABLE>

<TABLE>
<S>                               <C>
Highest Quarterly Return:               9.90%
(1/1/90 through 12/31/99)         (2nd Quarter 1997)
Lowest Quarterly Return:                -7.83%
(1/1/90 through 12/31/99)         (3rd Quarter 1999)
</TABLE>

- --------------------------------------------------------------------------------

About the Funds                         4                             Prospectus
<PAGE>   47
AMERICAN AADVANTAGE
BALANCED FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                               AVERAGE ANNUAL TOTAL RETURN
                              -----------------------------
                                     AS OF 12/31/99
                              -----------------------------
                              1 YEAR    5 YEARS    10 YEARS
                              ------    -------    --------
<S>                           <C>       <C>        <C>
BALANCED FUND                 -4.01%    12.55%      10.39%
S&P/Barra Value Index(1)      12.72%    22.94%      15.36%
S&P 500 Index(2)              20.99%    28.56%      18.21%
Lehman Bros. Intermediate
  Gov./Corp. Index(3)          0.39%     7.09%       7.26%
Lipper Balanced Index          9.00%    16.33%      12.26%
</TABLE>

(1) The S&P/Barra Value Index is a market value weighted index of stocks with
    book-to-price ratios in the top 50% of the S&P 500 Index.
(2) The S&P 500 Index is an unmanaged index of common stocks publicly traded in
    the United States.
(3) The Lehman Brothers Intermediate Gov./Corp. Index is a market value weighted
    performance benchmark for government and corporate fixed-rate debt issues
    with maturities between one and ten years.

Fees and Expenses
- ----------------------------

This table describes the fees and expenses that you may pay if you buy and hold
shares of the Balanced Fund.(1)

Annual Fund Operating Expenses
(expenses that are deducted from Fund assets)

<TABLE>
<S>                                                   <C>
Management Fees                                        0.30%
Distribution (12b-1) Fees                              0.00
Other Expenses                                         0.60
                                                      -----
TOTAL ANNUAL FUND OPERATING EXPENSES                   0.90%
                                                      =====
</TABLE>

(1)   The expense table and the Example below reflect the expenses of both the
      Fund and its corresponding Portfolio.

Example
- -------------

This Example is intended to help you compare the cost of investing in the Fund
with the cost of investing in other mutual funds. The Example assumes that you
invest $10,000 in the Fund for the time periods indicated and then redeem all of
your shares at the end of those periods. The Example also assumes that your
investment has a 5% return each year and that the Fund's operating expenses
remain the same. Although your actual costs may be higher or lower, based on
these assumptions your costs would be:

<TABLE>
<S>                                         <C>
1 YEAR....................................     $92
3 YEARS...................................    $287
5 YEARS...................................    $498
10 YEARS..................................  $1,108
</TABLE>

Investment Advisers
- ----------------------------------

The Manager allocates the assets of the Fund among the following investment
advisers:

Barrow, Hanley, Mewhinney & Strauss, Inc.

Brandywine Asset Management, Inc.

Hotchkis and Wiley

Independence Investment Associates, Inc.

- --------------------------------------------------------------------------------

Prospectus                              5                        About the Funds
<PAGE>   48

AMERICAN AADVANTAGE

LARGE CAP VALUE FUND(SM)
- --------------------------------------------------------------------------------

Investment Objective
- -------------------------------

Long-term capital appreciation and current income.

Principal Strategies
- ------------------------------

Ordinarily, at least 65% of the total assets of this Fund are invested in equity
securities of U.S. companies with market capitalizations of $5 billion or more
at the time of investment. The Fund's investments may include common stocks,
preferred stocks, securities convertible into U.S. common stocks, and U.S.
dollar-denominated American Depositary Receipts (collectively referred to as
"stocks").

The Fund's investment advisers select stocks which, in their opinion, have most
or all of the following characteristics:

- - above-average earnings growth potential,
- - below-average price to earnings ratio,
- - below-average price to book value ratio, and
- - above-average dividend yields.

Each of the Fund's investment advisers determines the earnings growth prospects
of companies based upon a combination of internal and external research using
fundamental analysis and considering changing economic trends. The decision to
sell a stock is typically based on the belief that the company is no longer
considered undervalued or shows deteriorating fundamentals, or that better
investment opportunities exist in other stocks. The Manager believes that this
strategy will help the Fund outperform other investment styles over the longer
term while minimizing volatility and downside risk.

One of the investment advisers utilizes an "amplified alpha" approach in
determining which equity securities to buy and sell. This approach attempts to
amplify the outperformance expected from the best ideas of the other investment
advisers by concentrating assets in those stocks that are overweighted in the
aggregate of the advisers' portfolios when compared to a relevant market index.

Under adverse market conditions, the Fund may, for temporary defensive purposes,
invest up to 100% of its assets in cash or cash equivalents, including
investment grade short-term obligations. To the extent that the Fund invokes
this strategy, its ability to achieve its investment objective may be affected
adversely.

Risk Factors
- -------------------

MARKET RISK
Since this Fund invests most of its assets in stocks, it is subject to stock
market risk. Market risk involves the possibility that the value of the Fund's
investments in stocks will decline due to drops in the stock market. In general,
the value of the Fund will move in the same direction as the overall stock
market, which will vary from day to day in response to the activities of
individual companies and general market and economic conditions.

ADDITIONAL RISKS
An investment in the Fund is not a deposit of a bank and is not insured or
guaranteed by the Federal Deposit Insurance Corporation or any other government
agency. The value of an investment in the Fund will fluctuate up and down. When
you sell your shares of the Fund, they could be worth less than what you paid
for them.

Investor Profile
- -----------------------

This Fund may be suitable for investors who:

- - need to fund a long-term objective, such as a child's college education or a
  comfortable retirement
- - seek a U.S. stock mutual fund that invests in fundamentally strong companies
- - require total returns including income
- - want to take advantage of the expertise of value-oriented investment advisers

Historical Performance
- -----------------------------------

The bar chart and table below provide an indication of risk by showing how the
Fund's performance has varied from year to year. The table shows how the Fund's
performance compares to the S&P/Barra Value Index, a market value weighted index
of stocks with book-to-price ratios in the top 50% of the S&P 500 Index; the S&P
500 Index, a widely recognized unmanaged index of common stocks publicly traded
in the U.S.; and the Lipper Multi-Cap Value Index, a composite of mutual funds
with the same investment objective as the Fund. The PlanAhead Class of the Fund
began offering its shares on August 1, 1994. However, another class of shares of
the Fund not offered in this prospectus began offering its shares on July 17,
1987. In the chart and table below, performance results before August 1, 1994

- --------------------------------------------------------------------------------

About the Funds                         6                             Prospectus
<PAGE>   49
AMERICAN AADVANTAGE
LARGE CAP VALUE FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

are for the older class. Because the other class had lower expenses, its
performance was better than the PlanAhead Class of the Fund would have realized
in the same period. Past performance is not necessarily indicative of how the
Fund will perform in the future.

                                    [GRAPH]

          TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>
90..........................................................   -5.97%
91..........................................................   26.00%
92..........................................................   11.90%
93..........................................................   15.74%
94..........................................................   -1.26%
95..........................................................   33.69%
96..........................................................   20.74%
97..........................................................   26.08%
98..........................................................    5.88%
99..........................................................   -4.99%
</TABLE>

<TABLE>
<S>                              <C>
Highest Quarterly Return:              13.98%
  (1/1/90 through 12/31/99)      (2nd Quarter 1997)
Lowest Quarterly Return:               -14.11%
  (1/1/90 through 12/31/99)      (3rd Quarter 1998)
</TABLE>

<TABLE>
<CAPTION>
                               AVERAGE ANNUAL TOTAL RETURN
                              -----------------------------
                                     AS OF 12/31/99
                              -----------------------------
                              1 YEAR    5 YEARS    10 YEARS
                              ------    -------    --------
<S>                           <C>       <C>        <C>
LARGE CAP VALUE FUND          -4.99%    15.41%      11.99%
S&P/Barra Value Index         12.72%    22.94%      15.36%
S&P 500 Index                 20.99%    28.56%      18.21%
Lipper Multi-Cap Value
  Index(1)                     5.94%    17.82%      13.03%
</TABLE>

(1)   On September 1, 1999, Lipper reclassified the Fund from the Lipper Growth
      and Income Index to the Lipper Multi-Cap Value Index.

Fees and Expenses
- ----------------------------

This table describes the fees and expenses that you may pay if you buy and hold
shares of the Large Cap Value Fund.(1)

Annual Fund Operating Expenses
(expenses that are deducted from Fund assets)

<TABLE>
<S>                                                   <C>
Management Fees                                       0.30%
Distribution (12b-1) Fees                             0.00
Other Expenses                                        0.60
                                                      ----
TOTAL ANNUAL FUND OPERATING EXPENSES                  0.90%
                                                      ====
</TABLE>

(1)   The expense table and the Example below reflect the expenses of both the
      Fund and its corresponding Portfolio.

Example
- -------------
This Example is intended to help you compare the cost of investing in the Fund
with the cost of investing in other mutual funds. The Example assumes that you
invest $10,000 in the Fund for the time periods indicated and then redeem all of
your shares at the end of those periods. The Example also assumes that your
investment has a 5% return each year and that the Fund's operating expenses
remain the same. Although your actual costs may be higher or lower, based on
these assumptions your costs would be:

<TABLE>
<S>                                       <C>
1 YEAR .................................     $92
3 YEARS.................................    $287
5 YEARS.................................    $498
10 YEARS................................  $1,108
</TABLE>

Investment Advisers
- ----------------------------------

The Manager allocates the assets of the Fund among the following investment
advisers:

Barrow, Hanley, Mewhinney & Strauss, Inc.

Brandywine Asset Management, Inc.

Hotchkis and Wiley

Independence Investment Associates, Inc.

- --------------------------------------------------------------------------------

Prospectus                              7                        About the Funds
<PAGE>   50

AMERICAN AADVANTAGE

SMALL CAP VALUE FUND(SM)
- --------------------------------------------------------------------------------

Investment Objective
- -------------------------------

Long-term capital appreciation and current income.

Principal Strategies
- ------------------------------

Ordinarily at least 80% of the total assets of the Fund are invested in equity
securities of U.S. companies with market capitalizations of $1 billion or less
at the time of investment. The Fund's investments may include common stocks,
preferred stocks, securities convertible into common stocks, and U.S. dollar-
denominated American Depositary Receipts (collectively, "stocks").

The investment advisers select stocks which, in their opinion, have most or all
of the following characteristics:

- - above-average earnings growth potential,
- - below-average price to earnings ratio,
- - below-average price to book value ratio, and
- - above-average dividend yields.

Each of the investment advisers determines the earnings growth prospects of
companies based upon a combination of internal and external research using
fundamental analysis and considering changing economic trends. The decision to
sell a stock is typically based on the belief that the company is no longer
considered undervalued or shows deteriorating fundamentals, or that better
investment opportunities exist in other stocks. The Manager believes that this
strategy will help the Fund outperform other investment styles over the longer
term while minimizing volatility and downside risk.

Under adverse market conditions, the Fund may, for temporary defensive purposes,
invest up to 100% of its assets in cash or cash equivalents, including
investment grade short-term obligations. To the extent that the Fund invokes
this strategy, its ability to achieve its investment objective may be affected
adversely.

Risk Factors
- -------------------

MARKET RISK
Since this Fund invests most of its assets in stocks, it is subject to stock
market risk. Market risk involves the possibility that the value of the Fund's
investments in stocks will decline due to drops in the stock market. In general,
the value of the Fund will move in the same direction as the overall stock
market, which will vary from day to day in response to the activities of
individual companies and general market and economic conditions.

SMALL CAPITALIZATION COMPANIES
Investing in the securities of small capitalization companies involves greater
risk and the possibility of greater price volatility than investing in larger
capitalization and more established companies, since smaller companies may have
limited operating history, product lines, and financial resources, and the
securities of these companies may lack sufficient market liquidity.

ADDITIONAL RISKS
An investment in the Fund is not a deposit of a bank and is not insured or
guaranteed by the Federal Deposit Insurance Corporation or any other government
agency. The value of an investment in the Fund will fluctuate up and down. When
you sell your shares of the Fund, they could be worth less than what you paid
for them.

Investor Profile
- -----------------------

This Fund may be suitable for investors who:

- - need to fund a long-term objective, such as a child's education or a
  comfortable retirement
- - seek a U.S. stock mutual fund that invests in small, less well-known companies
- - want to take advantage of the expertise of value-oriented investment advisers
- - are willing to accept the increased risks of small stock investing

Historical Performance
- -----------------------------------

The bar chart and table below provide an indication of risk by showing how the
Fund has performed during the past year. The table shows how the Fund's
performance compares to the Russell 2000(R) Value Index, an unmanaged index of
those stocks in the Russell 2000 Index with below-average price-to-book ratios
and below-average forecasted growth values, and the Lipper Small Cap Value
Index, a composite of mutual funds with the same investment objective as the
Fund. The PlanAhead Class of the Fund began offering its shares on March 1,
1999. However, another class of shares of the Fund not offered in this
prospectus began offering its shares on January 1, 1999. In the chart and table
below, performance results before March 1, 1999 are for the older class. Because
the other class had lower ex-

- --------------------------------------------------------------------------------

About the Funds                         8                             Prospectus
<PAGE>   51
AMERICAN AADVANTAGE
SMALL CAP VALUE FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

penses, its performance was better than the PlanAhead Class of the Fund would
have realized in the same period. Past performance is not necessarily indicative
of how the Fund will perform in the future.

                                    [GRAPH]

               TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31/99

<TABLE>
<S>                                                           <C>
99..........................................................  -5.01%
</TABLE>

<TABLE>
<S>                         <C>
Highest Quarterly Return:         19.78%
  (1/1/99 through
    12/31/99)               (2nd Quarter 1999)
Lowest Quarterly Return:         -11.38%
  (1/1/99 through
    12/31/99)               (3rd Quarter 1999)
</TABLE>

<TABLE>
<CAPTION>
                               AVERAGE ANNUAL TOTAL RETURN
                               ---------------------------
                                     AS OF 12/31/99
                               ---------------------------
                                         1 YEAR
                               ---------------------------
<S>                            <C>
SMALL CAP VALUE FUND                     -5.01%
Russell 2000 Value Index                 -1.49%
Lipper Small Cap Value Index              1.31%
</TABLE>

Fees and Expenses
- ----------------------------

This table describes the fees and expenses that you may pay if you buy and hold
shares of the Small Cap Value Fund.(1)

Annual Fund Operating Expenses
(expenses that are deducted from Fund assets)

<TABLE>
<S>                                                   <C>
Management Fees                                       0.67%
Distribution (12b-1) Fees                             0.00
Other Expenses                                        0.79
                                                      ----
Total Annual Fund Operating Expenses                  1.46%
                                                      ====
Fee Waiver and/or Expense Reimbursement               0.18(2)
NET EXPENSES                                          1.28%
</TABLE>

(1)   The expense table and the Example below reflect the expenses of both the
      Fund and its corresponding Portfolio.
(2)   The Manager has contractually agreed to reimburse the Fund for Other
      Expenses through October 31, 2000 to the extent that Total Annual Fund
      Operating Expenses exceed 1.28%.

<TABLE>
<S> <C>                                              <C>
Example
- --------------------------------------------------------
This Example is intended to help you compare the cost of
investing in the Fund with the cost of investing in
other mutual funds. The Example assumes that you invest
$10,000 in the Fund for the time periods indicated and
then redeem all of your shares at the end of those
periods. The Example also assumes that your investment
has a 5% return each year and that the Fund's operating
expenses remain the same. Because the Manager's expense
reimbursement is only guaranteed through October 31,
2000, net expenses are used to calculate costs in year
one, and total fund expenses are used to calculate costs
in years two through ten. Although your actual costs may
be higher or lower, based on these assumptions your
costs would be:
1 YEAR .............................................$130
3 YEARS.............................................$444
5 YEARS.............................................$780
10 YEARS..........................................$1,731
</TABLE>

Investment Advisers
- ----------------------------------

The Manager allocates the assets of the Fund among the following investment
advisers:

Brandywine Asset Management, Inc.

Hotchkis and Wiley

- --------------------------------------------------------------------------------

Prospectus                              9                        About the Funds
<PAGE>   52

AMERICAN AADVANTAGE

INTERNATIONAL EQUITY FUND(SM)
- --------------------------------------------------------------------------------

Investment Objective
- -------------------------------

Long-term capital appreciation.

Principal Strategies
- ------------------------------

Under normal circumstances, at least 80% of the Fund's total assets are invested
in common stocks and securities convertible into common stocks (collectively,
"stocks") of issuers based in at least three different countries located outside
the United States.

The current countries in which the Fund may invest are:

<TABLE>
<S>        <C>        <C>          <C>
Australia  France     Mexico       South Korea
Austria    Germany    Netherlands  Spain
Belgium    Hong Kong  New Zealand  Sweden
Canada     Ireland    Norway       Switzerland
Denmark    Italy      Portugal     United Kingdom
Finland    Japan      Singapore
</TABLE>

The investment advisers select stocks which, in their opinion, have most or all
of the following characteristics:

- - above-average earnings growth potential,
- - below-average price to earnings ratio,
- - below-average price to book value ratio, and
- - above-average dividend yields.

The investment advisers may also consider potential changes in currency exchange
rates when choosing stocks. Each of the investment advisers determines the
earnings growth prospects of companies based upon a combination of internal and
external research using fundamental analysis and considering changing economic
trends. The decision to sell a stock is typically based on the belief that the
company is no longer considered undervalued or shows deteriorating fundamentals,
or that better investment opportunities exist in other stocks. The Manager
believes that this strategy will help the Fund outperform other investment
styles over the longer term while minimizing volatility and downside risk. The
Fund may trade forward foreign currency contracts or currency futures to hedge
currency fluctuations of underlying stock positions when it is believed that a
foreign currency may suffer a decline against the U.S. dollar.

One of the investment advisers utilizes an "amplified alpha" approach in
determining which equity securities to buy and sell. This approach attempts to
amplify the outperformance expected from the best ideas of the other investment
advisers by concentrating assets in those stocks that are overweighted in the
aggregate of the advisers' portfolios when compared to a relevant market index.

Under adverse market conditions, the Fund may, for temporary defensive purposes,
invest up to 100% of its assets in cash or cash equivalents, including
investment grade short-term obligations. To the extent that the Fund invokes
this strategy, its ability to achieve its investment objective may be affected
adversely.

Risk Factors
- -------------------

MARKET RISK
Since this Fund invests most of its assets in stocks, it is subject to stock
market risk. Market risk involves the possibility that the value of the Fund's
investments in stocks of a particular country will decline due to drops in that
country's stock market. In general, the value of the Fund will move in the same
direction as the international stock market it invests in, which will vary from
day to day in response to the activities of individual companies and general
market and economic conditions of that country.

FOREIGN INVESTING
Overseas investing carries potential risks not associated with domestic
investments. Such risks include, but are not limited to: (1) currency exchange
rate fluctuations; (2) political and financial instability; (3) less liquidity
and greater volatility of foreign investments; (4) lack of uniform accounting,
auditing and financial reporting standards; (5) less government regulation and
supervision of foreign stock exchanges, brokers and listed companies; (6)
increased price volatility; (7) delays in transaction settlement in some foreign
markets; and (8) adverse impact of the euro conversion on the business or
financial condition of companies in which the Fund is invested.

ADDITIONAL RISKS
An investment in the Fund is not a deposit of a bank and is not insured or
guaranteed by the Federal Deposit Insurance Corporation or any other government
agency. The value of an investment in the Fund will fluctuate up and down. When
you sell your shares of the Fund, they could be worth less than what you paid
for them.

Investor Profile
- -----------------------

This Fund may be appropriate for investors who:

- - need to fund a long-term objective that requires growth of capital, such as a
  child's college education or a comfortable retirement

- --------------------------------------------------------------------------------

About the Funds                        10                             Prospectus
<PAGE>   53
AMERICAN AADVANTAGE
INTERNATIONAL EQUITY FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

- - seek to complement U.S. stock holdings with an international stock mutual fund
  that invests in large, well-capitalized foreign companies
- - want to take advantage of the expertise of leading international equity
  investment advisers
- - are willing to accept the increased risks of international investing,
  including currency and exchange rate risks, accounting differences and
  political risks
Historical Performance
- -----------------------------------
The bar chart and table below provide an indication of risk by showing how the
Fund's performance has varied from year to year. The table shows how the Fund's
performance compares to the Morgan Stanley Europe Australasia Far East ("EAFE")
Index, a widely recognized unmanaged index of international stock investment
performance, and the Lipper International Index, a composite of mutual funds
with the same investment objective as the Fund. The PlanAhead Class of the Fund
began offering its shares on August 1, 1994. However, another class of shares of
the Fund not offered in this prospectus began offering its shares on August 7,
1991. In the chart and table below, performance results before August 1, 1994
are for the older class. Because the other class had lower expenses, its
performance was better than the PlanAhead Class of the Fund would have realized
in the same period. Past performance is not necessarily indicative of how the
Fund will perform in the future.

                                    [GRAPH]

          TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>
92..........................................................  -11.03%
93..........................................................   42.33%
94..........................................................    0.76%
95..........................................................   17.20%
96..........................................................   19.33%
97..........................................................    9.26%
98..........................................................   11.52%
99..........................................................   26.52%
</TABLE>

<TABLE>
<S>                             <C>
Highest Quarterly Return:             15.15%
  (1/1/92 through 12/31/99)     (4th Quarter 1998)
Lowest Quarterly Return:             -15.69%
  (1/1/92 through 12/31/99)     (3rd Quarter 1998)
</TABLE>

<TABLE>
<CAPTION>
                              AVERAGE ANNUAL TOTAL RETURN
                             ------------------------------
                                     AS OF 12/31/99
                             ------------------------------
                                                    SINCE
                                                  INCEPTION
                             1 YEAR    5 YEARS    (8/7/91)
                             ------    -------    ---------
<S>                          <C>       <C>        <C>
INTERNAT'L. EQUITY FUND      26.52%    16.61%      13.10%
EAFE Index                   26.96%    12.83%      11.01%
Lipper International Index   37.83%    15.96%      13.37%
</TABLE>

Fees and Expenses
- ----------------------------

This table describes the fees and expenses that you pay if you buy and hold
shares of the International Equity Fund.(1)

Annual Fund Operating Expenses
(expenses that are deducted from Fund assets)

<TABLE>
<S>                                                    <C>
Management Fees                                        0.36%
Distribution (12b-1) Fees                              0.00
Other Expenses                                         0.65(2)
                                                       ----
TOTAL ANNUAL FUND OPERATING EXPENSES                   1.01%
                                                       ====
</TABLE>

(1)   The expense table and the Example below reflect the expenses of both the
      Fund and its corresponding Portfolio.
(2)   Other Expenses reflects current fees.

<TABLE>
<S> <C>                                              <C>
Example
- --------------------------------------------------------
This Example is intended to help you compare the cost of
investing in the Fund with the cost of investing in
other mutual funds. The Example assumes that you invest
$10,000 in the Fund for the time periods indicated and
then redeem all of your shares at the end of those
periods. The Example also assumes that your investment
has a 5% return each year and that the Fund's operating
expenses remain the same. Although your actual costs may
be higher or lower, based on these assumptions your
costs would be:
    1 YEAR .....................................$103
    3 YEARS.....................................$322
    5 YEARS.....................................$558
    10 YEARS..................................$1,236
</TABLE>

Investment Advisers
- ----------------------------------

The Manager allocates the assets of the Fund among the following investment
advisers:

Hotchkis and Wiley

Independence Investment Associates, Inc.

Lazard Asset Management

Templeton Investment Counsel, Inc.

- --------------------------------------------------------------------------------

Prospectus                             11                        About the Funds
<PAGE>   54

AMERICAN AADVANTAGE

S&P 500 INDEX FUND(1)
- --------------------------------------------------------------------------------

Investment Objective
- -------------------------------

To replicate as closely as possible, before expenses, the performance of the
Standard & Poor's 500 Composite Stock Price Index ("S&P 500 Index" or "Index").

Principal Strategies
- ------------------------------

The Fund uses a passive management strategy designed to track the performance of
the S&P 500 Index. The S&P 500 Index is a well-known stock market index that
includes common stocks of 500 companies from several industrial sectors
representing a significant portion of the market value of all stocks publicly
traded in the United States.

The Fund is not managed according to traditional methods of "active" investment
management, which involve the buying and selling of securities based upon
economic, financial and market analysis and investment judgement. Instead, the
Fund, using a "passive" or "indexing" investment approach, attempts to
replicate, before expenses, the performance of the S&P 500 Index. State Street,
through its State Street Global Advisors division, seeks a correlation of 0.95
or better between the Fund's performance and the performance of the Index; a
figure of 1.00 would represent perfect correlation.

The Fund intends to invest in all 500 stocks comprising the Index in proportion
to their weightings in the Index. However, under various circumstances, it may
not be possible or practicable to purchase all 500 stocks in those weightings.
In those circumstances, the Fund may purchase a sample of the stocks in the
Index in proportions expected by State Street to replicate generally the
performance of the Index as a whole. In addition, from time to time stocks are
added to or removed from the Index. The Fund may sell stocks that are
represented in the Index, or purchase stocks that are not yet represented in the
Index, in anticipation of their removal from or addition to the Index.

In addition, the Fund may at times purchase or sell futures contracts on the
Index, or options on those futures, in lieu of investment directly in the stocks
making up the Index. The Fund might do so, for example, in order to increase its
investment exposure pending investment of cash in the stocks comprising the
Index. Alternatively, the Fund might use futures or options on futures to reduce
its investment exposure in situations where it intends to sell a portion of the
stocks in its portfolio but the sale has not yet been completed. The Fund may
also enter into other derivatives transactions, including the purchase or sale
of options or enter into swap transactions, to assist in replicating the
performance of the Index.

Risk Factors
- -------------------

MARKET RISK
Stock values could decline generally or could underperform other investments. In
addition, returns on investments in stocks of large U.S. companies could trail
the returns on investments in stocks of smaller companies.

TRACKING ERROR RISK
The Fund's return may not match the return of the Index for a number of reasons.
For example, the Fund incurs a number of operating expenses not applicable to
the Index, and incurs costs in buying and selling securities. The Fund may not
be fully invested at times, either as a result of cash flows into the Fund or
reserves of cash held by the fund to meet redemptions. The return on the sample
of stocks purchased by the Fund, or futures or other derivative positions taken
by the Fund, to replicate the performance of the Index may not correlate
precisely with the return on the Index.

DERIVATIVES
The use of these instruments to pursue the S&P 500 Index returns requires
special skills, knowledge and investment techniques that differ from those
required for normal portfolio management. Gains or losses from positions in a
derivative instrument may be much greater than the derivative's original cost.

ADDITIONAL RISKS
An investment in the Fund is not a deposit with a bank and is not insured or
guaranteed by the Federal Deposit Insurance Corporation or any other government
agency. The value of an investment in the Fund will fluctuate up and down. When
you sell your

- ---------------

(1)  S&P is a trademark of The McGraw-Hill Companies, Inc. and has been licensed
     for use. "Standard and Poor's(R)," "S&P(R)," "Standard & Poor's 500," "S&P
     500(R)" and "500" are all trademarks of The McGraw-Hill Companies, Inc. and
     have been licensed for use by State Street Bank and Trust Company. The S&P
     500 Index Fund is not sponsored, sold or promoted by Standard & Poor's, and
     Standard & Poor's makes no representation regarding the advisability of
     investing in this Fund.

- --------------------------------------------------------------------------------

About the Funds                        12                             Prospectus
<PAGE>   55
AMERICAN AADVANTAGE
S&P 500 INDEX FUND -- (CONTINUED)
- --------------------------------------------------------------------------------

shares of the Fund, they could be worth less than what you paid for them.

Investor Profile
- -----------------------

This Fund may be appropriate for investors who:

- - need to fund a long-term objective, such as a child's college education or a
  comfortable retirement
- - seek a stock mutual fund that reflects the performance of publicly traded U.S.
  stocks in general
- - want to take advantage of a "passive," indexing investment approach

Historical Performance
- -----------------------------------

The bar chart and table below provide an indication of risk by showing how the
Fund's performance has varied from year to year. The table shows how the Fund's
performance compares to the S&P 500 Index, a widely recognized unmanaged index
of common stocks publicly traded in the United States, and the Lipper S&P 500
Index, a composite of funds with the same investment objective as the Fund. The
PlanAhead Class of the Fund began offering its shares on March 1, 1998. However,
another class of shares of the Fund not offered in this prospectus began
offering its shares on January 1, 1997. In the chart and table below,
performance results before March 1, 1998 are for the older class. Because the
other class had lower expenses, its performance was better than the PlanAhead
Class of the Fund would have realized in the same period. Prior to March 1,
2000, the Fund invested all of its investable assets in the BT Equity 500 Index
Portfolio, a separate investment company managed by Bankers Trust Company. Past
performance is not necessarily indicative of how the Fund will perform in the
future.

                                    [GRAPH]

TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>
97..........................................................  33.09%
98..........................................................  28.58%
99..........................................................  20.24%
</TABLE>

<TABLE>
<S>                               <C>
Highest Quarterly Return:               21.15%
  (1/1/97 through 12/31/99)       (4th Quarter 1998)
Lowest Quarterly Return:                -9.78%
  (1/1/97 through 12/31/99)       (3rd Quarter 1998)
</TABLE>

<TABLE>
<CAPTION>
                                       AVERAGE ANNUAL
                                        TOTAL RETURN
                                  -------------------------
                                       AS OF 12/31/99
                                  -------------------------
                                            SINCE INCEPTION
                                  1 YEAR      (12/31/96)
                                  ------    ---------------
<S>                               <C>       <C>
S&P 500 INDEX FUND                20.24%        27.19%
S&P 500 Index                     20.99%        27.56%
Lipper S&P 500 Index              20.62%        27.24%
</TABLE>

Fees and Expenses
- ----------------------------

This table describes the fees and expenses that you may pay if you buy and hold
shares of the S&P 500 Index Fund.(1)

Annual Fund Operating Expenses
(expenses that are deducted from Fund assets)

<TABLE>
<S>                                                 <C>
Management Fees                                     0.045%(2)
Distribution (12b-1) Fees                            0.00
Other Expenses                                      0.625
                                                    -----
Total Annual Fund Operating Expenses                 0.67%
                                                    =====
Fee Waiver and/or Expense Reimbursement              0.12%(3)
NET EXPENSES                                         0.55%
</TABLE>

(1)   The expense table and the Example below reflect the expenses of both the
      Fund and the State Street Equity 500 Index Portfolio.

(2)   Management Fees reflects current fees.

(3)   The Manager has contractually agreed to reimburse the Fund for Other
      Expenses through October 31, 2000 to the extent that Total Annual Fund
      Operating Expenses exceed 0.55%.

- --------------------------------------------------------------------------------

Prospectus                             13                        About the Funds
<PAGE>   56
AMERICAN AADVANTAGE
S&P 500 INDEX FUND -- (CONTINUED)
- --------------------------------------------------------------------------------

<TABLE>
<S> <C>                                              <C>
Example
- --------------------------------------------------------
This Example is intended to help you compare the cost of
investing in the Fund with the cost of investing in
other mutual funds. The Example assumes that you invest
$10,000 in the Fund for the time periods indicated and
then redeem all of your shares at the end of those
periods. The Example also assumes that your investment
has a 5% return each year and that the Fund's operating
expenses remain the same. Because the Manager's expense
reimbursement is only guaranteed through October 31,
2000, net expenses are used to calculate costs in year
one, and total fund expenses are used to calculate costs
in years two through ten. Although your actual costs may
be higher or lower, based on these assumptions your
costs would be:
    1 YEAR ......................................$56
    3 YEARS.....................................$202
    5 YEARS.....................................$361
    10 YEARS....................................$823
</TABLE>

Investment Adviser
- -----------------------------

State Street Bank and Trust Company

- --------------------------------------------------------------------------------

About the Funds                        14                             Prospectus
<PAGE>   57

AMERICAN AADVANTAGE

INTERMEDIATE BOND FUND(SM)
- --------------------------------------------------------------------------------

Investment Objective
- -------------------------------

Income and capital appreciation.

Principal Strategies
- ------------------------------

The Fund invests in obligations of the U.S. Government, its agencies and
instrumentalities; corporate debt securities, such as commercial paper, master
demand notes, loan participation interests, medium-term notes and funding
agreements; mortgage-backed securities; asset-backed securities; and
Yankeedollar and Eurodollar bank certificates of deposit, time deposits,
bankers' acceptances and other notes. As an investment policy, the Fund
primarily seeks income and secondarily seeks capital appreciation. The Fund
seeks capital appreciation by investing in corporate issues whose relative value
is expected to increase over time.

The Fund will only buy debt securities that are investment grade at the time of
purchase. Investment grade securities include securities issued or guaranteed by
the U.S. Government, its agencies and instrumentalities, as well as securities
rated in one of the four highest rating categories by all rating organizations
rating the securities (such as Standard & Poor's Corporation or Moody's
Investors Service, Inc.). No more than 25% of total assets may be invested in
securities rated in the fourth highest rating category. The Fund, at the
discretion of the applicable investment adviser, may retain a security that has
been downgraded below the initial investment criteria.

In determining which securities to buy and sell, the Manager employs a top-down
fixed income investment strategy, as follows:

- - Develop an overall investment strategy, including a portfolio duration target,
  by examining the current trend in the U.S. economy.
- - Set desired portfolio maturity structure by comparing the differences between
  corporate and U.S. Government securities of similar duration to judge their
  potential for optimal return in accordance with the target duration benchmark.
- - Determine the weightings of each security type by analyzing the difference in
  yield spreads between corporate and U.S. Government securities.
- - Select specific debt securities within each security type.
- - Review and monitor portfolio composition for changes in credit, risk-return
  profile and comparisons with benchmarks.

The other investment adviser to the Fund uses a bottom-up fixed income
investment strategy in determining which securities to buy and sell, as follows:

- - Search for eligible securities with a yield to maturity advantage versus a
  U.S. Government security with a similar maturity.
- - Evaluate credit quality of the securities.
- - Perform an analysis of the expected price volatility of the securities to
  changes in interest rates by examining actual price volatility between U.S.
  Government and non-U.S. Government securities.

Under normal circumstances, the Fund seeks to maintain a duration of three to
seven years. Duration is a measure of price sensitivity relative to changes in
interest rates. Portfolios with longer durations are typically more sensitive to
changes in interest rates. Under adverse market conditions, the Fund may, for
temporary defensive purposes, invest up to 100% of its assets in cash or cash
equivalents, including investment grade short-term debt obligations. To the
extent that the Fund invokes this strategy, its ability to achieve its
investment objective may be affected adversely.

Risk Factors
- -------------------

INTEREST RATE RISK
The Fund is subject to the risk that the market value of the bonds it holds will
decline due to rising interest rates. When interest rates rise, the prices of
most bonds go down. When interest rates go down, bond prices generally go up.
The price of a bond is also affected by its maturity. Bonds with longer
maturities generally have greater sensitivity to changes in interest rates.

CREDIT RISK
The Fund is subject to the risk that the issuer of a bond will fail to make
timely payment of interest or principal. A decline in an issuer's credit rating
can cause its price to go down. This risk is somewhat minimized by the Fund's
policy of only investing in bonds that are considered investment grade at the
time of purchase.

PREPAYMENT RISK
The Fund's investments in asset-backed and mortgage-backed securities are
subject to the risk that the

- --------------------------------------------------------------------------------

Prospectus                             15                        About the Funds
<PAGE>   58
AMERICAN AADVANTAGE
INTERMEDIATE BOND FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

principal amount of the underlying collateral may be repaid prior to the bond's
maturity date. If this occurs, no additional interest will be paid on the
investment and the Fund may have to invest at a lower rate.

ADDITIONAL RISKS
An investment in the Fund is not a deposit of a bank and is not insured or
guaranteed by the Federal Deposit Insurance Corporation or any other government
agency. The value of an investment in the Fund will fluctuate up and down. When
you sell your shares of the Fund, they could be worth less than what you paid
for them.

Investor Profile
- -----------------------

This Fund may be appropriate for investors who:

- - seek regular monthly income for retirement or other current expenses
- - want the relative stability of investment grade bonds
- - can benefit from a diversified portfolio of fixed income securities
- - wish to complement their equity holdings

Historical Performance
- -----------------------------------

The bar chart and table below provide an indication of risk by showing how the
Fund has performed during the past two years. The table shows how the Fund's
performance compares to the Lehman Brothers Intermediate Gov./Corp. and
Aggregate Indexes, two broad-based market indices, and the Lipper Intermediate
Investment Grade Debt Average and Index, composites of mutual funds with the
same investment objective as the Fund. The PlanAhead Class of the Fund began
offering its shares on March 2, 1998. However, another class of shares of the
Fund not offered in this prospectus began offering its shares on September 15,
1997. In the chart and table below, performance results before March 2, 1998 are
for the older class. Because the other class had lower expenses, its performance
was better than the PlanAhead Class of the Fund would have realized in the same
period. Past performance is not necessarily indicative of how the Fund will
perform in the future.

                                    [GRAPH]

          TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>

98..........................................................    8.32%
99..........................................................   -2.39%
</TABLE>

<TABLE>
<S>                            <C>
Highest Quarterly Return:            4.53%
  (1/1/98 through 12/31/99)    (3rd Quarter 1998)
Lowest Quarterly Return:             -1.41%
  (1/1/98 through 12/31/99)    (2nd Quarter 1999)
</TABLE>

<TABLE>
<CAPTION>
                                          AVERAGE ANNUAL
                                           TOTAL RETURN
                                        ------------------
                                          AS OF 12/31/99
                                        ------------------
                                                   SINCE
                                                 INCEPTION
                                        1 YEAR   (9/15/97)
                                        ------   ---------
<S>                                     <C>      <C>
INTERMEDIATE BOND FUND                  -2.39%    4.34%
Lehman Bros. Aggregate Index(2)         -0.83%   5.21%(1)
Lehman Bros. Intermediate Gov./Corp.
  Index(3)                              0.39 %   5.16%(1)
Lipper Intermediate Investment Grade
  Debt Index(4)                         -1.00%   4.40%(1)
Lipper Intermediate Investment Grade
  Debt Average                          -1.31%   4.16%(1)
</TABLE>

(1)   The since inception return is shown from 8/31/97.

(2)   The Lehman Brothers Aggregate Index is a market value weighted performance
      benchmark for government, corporate, mortgage-backed and asset-backed
      fixed-rate debt securities of all maturities. As of March 1, 2000, this
      Index has replaced the Lehman Bros. Intermediate Gov./Corp. Index as the
      Fund's market index, because it better reflects the principal strategies
      of the Fund.

(3)   The Lehman Bros. Intermediate Gov./Corp. Index is a market value weighted
      performance benchmark for government and corporate fixed-rate debt
      securities with maturities between one and ten years.

(4)   As of March 1, 2000, the Fund's investment advisers have designated this
      Index of 30 funds as the Fund's performance benchmark, replacing the
      Lipper Intermediate Investment Grade Debt Average.

- --------------------------------------------------------------------------------

About the Funds                        16                             Prospectus
<PAGE>   59
AMERICAN AADVANTAGE
INTERMEDIATE BOND FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

Fees and Expenses
- ----------------------------

This table describes the fees and expenses that you may pay if you buy and hold
shares of the Intermediate Bond Fund.(1)

Annual Fund Operating Expenses
(expenses that are deducted from Fund assets)

<TABLE>
<S>                                                   <C>
Management Fees                                       0.25%
Distribution (12b-1) Fees                             0.00
Other Expenses                                        0.60
                                                      ----
TOTAL ANNUAL FUND OPERATING EXPENSES                  0.85%
                                                      ====
</TABLE>

(1)   The expense table and the Example below reflect the expenses of both the
      Fund and its corresponding Portfolio.

<TABLE>
<S> <C>                                              <C>
Example
- --------------------------------------------------------
This Example is intended to help you compare the cost of
investing in the Fund with the cost of investing in
other mutual funds. The Example assumes that you invest
$10,000 in the Fund for the time periods indicated and
then redeem all of your shares at the end of those
periods. The Example also assumes that your investment
has a 5% return each year and that the Fund's operating
expenses remain the same. Although your actual costs may
be higher or lower, based on these assumptions your
costs would be:
    1 YEAR ......................................$87
    3 YEARS.....................................$271
    5 YEARS.....................................$471
    10 YEARS..................................$1,049
</TABLE>

Investment Advisers
- ----------------------------------

The Manager allocates the assets of the Fund among the following investment
advisers:

AMR Investment Services, Inc.

Barrow, Hanley, Mewhinney & Strauss, Inc.

- --------------------------------------------------------------------------------

Prospectus                             17                        About the Funds
<PAGE>   60

AMERICAN AADVANTAGE

SHORT-TERM BOND FUND(SM)
- --------------------------------------------------------------------------------

Investment Objective
- -------------------------------

Income and capital appreciation.

Principal Strategies
- ------------------------------

The Fund invests in obligations of the U.S. Government, its agencies and
instrumentalities; corporate debt securities, such as commercial paper, master
demand notes, loan participation interests, medium-term notes and funding
agreements; mortgage-backed securities; asset-backed securities; and
Yankeedollar and Eurodollar bank certificates of deposit, time deposits,
bankers' acceptances and other notes. As an investment policy, the Fund
primarily seeks income and secondarily seeks capital appreciation. The Fund
seeks capital appreciation by investing in corporate issues whose relative value
is expected to increase over time.

The Fund will only buy debt securities that are investment grade at the time of
purchase. Investment grade securities include securities issued or guaranteed by
the U.S. Government, its agencies and instrumentalities, as well as securities
rated in one of the four highest rating categories by all rating organizations
rating the securities (such as Standard & Poor's Corporation or Moody's
Investors Service, Inc.). No more than 25% of total assets may be invested in
securities rated in the fourth highest rating category. The Fund, at the
discretion of the investment advisers, may retain a security that has been
downgraded below the initial investment criteria.

In determining which securities to buy and sell, the Manager employs a top-down
fixed income investment strategy, as follows:

- - Develop an overall investment strategy, including a portfolio duration target,
  by examining the current trend in the U.S. economy.
- - Set desired portfolio maturity structure by comparing the differences between
  corporate and U.S. Government securities of similar duration to judge their
  potential for optimal return in accordance with the target duration benchmark.
- - Determine the weightings of each security type by analyzing the difference in
  yield spreads between corporate and U.S. Government securities.
- - Select specific debt securities within each security type.
- - Review and monitor portfolio composition for changes in credit, risk-return
  profile and comparisons with benchmarks.

Under normal circumstances, the Fund seeks to maintain a duration of one to
three years. Duration is a measure of price sensitivity relative to changes in
interest rates. Portfolios with longer durations are typically more sensitive to
changes in interest rates. Under adverse market conditions, the Fund may, for
temporary defensive purposes, invest up to 100% of its assets in cash or cash
equivalents, including investment grade short-term debt obligations. To the
extent that the Fund invokes this strategy, its ability to achieve its
investment objective may be affected adversely.

Risk Factors
- -------------------

INTEREST RATE RISK
The Fund is subject to the risk that the market value of the bonds it holds will
decline due to rising interest rates. When interest rates rise, the prices of
most bonds go down. When interest rates go down, bond prices generally go up.
The price of a bond is also affected by its maturity. Bonds with longer
maturities generally have greater sensitivity to changes in interest rates.

CREDIT RISK
The Fund is subject to the risk that the issuer of a bond will fail to make
timely payment of interest or principal. A decline in an issuer's credit rating
can cause its price to go down. This risk is somewhat minimized by the Fund's
policy of only investing in bonds that are considered investment grade at the
time of purchase.

PREPAYMENT RISK
The Fund's investments in mortgage-backed securities are subject to the risk
that the principal amount of the underlying mortgage may be repaid prior to the
bond's maturity date. If this occurs, no additional interest will be paid on the
investment and the Fund may have to invest at a lower rate.

ADDITIONAL RISKS
An investment in the Fund is not a deposit of a bank and is not insured or
guaranteed by the Federal Deposit Insurance Corporation or any other government
agency. The value of an investment in the Fund will fluctuate up and down. When
you sell your shares of the Fund, they could be worth less than what you paid
for them.

- --------------------------------------------------------------------------------

About the Funds                        18                             Prospectus
<PAGE>   61
AMERICAN AADVANTAGE
SHORT-TERM BOND FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

Investor Profile
- -----------------------

This Fund may be appropriate for investors who:

- - seek regular monthly income for retirement or other current expenses
- - want the relative stability of investment grade bonds
- - can benefit from a diversified portfolio of fixed income securities
- - wish to complement their equity holdings

Historical Performance
- -----------------------------------

The bar chart and table below provide an indication of risk by showing how the
Fund's performance has varied from year to year. The table shows how the Fund's
performance compares to the Lehman Brothers Intermediate Gov./Corp. and Merrill
Lynch 1-3 Year Gov./Corp. Indexes, two broad-based market indices, and the
Linked Lipper Investment Grade Debt Averages, a composite of funds with the same
investment objective as the Fund. The PlanAhead Class of the Fund began offering
its shares on August 1, 1994. However, another class of shares of the Fund not
offered in this prospectus began offering its shares on December 3, 1987. In the
chart and table below, performance results before August 1, 1994 are for the
older class. Because the other class had lower expenses, its performance was
better than the PlanAhead Class of the Fund would have realized in the same
period. Past performance is not necessarily indicative of how the Fund will
perform in the future.

                                    [GRAPH]

          TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>
90..........................................................   8.47%
91..........................................................  12.97%
92..........................................................   5.19%
93..........................................................   6.50%
94..........................................................   1.04%
95..........................................................   9.65%
96..........................................................   3.50%
97..........................................................   6.45%
98..........................................................   5.19%
99..........................................................   2.56%
</TABLE>

<TABLE>
<S>                             <C>
Highest Quarterly Return:             4.66%
  (1/1/90 through 12/31/99)     (4th Quarter 1991)
Lowest Quarterly Return:              -0.59%
  (1/1/90 through 12/31/99)     (1st Quarter 1996)
</TABLE>

<TABLE>
<CAPTION>
                               AVERAGE ANNUAL TOTAL RETURN
                              -----------------------------
                                     AS OF 12/31/99
                              -----------------------------
                              1 YEAR    5 YEARS    10 YEARS
                              ------    -------    --------
<S>                           <C>       <C>        <C>
SHORT-TERM BOND FUND          2.56%      5.44%      6.10%
Merrill Lynch 1-3 Yr. Gov./
  Corp. Index(1)              3.25%      6.59%      6.68%
Lehman Bros. Intermediate
  Gov./Corp. Index(2)         0.39%      7.09%      7.26%
Linked Lipper Investment
  Grade Debt Averages(3)      2.79%      5.74%      6.00%
</TABLE>

(1)  The Merrill Lynch 1-3 Yr. Gov./Corp. Index is a market value weighted
     performance benchmark for government and corporate fixed-rate debt
     securities with maturities between one and three years. As of March 1,
     2000, the Manager replaced the Lehman Bros. Intermediate Gov./Corp. Index
     with this Index, because it better reflects the duration of the Fund.

(2)  The Lehman Bros. Intermediate Gov./Corp. Index is a market value weighted
     performance benchmark for government and corporate fixed-rate debt
     securities with maturities between one and ten years.

(3)  The Linked Lipper Investment Grade Debt Averages includes the Lipper
     Short-Term Investment Grade Debt Average prior to 1/1/96, the Lipper
     Short-Intermediate Investment Grade Debt Average from 1/1/96 through
     7/31/96 and the Lipper Short-Term Investment Grade Debt Average since
     8/1/96.

Fees and Expenses
- ----------------------------

This table describes the fees and expenses that you may pay if you buy and hold
shares of the Short-Term Bond Fund.(1)

Annual Fund Operating Expenses
(expenses that are deducted from Fund assets)

<TABLE>
<S>                                                   <C>
Management Fees                                       0.25%
Distribution (12b-1) Fees                             0.00
Other Expenses                                        0.68(2)
                                                      ----
Total Annual Fund Operating Expenses                  0.93%
                                                      ====
Fee Waiver and/or Expense Reimbursement               0.08%
NET EXPENSES                                          0.85%
</TABLE>

(1)   The expense table and the Example below reflect the expenses of both the
      Fund and its corresponding Portfolio.

(2)   The Manager has contractually agreed to reimburse the Fund for Other
      Expenses through October 31, 2000 to the extent that Total Annual Fund
      Operating Expenses exceed 0.85%.

- --------------------------------------------------------------------------------

Prospectus                             19                        About the Funds
<PAGE>   62
AMERICAN AADVANTAGE
SHORT-TERM BOND FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

<TABLE>
<S> <C>                                              <C>
Example
- --------------------------------------------------------
This Example is intended to help you compare the cost of
investing in the Fund with the cost of investing in
other mutual funds. The Example assumes that you invest
$10,000 in the Fund for the time periods indicated and
then redeem all of your shares at the end of those
periods. The Example also assumes that your investment
has a 5% return each year and that the Fund's operating
expenses remain the same. Because the Manager's expense
reimbursement is only guaranteed through October 31,
2000, net expenses are used to calculate costs in year
one, and total fund expenses are used to calculate costs
in years two through ten. Although your actual costs may
be higher or lower, based on these assumptions your
costs would be:
    1 YEAR ......................................$87
    3 YEARS.....................................$288
    5 YEARS.....................................$507
    10 YEARS..................................$1,136
</TABLE>

Investment Adviser
- --------------------------------
AMR Investment Services, Inc.

- --------------------------------------------------------------------------------

About the Funds                        20                             Prospectus
<PAGE>   63

AMERICAN AADVANTAGE

MONEY MARKET FUND(SM)
- --------------------------------------------------------------------------------

Investment Objective
- -------------------------------

Current income, liquidity and the maintenance of a stable price of $1.00 per
share.

Principal Strategies
- ------------------------------

The Fund invests exclusively in high quality variable or fixed rate, U.S.
dollar-denominated short-term money market instruments. These securities may
include obligations of the U.S. Government, its agencies and instrumentalities;
corporate debt securities, such as commercial paper, master demand notes, loan
participation interests, medium-term notes and funding agreements; Yankeedollar
and Eurodollar bank certificates of deposit, time deposits, and bankers'
acceptances; asset-backed securities; and repurchase agreements involving the
foregoing obligations.

The Fund will only buy securities with the following credit qualities:

- - rated in the highest short-term categories by two rating organizations, such
  as "A-1" by Standard & Poor's Corporation and "P-1" by Moody's Investors
  Service, Inc., at the time of purchase,
- - rated in the highest short-term category by one rating organization if the
  securities are rated only by one rating organization, or
- - unrated securities that are determined to be of equivalent quality by the
  Manager pursuant to guidelines approved by the Board of Trustees.

The Fund invests more than 25% of its total assets in obligations issued by the
banking industry. However, for temporary defensive purposes when the Manager
believes that maintaining this concentration may be inconsistent with the best
interests of shareholders, the Fund may not maintain this concentration.

Securities purchased by the Fund generally have remaining maturities of 397 days
or less, although instruments subject to repurchase agreements and certain
variable and floating rate obligations may bear longer final maturities. The
average dollar-weighted maturity of the Fund will not exceed 90 days.

Risk Factors
- -------------------

- - The yield paid by the Fund is subject to changes in interest rates. As a
  result, there is risk that a decline in short-term interest rates would lower
  its yield and the overall return on your investment.
- - Although the Fund seeks to preserve the value of your investment at $1.00 per
  share, it is possible to lose money by investing in the Fund.
- - As with any money market fund, there is the risk that the issuers or
  guarantors of securities owned by the Fund will default on the payment of
  principal or interest or the obligation to repurchase securities from the
  Fund.

Your investment in the Fund is not insured or guaranteed by the U.S. Government
or any financial or government institution.

Investor Profile
- -----------------------

This Fund may be suitable for investors who:

- - seek the preservation of capital and to avoid fluctuations in principal
- - desire regular, monthly income from a highly liquid investment
- - require a short-term vehicle for cash when making long-term investment
  decisions
- - seek a rate of return that is potentially higher than certificates of deposit
  or savings accounts

Historical Performance
- -----------------------------------

The bar chart and table below provide an indication of risk by showing how the
Fund's performance has varied from year to year. The PlanAhead Class of the Fund
began offering its shares on August 1, 1994. However, another class of shares of
the Fund not offered in this prospectus began offering its shares on September
1, 1987. In the chart and table below, performance results before August 1, 1994
are for the older class. Because the other class had lower expenses, its
performance was better than the PlanAhead Class of the Fund would have realized
in the same period. Past performance is not necessarily indicative of how the
Fund will perform in the

- --------------------------------------------------------------------------------

Prospectus                             21                        About the Funds
<PAGE>   64
AMERICAN AADVANTAGE
MONEY MARKET FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

future. You may call 1-800-388-3344 to obtain the Fund's current seven-day
yield.

                                    [GRAPH]

          TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>
90..........................................................   8.40%
91..........................................................   6.77%
92..........................................................   4.02%
93..........................................................   3.28%
94..........................................................   4.02%
95..........................................................   5.70%
96..........................................................   5.15%
97..........................................................   5.32%
98..........................................................   5.24%
99..........................................................   4.87%
</TABLE>

<TABLE>
<S>                               <C>
Highest Quarterly Return:                  2.06%
 (1/1/90 through 12/31/99)           (2nd Quarter 1990)
Lowest Quarterly Return:                   0.80%
 (1/1/90 through 12/31/99)        (2nd & 4th Quarter 1993,
                                     1st Quarter 1994)
</TABLE>

<TABLE>
<CAPTION>
      AVERAGE ANNUAL
       TOTAL RETURN
- ---------------------------
      AS OF 12/31/99
- ---------------------------
1 YEAR   5 YEARS   10 YEARS
- ------   -------   --------
<S>      <C>       <C>
4.87%     5.26%     5.27%
</TABLE>

Fees and Expenses
- ----------------------------

This table describes the fees and expenses that you may pay if you buy and hold
shares of the Money Market Fund.(1)

Annual Fund Operating Expenses
(expenses that are deducted from Fund assets)

<TABLE>
<S>                                                     <C>
Management Fees                                         0.10%
Distribution (12b-1) Fees                               0.00
Other Expenses                                          0.43
                                                        ----
TOTAL ANNUAL FUND OPERATING EXPENSES                    0.53%
                                                        ====
</TABLE>

(1)   The expense table and the Example below reflect the expenses of both the
      Fund and its corresponding Portfolio.

Example
- -------------

This Example is intended to help you compare the cost of investing in the Fund
with the cost of investing in other mutual funds. The Example assumes that you
invest $10,000 in the Fund for the time periods indicated and then redeem all of
your shares at the end of those periods. The Example also assumes that your
investment has a 5% return each year and that the Fund's operating expenses
remain the same. Although your actual costs may be higher or lower, based on
these assumptions your costs would be:

<TABLE>
<S>                                        <C>
1 YEAR..................................    $54
3 YEARS.................................   $170
5 YEARS.................................   $296
10 YEARS................................   $665
</TABLE>

Investment Adviser
- -----------------------------

AMR Investment Services, Inc.

- --------------------------------------------------------------------------------

About the Funds                        22                             Prospectus
<PAGE>   65

AMERICAN AADVANTAGE
U.S. GOVERNMENT MONEY MARKET FUND(SM)
- --------------------------------------------------------------------------------

Investment Objective
- -------------------------------

Current income, liquidity and the maintenance of a stable price of $1.00 per
share.

Principal Strategies
- ------------------------------

The Fund invests exclusively in obligations issued or guaranteed by the U.S.
Government, its agencies or instrumentalities and repurchase agreements that are
collateralized by such obligations. Some of these securities are not backed by
the full faith and credit of the U.S. Government. U.S. Government securities
include direct obligations of the U.S. Treasury (such as Treasury bills,
Treasury notes and Treasury bonds).

Securities purchased by the Fund generally have remaining maturities of 397 days
or less, although instruments subject to repurchase agreements and certain
variable and floating rate obligations may bear longer final maturities. The
average dollar-weighted maturity of the Fund will not exceed 90 days.

Risk Factors
- -------------------

- - The yield paid by the Fund is subject to changes in interest rates. As a
  result, there is risk that a decline in short-term interest rates would lower
  its yield and the overall return on your investment.
- - Although the Fund seeks to preserve the value of your investment at $1.00 per
  share, it is possible to lose money by investing in the Fund.

Your investment in the Fund is not insured or guaranteed by the U.S. Government
or any financial or government institution.

Investor Profile
- -----------------------

This Fund may be suitable for investors who:

- - seek the preservation of capital and to avoid fluctuations in principal
- - desire regular, monthly income from a highly liquid investment
- - require a short-term vehicle for cash when making long-term investment
  decisions
- - seek a rate of return that is potentially higher than certificates of deposit
  or savings accounts

Historical Performance
- -----------------------------------

The bar chart and table below provide an indication of risk by showing how the
Fund's performance has varied from year to year. The PlanAhead Class of the Fund
began offering its shares on August 1, 1994. However, another class of shares of
the Fund not offered in this prospectus began offering its shares on March 2,
1992. In the chart and table below, performance results before August 1, 1994
are for the older class. Because the other class had lower expenses, its
performance was better than the PlanAhead Class of the Fund would have realized
in the same period. Past performance is not necessarily indicative of how the
Fund will perform in the future. You may call 1-800-388-3344 to obtain the
Fund's current seven-day yield.

                                    [GRAPH]

TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>
93..........................................................    3.05%
94..........................................................    3.89%
95..........................................................    5.27%
96..........................................................    4.88%
97..........................................................    5.13%
98..........................................................    5.04%
99..........................................................    4.66%
</TABLE>

<TABLE>
<S>                               <C>
Highest Quarterly Return:               1.32%
  (1/1/93 through 12/31/99)       (2nd Quarter 1995)
Lowest Quarterly Return:                0.74%
  (1/1/93 through 12/31/99)       (4th Quarter 1993)
</TABLE>

<TABLE>
<CAPTION>
 AVERAGE ANNUAL TOTAL RETURN
- -----------------------------
       AS OF 12/31/99
- -----------------------------
                     SINCE
                   INCEPTION
1 YEAR   5 YEARS    (3/2/92)
- ------   -------   ----------
<S>      <C>       <C>
4.66%     4.99%      4.45%
</TABLE>

- --------------------------------------------------------------------------------

Prospectus                             23                        About the Funds
<PAGE>   66
AMERICAN AADVANTAGE
U.S. GOVERNMENT MONEY MARKET FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

Fees and Expenses
- ----------------------------

This table describes the fees and expenses that you may pay if you buy and hold
shares of the U.S. Government Money Market Fund.(1)

Annual Fund Operating Expenses
(expenses that are deducted from Fund assets)

<TABLE>
<S>                                                   <C>
Management Fees                                       0.10%
Distribution (12b-1) Fees                             0.00
Other Expenses                                        0.46
                                                      ----
TOTAL ANNUAL FUND OPERATING EXPENSES                  0.56%
                                                      ====
</TABLE>

(1)  The expense table and the Example below reflect the expenses of both the
     Fund and its corresponding Portfolio.

Example
- -------------

This Example is intended to help you compare the cost of investing in the Fund
with the cost of investing in other mutual funds. The Example assumes that you
invest $10,000 in the Fund for the time periods indicated and then redeem all of
your shares at the end of those periods. The Example also assumes that your
investment has a 5% return each year and that the Fund's operating expenses
remain the same. Although your actual costs may be higher or lower, based on
these assumptions your costs would be:

<TABLE>
<S>                                          <C>
1 YEAR .....................................  $57
3 YEARS..................................... $179
5 YEARS..................................... $313
10 YEARS.................................... $701
</TABLE>

Investment Adviser
- -----------------------------

AMR Investment Services, Inc.

- --------------------------------------------------------------------------------

About the Funds                        24                             Prospectus
<PAGE>   67

AMERICAN AADVANTAGE
MUNICIPAL MONEY MARKET FUND(SM)
- --------------------------------------------------------------------------------

Investment Objective
- -------------------------------

Current income, liquidity and the maintenance of a stable price of $1.00 per
share.

Principal Strategies
- ------------------------------

Under normal market conditions, the Fund invests at least 80% of its net assets
in securities whose interest income is exempt from federal income tax. These
securities may be issued by or on behalf of the governments of U.S. states,
counties, cities, towns, territories, or public authorities. All securities
purchased by the Fund will be guaranteed by the U.S. Government, its agencies,
or instrumentalities; secured by irrevocable letters of credit issued by
qualified banks; or guaranteed by one or more municipal bond insurance policies.

The Fund will only buy securities with the following credit qualities:

- - rated in the highest short-term categories by two rating organizations, such
  as "A-1" by Standard & Poor's Corporation and "P-1" by Moody's Investors
  Service, Inc., at the time of purchase,
- - rated in the highest short-term category by one rating organization if the
  securities are rated only by one rating organization, or
- - unrated securities that are determined to be of equivalent quality by the
  Manager pursuant to guidelines approved by the Board of Trustees.

Securities purchased by the Fund generally have remaining maturities of 397 days
or less, although instruments subject to repurchase agreements and certain
variable and floating rate obligations may bear longer final maturities. The
average dollar-weighted maturity of the Fund will not exceed 90 days.

Risk Factors
- -------------------

- - The yield paid by the Fund is subject to changes in interest rates. As a
  result, there is risk that a decline in short-term interest rates would lower
  its yield and the overall return on your investment.
- - Although the Fund seeks to preserve the value of your investment at $1.00 per
  share, it is possible to lose money by investing in the Fund.
- - As with any money market fund, there is the risk that the issuers or
  guarantors of securities owned by the Fund will default on the payment of
  principal or interest or the obligation to repurchase securities from the
  Fund.

Your investment in the Fund is not insured or guaranteed by the U.S. Government
or any financial or government institution.

Investor Profile
- -----------------------

This Fund may be suitable for investors who:

- - seek the preservation of capital and to avoid fluctuations in principal
- - desire regular, monthly income that is generally exempt from Federal income
  tax
- - require a short-term vehicle for cash when making long-term investment
  decisions
- - seek an after-tax rate of return that is potentially higher than certificates
  of deposit or savings accounts

Historical Performance
- -----------------------------------

The bar chart and table below provide an indication of risk by showing how the
Fund's performance has varied from year to year. The PlanAhead Class of the Fund
began offering its shares on August 1, 1994. However, another class of shares of
the Fund not offered in this prospectus began offering its shares on November
10, 1993. In the chart and table below, performance results before August 1,
1994 are for the older class. Because the other class had lower expenses, its
performance was better than the PlanAhead Class of the Fund would have realized
in the same period. Past performance is not necessarily indicative of how the
Fund will perform in the future. You may call 1-800-388-3344 to obtain the
Fund's current seven-day yield.

- --------------------------------------------------------------------------------

Prospectus                             25                        About the Funds
<PAGE>   68
AMERICAN AADVANTAGE
MUNICIPAL MONEY MARKET FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

                                    [GRAPH]

          TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>
94..........................................................    2.52%
95..........................................................    3.47%
96..........................................................    3.18%
97..........................................................    3.26%
98..........................................................    3.08%
99..........................................................    2.74%
</TABLE>

<TABLE>
<S>                             <C>
Highest Quarterly Return:             0.91%
  (1/1/94 through 12/31/99)     (2nd Quarter 1995)
Lowest Quarterly Return:              0.52%
  (1/1/94 through 12/31/99)     (1st Quarter 1994)
</TABLE>

<TABLE>
<CAPTION>
 AVERAGE ANNUAL TOTAL RETURN
- -----------------------------
       AS OF 12/31/99
- -----------------------------
                     SINCE
                   INCEPTION
1 YEAR   5 YEARS   (11/10/93)
- ------   -------   ----------
<S>      <C>       <C>
2.74%     3.15%      3.02%
</TABLE>

Fees and Expenses
- ----------------------------

This table describes the fees and expenses that you may pay if you buy and hold
shares of the Municipal Money Market Fund.(1)

Annual Fund Operating Expenses
(expenses that are deducted from Fund assets)

<TABLE>
<S>                                                    <C>
Management Fees                                        0.10%
Distribution (12b-1) Fees                              0.00
Other Expenses                                         0.55
                                                       ----
TOTAL ANNUAL FUND OPERATING EXPENSES                   0.65%
                                                       ====
</TABLE>

(1)   The expense table and the Example below reflect the expenses of both the
      Fund and its corresponding Portfolio.

<TABLE>
<S> <C>                                          <C>
Example
- ----------------------------------------------------
This Example is intended to help you compare the
cost of investing in the Fund with the cost of
investing in other mutual funds. The Example assumes
that you invest $10,000 in the Fund for the time
periods indicated and then redeem all of your shares
at the end of those periods. The Example also
assumes that your investment has a 5% return each
year and that the Fund's operating expenses remain
the same. Although your actual costs may be higher
or lower, based on these assumptions your costs
would be:
1 YEAR ..........................................$66
3 YEARS.........................................$208
5 YEARS.........................................$362
10 YEARS........................................$810
</TABLE>

Investment Adviser
- -----------------------------

AMR Investment Services, Inc.

- --------------------------------------------------------------------------------

About the Funds                        26                             Prospectus
<PAGE>   69

The Manager
- ---------------------

The Trust has retained AMR Investment Services, Inc. to serve as its Manager.
The Manager, located at 4333 Amon Carter Boulevard, Fort Worth, Texas 76155, is
a wholly owned subsidiary of AMR Corporation, the parent company of American
Airlines, Inc. The Manager was organized in 1986 to provide investment
management, advisory, administrative and asset management consulting services.
As of December 31, 1999, the Manager had approximately $21.7 billion of assets
under management, including approximately $8.4 billion under active management
and $13.3 billion as named fiduciary or financial adviser. Of the total,
approximately $15.3 billion of assets are related to AMR Corporation.

The Manager provides or oversees the provision of all administrative, investment
advisory and portfolio management services to the Funds. The Manager

- - develops the investment programs for each Fund,
- - selects and changes investment advisers (subject to requisite approvals),
- - allocates assets among investment advisers,
- - monitors the investment advisers' investment programs and results,
- - coordinates the investment activities of the investment advisers to ensure
  compliance with regulatory restrictions,
- - oversees each Fund's securities lending activities and actions taken by the
  securities lending agent, and
- - with the exception of the International Equity and S&P 500 Index Funds,
  invests the portion of Fund assets which the investment advisers determine
  should be allocated to high quality short-term debt obligations.

As compensation for providing management services, the Manager receives an
annualized advisory fee that is calculated and accrued daily, equal to the sum
of:

- - 0.25% of the net assets of the Manager's portion of the Intermediate Bond
  Fund,
- - 0.25% of the net assets of the Short-Term Bond Fund, plus
- - 0.10% of the net assets of all other Funds.

In addition, the Balanced, Large Cap Value, Small Cap Value, International
Equity and Intermediate Bond Funds pay the Manager the amounts due to their
respective investment advisers. The Manager then remits these amounts to the
investment advisers.

The Manager also may receive up to 25% of the net annual interest income or up
to 25% of loan fees in regards to securities lending activities. Currently, the
Manager receives 10% of the net annual interest income from the investment of
cash collateral or 10% of the loan fees posted by borrowers. The Securities and
Exchange Commission ("SEC") has granted exemptive relief that permits the Funds
to invest cash collateral received from securities lending transactions in
shares of one or more private or registered investment companies managed by the
Manager.

The management fees paid by the Funds for the fiscal year ended October 31,
1999, net of reimbursements and shown as a percentage of average net assets,
were as follows:

<TABLE>
<CAPTION>
              FUND                MANAGEMENT FEES
              ----                ---------------
<S>                               <C>
Balanced........................       0.30%
Large Cap Value.................       0.30%
Small Cap Value.................       0.67%
Intermediate Bond...............       0.25%
International Equity............       0.36%
S&P 500 Index...................       0.08%
Short-Term Bond.................       0.25%
Money Market....................       0.10%
U.S. Government Money Market....       0.10%
Municipal Money Market..........       0.10%
</TABLE>

William F. Quinn and Nancy A. Eckl have primary responsibility for the
day-to-day operations of the Balanced, Large Cap Value, Small Cap Value,
International Equity and Intermediate Bond Funds, except as indicated otherwise
below. These responsibilities include oversight of the investment advisers,
regular review of each investment adviser's performance and asset allocations
among multiple investment advisers. Mr. Quinn has served as President of the
Manager since its inception in 1986. Ms. Eckl has served as Vice President-Trust
Investments of the Manager since May 1995. Prior to her current position, Ms.
Eckl held the position of Vice President-Finance and Compliance of the Manager
from December 1990 through April 1995.

Michael W. Fields oversees the team responsible for the portfolio management of
the Short-Term Bond Fund. Mr. Fields has been with the Manager since it was
founded in 1986 and serves as Vice President-Fixed Income Investments.

Equity 500 Index Portfolio Administrator
- ------------------------------------------------------------

State Street serves as the adviser, administrator, custodian and transfer agent
to the Equity 500 Index Portfolio. As compensation for its services as adviser,
administrator, custodian and transfer agent (and for assuming ordinary operating
expenses of the Portfolio, including ordinary legal and audit expenses), State
Street receives an advisory fee at an annual rate of 0.045% of the average daily
net assets of the Portfolio.

The Investment Advisers
- ----------------------------------------

Set forth below is a brief description of the investment advisers for each Fund.
The Manager is the sole investment adviser of the Money Market Funds

- --------------------------------------------------------------------------------

Prospectus                             27                        About the Funds
<PAGE>   70

and the Short-Term Bond Fund. Except for these Funds and the S&P 500 Index Fund,
each Fund's assets are allocated among the investment advisers by the Manager.
The assets of the Intermediate Bond Fund are allocated by the Manager between
the Manager and another investment adviser. Each investment adviser has
discretion to purchase and sell securities for its segment of a Fund's assets in
accordance with the Fund's objectives, policies, restrictions and more specific
strategies provided by the Manager. Pursuant to an exemptive order issued by the
SEC, the Manager is permitted to enter into new or modified investment advisory
agreements with existing or new investment advisers without approval of a Fund's
shareholders, but subject to approval of the Trust's Board of Trustees ("Board")
and the AMR Investment Services Trust Board ("AMR Trust Board"). The Prospectus
will be supplemented if additional investment advisers are retained or the
contract with any existing investment adviser is terminated.

BARROW, HANLEY, MEWHINNEY & STRAUSS, INC., ("BARROW"), 3232 McKinney Avenue,
15th Floor, Dallas, Texas 75204, is a professional investment counseling firm
which has been providing investment advisory services since 1979. The firm is
wholly owned by United Asset Management Corporation, a Delaware corporation. As
of December 31, 1999, Barrow had discretionary investment management authority
with respect to approximately $29.1 billion of assets, including approximately
$1.3 billion of assets of AMR and its subsidiaries and affiliated entities.
Barrow serves as an investment adviser to the Balanced, Large Cap Value,
Intermediate Bond and Short-Term Bond Funds, although the Manager does not
presently intend to allocate any of the assets in the Short-Term Bond Fund to
Barrow.

BRANDYWINE ASSET MANAGEMENT, INC. ("BRANDYWINE"), 201 North Walnut Street,
Wilmington, Delaware 19801, is a professional investment counseling firm founded
in 1986. Brandywine is a wholly owned subsidiary of Legg Mason, Inc. As of
December 31, 1999, Brandywine had assets under management totaling approximately
$6.6 billion, including approximately $1.1 billion of assets of AMR and its
subsidiaries and affiliated entities. Brandywine serves as an investment adviser
to the Balanced, Large Cap Value and Small Cap Value Funds.

HOTCHKIS AND WILEY, 725 South Figueroa Street, Suite 4000, Los Angeles,
California 90017, is a professional investment management firm which was founded
in 1980. Hotchkis and Wiley is a division of Merrill Lynch Asset Management,
L.P., a wholly owned indirect subsidiary of Merrill Lynch & Co., Inc. Assets
under management as of December 31, 1999 were approximately $12.6 billion, which
included approximately $1.9 billion of assets of AMR and its subsidiaries and
affiliated entities. Hotchkis and Wiley serves as an investment adviser to the
Balanced, Large Cap Value, Small Cap Value and International Equity Funds.

INDEPENDENCE INVESTMENT ASSOCIATES, INC. ("IIA"), 53 State Street, Boston,
Massachusetts 02109, is a professional investment counseling firm which was
founded in 1982. The firm is a wholly owned subsidiary of John Hancock Financial
Services. Assets under management as of December 31, 1999, including funds
managed for its parent company, were approximately $32.5 billion, which included
approximately $1.2 billion of assets of AMR and its subsidiaries and affiliated
entities. IIA serves as an investment adviser to the Balanced, Large Cap Value
and International Equity Funds.

LAZARD ASSET MANAGEMENT ("LAZARD"), 30 Rockefeller Plaza, New York, New York
10112, is a division of Lazard Freres & Co. LLC, a registered investment adviser
and a member of the New York, American and Chicago Stock Exchanges, providing
its clients with a wide variety of investment banking, brokerage and related
services. Lazard provides investment management services to client discretionary
accounts with assets totaling approximately $74.5 billion as of December 31,
1999, including approximately $400 million of assets of AMR and its subsidiaries
and affiliated entities. Lazard serves as an investment adviser to the
International Equity Fund.

STATE STREET BANK AND TRUST COMPANY ("STATE STREET"), Two International Place,
Boston, Massachusetts 02110, is a Massachusetts banking corporation. State
Street serves as investment adviser and administrator to the Equity 500 Index
Portfolio. As of December 31, 1999, State Street Global Advisors, the division
responsible for managing the Portfolio, had assets under management of $672.4
billion.

TEMPLETON INVESTMENT COUNSEL, INC. ("TEMPLETON"), 500 East Broward Blvd., Suite
2100, Fort Lauderdale, Florida 33394-3091, is a professional investment
counseling firm which has been providing investment services since 1979.
Templeton is indirectly owned by Franklin Resources, Inc. As of December 31,
1999, Templeton had discretionary investment management authority with respect
to approximately $24.9 billion of assets, including approximately $842 million
of assets of AMR and its subsidiaries and affiliated entities. Templeton serves
as an investment adviser to the International Equity Fund.

All other assets of American Airlines, Inc. and its affiliates under management
by each respective investment adviser (except assets managed by Barrow under the
HALO Bond Program) are considered when calculating the fees for each investment
adviser other than State Street. Including these assets lowers the investment
advisory fees for each applicable Fund.

- --------------------------------------------------------------------------------

About the Funds                        28                             Prospectus
<PAGE>   71

Valuation of Shares
- -------------------------------

The price of each Fund's shares is based on its net asset value ("NAV") per
share. Each Fund's NAV is computed by adding total assets, subtracting all of
the Fund's liabilities, and dividing the result by the total number of shares
outstanding. Equity securities are valued based on market value. Debt securities
(other than short-term securities) usually are valued on the basis of prices
provided by a pricing service. In some cases, the price of debt securities is
determined using quotes obtained from brokers. Securities are valued at fair
value, as determined in good faith and pursuant to procedures approved by the
Board and the AMR Trust Board, under certain limited circumstances. For example,
fair valuation would be used if market quotations are not readily available or a
material event occurs after the close of the Exchange which may affect a
security's value. Securities held by the Money Market Funds are valued in
accordance with the amortized cost method, which is designed to enable those
Funds to maintain a stable NAV of $1.00 per share.

The NAV of PlanAhead Class shares will be determined based on a pro rata
allocation of the Portfolio's investment income, expenses and total capital
gains and losses. Each Fund's NAV per share is determined as of the close of the
New York Stock Exchange ("Exchange"), generally 4:00 p.m. Eastern Time, on each
day on which it is open for business. In addition to the days the Exchange is
closed, the Money Market Funds are also not open and no NAV is calculated on
Columbus Day and Veterans Day. The NAV per share of the International Equity
Fund may change on days when shareholders will not be able to purchase or redeem
the Fund's shares.

ABOUT YOUR INVESTMENT
- ------------------------------------------------------------

Purchase and Redemption of Shares
- ----------------------------------------------------------
Eligibility
- ---------------

PlanAhead Class shares are offered to all investors, including investors using
intermediary organizations such as discount brokers or plan sponsors and
retirement accounts.

Purchase Policies
- --------------------------

No sales charges are assessed on the purchase or sale of Fund shares. Shares of
the Funds are offered and purchase orders accepted until the deadlines listed
below on each day on which the Exchange is open for trading. In addition, shares
of the Money Market Funds are not offered and orders are not accepted on
Columbus Day and Veterans Day:

<TABLE>
<CAPTION>
                                   PURCHASE BY
             FUND                (EASTERN TIME):*
             ----                ----------------
<S>                              <C>
Municipal Money Market              11:45 a.m.
All other Funds                      4:00 p.m.
</TABLE>

*   or the close of the Exchange (whichever comes first)

If a purchase order is received in good order prior to the applicable Fund's
deadline, the purchase price will be the NAV per share next determined on that
day. If a purchase order is received in good order after the applicable
deadline, the purchase price will be the NAV of the following day that the Fund
is open for business. Checks to purchase shares are accepted subject to
collection at full face value in U.S. funds and must be drawn in U.S. dollars on
a U.S. bank. The Funds will not accept "starter" checks, credit card checks or
third party checks.

Opening an Account
- -------------------------------

A completed, signed application is required to open an account. You may request
an application form by:

- - calling (800) 388-3344, or
- - visiting the Funds' web site at www.aafunds.com and downloading an account
  application.

Complete the application, sign it and

                                    Mail to:
                           American AAdvantage Funds
                                P.O. Box 219643
                           Kansas City, MO 64121-9643

Redemption Policies
- ------------------------------

Shares of any Fund may be redeemed by telephone, by pre-authorized automatic
redemption or mail on any day that Fund is open for business. The redemption
price will be the NAV next determined after a redemption order is received in
good order. For assistance with completing a redemption request, please call
(800) 338-3344. Except for the Money Market Funds, wire proceeds from redemption
orders received by 4:00 p.m. Eastern Time generally are transmitted to
shareholders on the next day that the Funds are open for business. Proceeds from
redemptions requested for the Money Market Funds by the following deadlines will
generally be wired to shareholders on the same day.

- --------------------------------------------------------------------------------
Prospectus                             29                  About Your Investment
<PAGE>   72

<TABLE>
<CAPTION>
                               SAME DAY WIRE
FUND                    REDEMPTION ORDER DEADLINE:*
- ----                    ---------------------------
<S>                     <C>
Money Market and U.S.
  Government Money
  Market                 2:00 p.m. Eastern Time
Municipal Money
  Market                 11:45 a.m. Eastern Time
</TABLE>

*  or the close of the Exchange (whichever comes first)

In any event, proceeds from a redemption order for any Fund will be transmitted
to a shareholder by no later than seven days after the receipt of a redemption
request in good order. Delivery of proceeds from shares purchased by check or
pre-authorized automatic investment may be delayed until the funds have cleared,
which may take up to 15 days.

The Funds reserve the right to suspend redemptions or postpone the date of
payment (i) when the Exchange is closed (other than for customary weekend and
holiday closings); (ii) when trading on the Exchange is restricted; (iii) when
the SEC determines that an emergency exists so that disposal of a Fund's
investments or determination of its NAV is not reasonably practicable; or (iv)
by order of the SEC for protection of the Funds' shareholders.

Although the Funds intend to redeem shares in cash, each Fund reserves the right
to pay the redemption price in whole or in part by a distribution of readily
marketable securities held by the applicable Fund's corresponding Portfolio.
Unpaid dividends credited to an account up to the date of redemption of all
shares of a Money Market Fund generally will be paid at the time of redemption.

<TABLE>
<CAPTION>
HOW TO PURCHASE SHARES
                To Make an Initial Purchase                                      To Add to an Existing Account
<S>                                                               <C>
By Check
- - Make check payable to the American AAdvantage Funds             Include the shareholder's account number, Fund name, and
- - Include the Fund name, Fund number and "PlanAhead Class"        Fund number on the check. Mail check ($50 minimum) to:
  on the check                                                    American AAdvantage Funds
- - Mail check ($2,500 minimum or $2,000 for IRAs) to:              P.O. Box 219643
  American AAdvantage Funds                                       Kansas City, MO 64121-9643
  P.O. Box 219643
  Kansas City, MO 64121-9643
By Wire
If your account has been established, you may call (800)          Call (800) 388-3344 to purchase shares by wire. Send a bank
388-3344 to purchase shares by wire. Send a bank wire             wire ($500 minimum) to State Street Bank & Trust Co. with
($2,500 minimum or $2,000 for IRAs) to State Street Bank &        these instructions:
Trust Co. with these instructions:
- - ABA# 0110-0002-8; AC-9905-342-3                                 - ABA# 0110-0002-8; AC-9905-342-3
- - Attn: American AAdvantage Funds-PlanAhead Class                 - Attn: American AAdvantage Funds-PlanAhead Class
- - the Fund name and Fund number                                   - the Fund name and Fund number
- - shareholder's account number and registration                   - shareholder's account number and registration
By Pre-Authorized Automatic Investment
- - The minimum account size of $2,500 ($2,000 for IRAs) must       - Funds will be transferred automatically from your bank
  be met before establishing an automatic investment plan.          account via Automated Clearing House ("ACH") on or about
- - Fill in required information on the account application,          the 5th day of each month or quarter, depending upon
  including amount of automatic investment ($50 minimum)            which periods you specify.
- - Attach a voided check to the account application
By Exchange
- - Send a written request to the address above or call (800)       - You may purchase shares of a Fund by exchanging shares
  388-3344                                                          from the PlanAhead Class of another American AAdvantage
- - A $2,500 minimum is required to establish a new account           Fund if you have owned shares of the other American
  in the PlanAhead Class of another American AAdvantage             AAdvantage Fund for at least 15 days.
  Fund by making an exchange.                                     - The minimum amount for each exchange is $50.
</TABLE>

- --------------------------------------------------------------------------------
About Your Investment                  30                             Prospectus
<PAGE>   73

<TABLE>
<CAPTION>
HOW TO REDEEM SHARES
Method                                                            Additional Information
<S>                                                               <C>
By Telephone
Call (800) 388-3344 to request a redemption.                      - Telephone redemption orders are limited to $50,000 within
                                                                    any 30 day period.
                                                                  - Proceeds will generally be mailed only to the account
                                                                    address of record or transmitted by wire to a commercial
                                                                    bank designated on the account application form.
By Mail
Write a letter of instruction including:                          - Proceeds will only be mailed to the account address of
- - the Fund name and Fund number                                     record or transmitted by wire to a commercial bank account
- - shareholder account number                                        designated on the account application form.
- - shares or dollar amount to be redeemed                            A signature guarantee is required for redemption orders:
- - authorized signature(s) of all persons required to sign         - in amounts of $50,000 or more
  for the account                                                 - with a request to send the proceeds to an address or
                                                                    commercial bank account other than the address or
Mail to:                                                            commercial bank account designated on the account
                                                                    application, or
American AAdvantage Funds                                         - for an account whose address has changed within the last
P.O. Box 219643                                                     30 days.
Kansas City, MO 64121-9643
By Check
(Money Market Funds' shareholders only)                           - Minimum check amount is $100
Choose the check writing feature on the account application       - A $2 service fee per check is charged for check copies
By Pre-Authorized Automatic Redemption
- - Fill in required information on the account application,        - Proceeds will be transferred automatically from your Fund
  including amount ($100 minimum)                                   account to your bank account via ACH on or about the 15th
                                                                    day of each month.
By Exchange
- - Send a written request to the address above or call (800)       - You may sell shares of a Fund in exchange for shares of
  388-3344 to exchange shares through the Automated Voice           the PlanAhead Class of another American AAdvantage Fund if
  Response System.                                                  you have owned shares of the Fund for at least 15 days.
                                                                  - The minimum amount for each exchange is $50
</TABLE>

General Policies
- ------------------------

If a shareholder's account balance in any Fund falls below $2,500 ($2,000 for
IRAs), the shareholder may be asked to increase the balance. If the account
balance remains below $2,500 ($2,000 for IRAs) after 45 days, the Funds reserve
the right to close the account and send the proceeds to the shareholder. The
Manager reserves the right to charge an annual account fee of $12 (to offset the
costs of servicing accounts with low balances) if an account balance falls below
certain asset levels.

The following policies apply to instructions you may provide to the Funds by
telephone:

- - The Funds, their officers, trustees, directors, employees, or agents are not
  responsible for the authenticity of instructions provided by telephone, nor
  for any loss, liability, cost or expense incurred for acting on them.
- - The Funds employ procedures reasonably designed to confirm that instructions
  communicated by telephone are genuine.
- - Due to the volume of calls or other unusual circumstances, telephone
  redemptions may be difficult to implement during certain time periods.

The Funds reserve the right to:

- - reject any order for the purchase of shares and to limit or suspend, without
  prior notice, the offering of shares,
- - modify or terminate the exchange privilege at any time,
- - terminate the exchange privilege of any shareholder who makes more than one
  exchange in and out of a Fund (other than the Money Market Funds) during any
  three month period, and
- - seek reimbursement from you for any related loss incurred if your payment for
  the purchase of Fund shares by check does not clear your bank.

Third parties, such as banks, broker-dealers and 401(k) plan providers who offer
Fund shares, may

- --------------------------------------------------------------------------------
Prospectus                             31                  About Your Investment
<PAGE>   74

charge transaction fees and may set different minimum investments or limitations
on buying or selling shares.

Distributions and Taxes
- ---------------------------------------

The Funds distribute most or all of their net earnings in the form of dividends
from net investment income and distributions of realized net capital gains and
gains from certain foreign currency transactions. Unless the account application
instructs otherwise, distributions will be reinvested in additional Fund shares.
Monthly distributions are paid to shareholders on the first business day of the
following month. Distributions are paid as follows:

<TABLE>
<CAPTION>
                                                  OTHER
                                              DISTRIBUTIONS
FUND                   DIVIDENDS PAID             PAID
- ----                   --------------         -------------
<S>                    <C>                    <C>
Balanced               Annually                  Annually
Large Cap Value        Annually                  Annually
Small Cap Value        Annually                  Annually
International Equity   Annually                  Annually
S&P 500 Index          April, July, October      Annually
                         and December
Intermediate Bond      Monthly                   Annually
Short-Term Bond        Monthly                   Annually
Money Market           Monthly                   Monthly
U.S. Government Money  Monthly                   Monthly
  Market
Municipal Money        Monthly                   Monthly
  Market
</TABLE>

Usually, any dividends (except those paid by the Municipal Money Market Fund)
and distributions of net realized gains are taxable events. Shareholders may
realize a taxable gain or loss when selling or exchanging shares (other than
shares of the Money Market Funds). That gain or loss may be treated as a
short-term or long-term capital gain, depending on how long the sold or
exchanged shares were held. The following table outlines the typical tax
liabilities for transactions in taxable accounts:

<TABLE>
<CAPTION>
TYPE OF TRANSACTION                    TAX STATUS
- -------------------                    ----------
<S>                                    <C>
Dividends from net investment          Ordinary income rate
  income*
Distributions of realized net short-   Ordinary income rate
  term capital gains*
Distributions of gains from certain    Ordinary income rate
  foreign currency transactions*
Distributions of realized net          Long-term capital
  long-term capital gains*               gains rate
</TABLE>

<TABLE>
<CAPTION>
TYPE OF TRANSACTION                    TAX STATUS
- -------------------                    ----------
<S>                                    <C>
Sales or exchanges of shares owned     Long-term capital
  for more than one year                 gains or losses
Sales or exchanges of shares owned     Net gains are treated
  for less than one year                 as ordinary income;
                                       net losses are subject
                                         to special rules
</TABLE>

*   whether reinvested or taken in cash

Some foreign countries may impose taxes on dividends paid to and gains realized
by the International Equity Fund. The Fund may treat these taxes as a deduction
or, under certain conditions, "flow the tax through" to shareholders. In the
latter event, shareholders may either deduct the taxes or use them to calculate
a credit against their federal income tax.

A portion of the income dividends paid by the Balanced Fund, the Large Cap Value
Fund, the Small Cap Value Fund and the S&P 500 Index Fund is eligible for the
dividends-received deduction allowed to corporations. The eligible portion may
not exceed the Fund's aggregate dividends received from U.S. corporations.
However, dividends received by a corporate shareholder and deducted by it
pursuant to the dividends-received deduction may be subject indirectly to the
federal alternative minimum tax ("AMT"). The International Equity Fund's
dividends most likely will not qualify for the dividends-received deduction
because none of the dividends received by that Fund are expected to be paid by
U.S. corporations.

The Municipal Money Market Fund designates most of its distributions as
"exempt-interest dividends," which may be excluded from gross income. If the
Fund earns taxable income from any of its investments, that income will be
distributed as a taxable dividend. If the Fund invests in private activity
obligations, shareholders will be required to treat a portion of the
exempt-interest dividends they receive as a "tax preference item" in determining
their liability for AMT. Some states exempt from income tax the interest on
their own obligations and on obligations of governmental agencies and
municipalities in the state; accordingly, each year shareholders will receive
tax information on the Fund's exempt-interest income by state.

This is only a summary of some of the important income tax considerations that
may affect Fund shareholders. Shareholders should consult their tax adviser
regarding specific questions as to the effect of federal, state or local income
taxes on an investment in the Funds.

- --------------------------------------------------------------------------------
About Your Investment                  32                             Prospectus
<PAGE>   75

ADDITIONAL INFORMATION
- ------------------------------------------------------------

Distribution of Trust Shares
- ----------------------------------------------

The Trust does not incur any direct distribution expenses related to PlanAhead
Class shares. However, the Trust has adopted a Distribution Plan in accordance
with Rule 12b-1 under the Investment Company Act of 1940 ("1940 Act") which
authorizes the use of any fees received by the Manager in accordance with the
Administrative Services and Management Agreements, and any fees received by the
investment advisers pursuant to their Advisory Agreements with the Manager, to
be used for the sale and distribution of Fund shares. In the event the Trust
begins to incur distribution expenses for the Funds, distribution fees may be
paid out of Fund assets, possibly causing the cost of your investment to
increase over time.

Master-Feeder Structure
- --------------------------------------

The Funds operate under a master-feeder structure. This means that each Fund is
a "feeder" fund that invests all of its investable assets in a "master" fund
with the same investment objective. The "master" fund purchases securities for
investment. The master-feeder structure works as follows:

                                    [CHART]

Each Fund can withdraw its investment in its corresponding Portfolio at any time
if the Board determines that it is in the best interest of the Fund and its
shareholders to do so. If this happens, the Fund's assets will be invested
according to the investment policies and restrictions described in this
Prospectus.

Financial Highlights
- ---------------------------------

The financial highlights tables are intended to help you understand each Fund's
financial performance for the past five fiscal years (or, if shorter, the period
of the Fund's operations). Certain information reflects financial results for a
single Fund share. The total returns in the table represent the rate that an
investor would have earned (or lost) on an investment in the Fund (assuming
reinvestment of all dividends and distributions). Except for the S&P 500 Index
Fund, each Fund's highlights were audited by Ernst & Young LLP, independent
auditors. The financial highlights of the S&P 500 Index Fund were audited by
PricewaterhouseCoopers LLP, independent auditors. More financial information
about the Funds is found in their Annual Report, which you may obtain upon
request.

- --------------------------------------------------------------------------------

Prospectus                             33                 Additional Information
<PAGE>   76

<TABLE>
<CAPTION>
                                                                           BALANCED FUND-PLANAHEAD CLASS
                                                              -------------------------------------------------------
                                                                              YEAR ENDED OCTOBER 31,
                                                              -------------------------------------------------------
                                                              1999(A)    1998(A)    1997(A)    1996(A B)    1995(A C)
       FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD:         -------    -------    -------    ---------    ---------
<S>                                                           <C>        <C>        <C>        <C>          <C>
Net asset value, beginning of period........................  $ 14.35    $ 16.03    $ 15.03     $ 13.90      $12.35
                                                              -------    -------    -------     -------      ------
Income from investment operations
  Net investment income.....................................     0.44(E)    0.47(E)    0.63(E)     0.57(E)     0.54
  Net gains (losses) on securities (realized and
    unrealized).............................................    (0.39)(E)    0.75(E)    2.10(E)     1.56(E)    1.67
                                                              -------    -------    -------     -------      ------
Total from investment operations............................     0.05       1.22       2.73        2.13        2.21
                                                              -------    -------    -------     -------      ------
Less distributions:
  Dividends from net investment income......................    (0.44)     (0.64)     (0.57)      (0.56)      (0.52)
  Distributions from net realized gains on securities.......    (1.17)     (2.26)     (1.16)      (0.44)      (0.14)
                                                              -------    -------    -------     -------      ------
Total distributions.........................................    (1.61)     (2.90)     (1.73)      (1.00)      (0.66)
                                                              -------    -------    -------     -------      ------
Net asset value, end of period..............................  $ 12.79    $ 14.35    $ 16.03     $ 15.03      $13.90
                                                              =======    =======    =======     =======      ======
Total return................................................     0.22%      8.73%     19.75%      16.01%      19.06%
                                                              =======    =======    =======     =======      ======
Ratios and supplemental data:
  Net assets, end of period (in thousands)..................  $22,753    $40,717    $34,354     $18,000      $5,450
  Ratios to average net assets (annualized)
    Expenses................................................     0.90%(E)   0.89%(E)   0.90%(E)    0.97%(E)    0.99%
    Net investment income...................................     3.21%(E)   3.23%(E)   3.52%(E)    3.64%(E)    3.70%
  Decrease reflected in above expense ratio due to
    absorption of expenses by the Manager...................       --         --         --          --        0.10%
Portfolio turnover rate(D)..................................       90%        87%       105%         76%         73%
</TABLE>

(A)  Class expenses per share were subtracted from net investment income per
     share for the Fund before class expenses to determine net investment income
     per share.

(B)  Capital Guardian Trust Company was replaced by Brandywine Asset Management,
     Inc. as an investment adviser to the Balanced Fund on April 1, 1996.

(C)  GSB Investment Management, Inc. was added as an investment adviser to the
     Balanced Fund as of January 1, 1995.

(D)  On November 1, 1995, the American AAdvantage Balanced Fund invested all of
     its investable assets in its corresponding Portfolio. Portfolio turnover
     rate since November 1, 1995 is that of the Portfolio.

(E)  The per share amounts and ratios reflect income and expenses assuming
     inclusion of the Fund's proportionate share of the income and expenses of
     the AMR Investment Services Balanced Portfolio.

<TABLE>
<CAPTION>
                                                                     LARGE CAP VALUE FUND-PLANAHEAD CLASS
                                                              ---------------------------------------------------
                                                                            YEAR ENDED OCTOBER 31,
                                                              ---------------------------------------------------
                                                              1999(A E)   1998(A)   1997(A)   1996(A B)   1995(A)
       FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD:         ---------   -------   -------   ---------   -------
<S>                                                           <C>         <C>       <C>       <C>         <C>
Net asset value, beginning of period........................   $ 20.67    $ 21.38   $ 18.33    $ 15.81    $ 14.17
                                                               -------    -------   -------    -------    -------
Income from investment operations
  Net investment income.....................................   0.35(D)       0.35(D)    0.35(D)     0.39(D)    0.40
  Net gains on securities (realized and unrealized).........   0.01(D)       0.86(D)    4.39(D)     3.10(D)    2.22
                                                               -------    -------   -------    -------    -------
Total from investment operations............................      0.36       1.21      4.74       3.49       2.62
                                                               -------    -------   -------    -------    -------
Less distributions:
  Dividends from net investment income......................     (0.36)     (0.34)    (0.38)     (0.40)     (0.44)
  Distributions from net realized gains on securities.......     (2.26)     (1.58)    (1.31)     (0.57)     (0.54)
                                                               -------    -------   -------    -------    -------
Total distributions.........................................     (2.62)     (1.92)    (1.69)     (0.97)     (0.98)
                                                               -------    -------   -------    -------    -------
Net asset value, end of period..............................   $ 18.41    $ 20.67   $ 21.38    $ 18.33    $ 15.81
                                                               =======    =======   =======    =======    =======
Total return................................................      1.41%      5.94%    27.64%     22.98%     20.14%
                                                                          =======   =======    =======    =======
Ratios and supplemental data:
  Net assets, end of period (in thousands)..................   $20,095    $40,907   $29,684    $16,084    $ 4,821
  Ratios to average net assets (annualized)
    Expenses................................................      0.90%(D)   0.86%(D)  0.93%(D)   0.94%(D)   0.99%
    Net investment income...................................      1.62%(D)   1.58%(D)  1.85%(D)   2.16%(D)   2.23%
  Decrease reflected in above expense ratio due to
    absorption of expenses by the Manager...................        --         --        --       0.02%      0.09%
Portfolio turnover rate(C)..................................        33%        40%       35%        40%        26%
</TABLE>

(A)  Class expenses per share were subtracted from net investment income per
     share for the Fund before class expenses to determine net investment income
     per share.

(B)  Capital Guardian Trust Company was replaced by Brandywine Asset Management,
     Inc. as an investment adviser to the Large Cap Value Fund on April 1, 1996.

(C)  On November 1, 1995, the American AAdvantage Large Cap Value Fund invested
     all of its investable assets in its corresponding Portfolio. Portfolio
     turnover rate since November 1, 1995 is that of the Portfolio.

(D)  The per share amounts and ratios reflect income and expenses assuming
     inclusion of the Fund's proportionate share of the income and expenses of
     the AMR Investment Services Large Cap Value Portfolio.

(E)  Prior to March 1, 1999, the Large Cap Value Fund was known as the Growth
     and Income Fund.

- --------------------------------------------------------------------------------

Additional Information                 34                             Prospectus
<PAGE>   77

<TABLE>
<CAPTION>
                                                              SMALL CAP VALUE FUND-
                                                                 PLANAHEAD CLASS
                                                              ---------------------
                                                                   MARCH 1 TO
                                                                OCTOBER 31, 1999
       FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD:         ---------------------
<S>                                                           <C>
Net asset value, beginning of period........................         $ 9.13
                                                                     ------
Income from investment operations:
  Net investment income(A)..................................           0.02
  Net gains (losses) on securities (both realized and
    unrealized)(A)..........................................          (0.10)
                                                                     ------
Total from investment operations............................          (0.08)
                                                                     ------
Less distributions:
  Dividends from net investment income......................             --
  Distributions from net realized gains on securities.......             --
                                                                     ------
Total distributions.........................................             --
                                                                     ------
Net asset value, end of period..............................         $ 9.05
                                                                     ======
Total return (not annualized)...............................          (0.88)%
                                                                     ======
Ratios and supplemental data:
  Net assets, end of period (in thousands)..................         $   74
  Ratios to average net assets (annualized)(A):
    Expenses................................................          1.28%
    Net investment income...................................          0.57%
    Decrease reflected in above expense ratio due to
     absorption of expenses by the Manager..................          0.18%
Portfolio turnover rate(B)..................................            31%
</TABLE>

(A)The per share amounts and ratios reflect income and expenses assuming
   inclusion of the Fund's proportionate share of the income and expenses of the
   AMR Investment Services Small Cap Value Portfolio.

(B)The American AAdvantage Small Cap Value Fund invests all of its investable
   assets in its corresponding Portfolio. Portfolio turnover rate is that of the
   Portfolio.

<TABLE>
<CAPTION>
                                                                    INTERNATIONAL EQUITY FUND-PLANAHEAD CLASS
                                                              -----------------------------------------------------
                                                                             YEAR ENDED OCTOBER 31,
                                                              -----------------------------------------------------
                                                              1999(A B)    1998(A)    1997(A)    1996(A)    1995(A)
       FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD:         ---------    -------    -------    -------    -------
<S>                                                           <C>          <C>        <C>        <C>        <C>
Net asset value, beginning of period........................   $ 16.75     $ 16.92    $ 14.90    $13.20     $12.85
                                                               -------     -------    -------    ------     ------
Income from investment operations
  Net investment income.....................................      0.30(D)     0.31(D)    0.30(D)   0.26(D)    0.24
  Net gains on securities (realized and unrealized).........      2.89(D)     0.31(D)    2.41(D)   1.92(D)    0.64
                                                               -------     -------    -------    ------     ------
Total from investment operations............................      3.19        0.62       2.71      2.18       0.88
                                                               -------     -------    -------    ------     ------
Less distributions:
  Dividends from net investment income......................     (0.32)      (0.31)     (0.28)    (0.24)     (0.21)
  Distributions from net realized gains on securities.......     (0.49)      (0.48)     (0.41)    (0.24)     (0.32)
                                                               -------     -------    -------    ------     ------
Total distributions.........................................     (0.81)      (0.79)     (0.69)    (0.48)     (0.53)
                                                               -------     -------    -------    ------     ------
Net asset value, end of period..............................     19.13     $ 16.75    $ 16.92    $14.90     $13.20
                                                               =======     =======    =======    ======     ======
Total return................................................     19.68%       3.94%     18.71%    16.95%      7.37%
                                                               =======     =======    =======    ======     ======
Ratios and supplemental data:
  Net assets, end of period (in thousands)..................   $60,602     $46,242    $20,075    $7,138     $1,456
  Ratios to average net assets (annualized)
    Expenses................................................      0.93%(D)    1.08%(D)   1.14%(D)  1.17%(D)   1.33%
    Net investment income...................................       171%(C)    1.72%(D)   1.95%(D)  1.76%(D)   2.08%
Portfolio turnover rate(C)..................................        63%         24%        15%       19%        21%
</TABLE>

(A)Class expenses per share were subtracted from net investment income per share
   for the Fund before class expenses to determine net investment income per
   share.

(B)On March 1, 1999, Morgan Stanley Asset Management, Inc. was replaced as an
   investment advisor to the International Equity Fund by Lazard Asset
   Management and Independence Investment Associates.

(C)On November 1, 1995, the American AAdvantage International Equity Fund
   invested all of its investable assets in its corresponding Portfolio.
   Portfolio turnover rate since November 1, 1995 is that of the Portfolio.

(D)The per share amounts and ratios reflect income and expenses assuming
   inclusion of the Fund's proportionate share of the income and expenses of the
   AMR Investment Services International Equity Portfolio.

- --------------------------------------------------------------------------------

Prospectus                             35                 Additional Information
<PAGE>   78

<TABLE>
<CAPTION>
                                                                  S&P 500 INDEX FUND-
                                                                  PLANAHEAD CLASS(A)
                                                              ---------------------------
                                                               YEAR ENDED    MARCH 1, TO
                                                              DECEMBER 31,   DECEMBER 31,
                                                                  1999         1998(B)
       FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD:         ------------   ------------
<S>                                                           <C>            <C>
Net asset value, beginning of period........................     $16.83         $14.27
Income from investment operations
  Net investment income(C)..................................       0.15           0.08
  Net gains (losses) on securities (realized and
    unrealized)(C)..........................................       3.25           2.56
                                                                 ------         ------
Total from investment operations............................       3.40           2.64
                                                                 ------         ------
Less distributions:
  Dividends from net investment income......................      (0.11)         (0.08)
                                                                                ------
Total distributions.........................................      (0.11)         (0.08)
                                                                                ------
Net asset value, end of period..............................     $20.12         $16.83
                                                                 ======         ======
Total return (not annualized)...............................     20.24%          18.58%
                                                                 ======         ======
Ratios and supplemental data:
  Net assets, end of period (in thousands)..................     $6,173         $1,963
  Ratios to average net assets (annualized)(C)
    Net investment income...................................       0.91%          1.04%
    Expenses................................................       0.55%          0.55%
    Decrease reflected in above expense ratio due to
     absorption of expenses by Bankers Trust and the
     Manager................................................       0.17%          0.24%
Portfolio turnover rate(D)..................................         13%             4%
</TABLE>

(A)Prior to March 1, 2000, the S&P 500 Index Fund-PlanAhead Class invested all
   of its investable assets in the BT Equity 500 Index Portfolio, a separate
   investment company managed by Bankers Trust Company.

(B)The S&P 500 Index Fund-PlanAhead Class commenced active operations on March
   1, 1998.

(C)The per share amounts and ratios reflect income and expenses assuming
   inclusion of the Fund's proportionate share of the income and expenses of the
   BT Equity 500 Index Portfolio.

(D)Portfolio turnover rate is that of the BT Equity 500 Index Portfolio.

<TABLE>
<CAPTION>
                                                                  INTERMEDIATE BOND
                                                                   FUND-PLANAHEAD
                                                                        CLASS
                                                              -------------------------
                                                              YEAR ENDED    MARCH 2 TO
                                                              OCTOBER 31,   OCTOBER 31,
                                                                 1999          1998
       FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD:         -----------   -----------
<S>                                                           <C>           <C>
Net asset value, beginning of period........................    $10.55        $10.25
Income from investment operations
  Net investment income(A)..................................      0.53          0.37
  Net gains (losses) on securities (realized and
    unrealized)(A)..........................................     (0.63)         0.30
                                                                              ------
Total from investment operations............................     (0.10)         0.67
                                                                ------        ------
Less distributions:
  Dividends from net investment income......................     (0.53)        (0.37)
  Distributions from net realized gains on securities.......     (0.29)           --
                                                                ------        ------
Total distributions.........................................     (0.82)        (0.37)
                                                                ------        ------
Net asset value, end of period..............................    $ 9.63        $10.55
                                                                ======        ======
Total return (annualized)...................................     (0.98)%        6.63%
                                                                ======        ======
Ratios and supplemental data:
  Net assets, end of period (in thousands)..................    $1,545        $   30
  Ratios to average net assets (annualized)(A)
    Expenses................................................      0.85%         0.86%
    Net investment income...................................      5.32%         5.21%
Portfolio turnover rate(B)..................................       123%          181%
</TABLE>

(A)The per share amounts and ratios reflect income and expenses assuming
   inclusion of the Fund's proportionate share of the income and expenses of the
   AMR Investment Services Intermediate Bond Portfolio.

(B)The American AAdvantage Intermediate Bond Fund invests all of its investable
   assets in its corresponding Portfolio. Portfolio turnover rate is that of the
   Portfolio.

- --------------------------------------------------------------------------------

Additional Information                 36                             Prospectus
<PAGE>   79

<TABLE>
<CAPTION>
                                                                   SHORT-TERM BOND FUND-PLANAHEAD CLASS
                                                              -----------------------------------------------
                                                                          YEAR ENDED OCTOBER 31,
                                                              -----------------------------------------------
                                                               1999     1998(A)     1997      1996      1995
       FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD:         ------    -------    ------    ------    ------
<S>                                                           <C>       <C>        <C>       <C>       <C>
Net asset value, beginning of period........................  $ 9.64    $ 9.63     $ 9.68    $ 9.82    $ 9.68
                                                              ------    ------     ------    ------    ------
Income from investment operations
  Net investment income.....................................    0.54(C)   0.60(C)    0.61(C)   0.60(C)   0.59
  Net gains (losses) on securities (realized and
    unrealized).............................................   (0.33)(C)   0.01(C)  (0.05)(C)  (0.14)(C)   0.14
                                                              ------    ------     ------    ------    ------
Total from investment operations............................    0.21      0.61       0.56      0.46      0.73
                                                              ------    ------     ------    ------    ------
Less distributions:
  Dividends from net investment income......................   (0.55)    (0.60)     (0.61)    (0.60)    (0.59)
  Distributions from net realized gains on securities.......      --        --         --        --        --
                                                              ------    ------     ------    ------    ------
Total distributions.........................................   (0.55)    (0.60)     (0.61)    (0.60)    (0.59)
                                                              ------    ------     ------    ------    ------
Net asset value, end of period..............................  $ 9.30    $ 9.64     $ 9.63    $ 9.68    $ 9.82
                                                              ======    ======     ======    ======    ======
Total return................................................    2.21%     6.50%      6.01%     4.83%     7.83%
                                                              ======    ======     ======    ======    ======
Ratios and supplemental data:
  Net assets, end of period (in thousands)..................  $1,638    $3,722     $5,096    $3,399    $1,576
  Ratios to average net assets (annualized)
    Expenses................................................    0.84%(C)  0.85%(C)   0.85%(C)  0.85%(C)  0.83%
    Net investment income...................................    5.75%(C)  6.24%(C)   6.36%(C)  6.11%(C)  6.16%
  Decrease reflected in above expense ratio due to
    absorption of expenses by the Manager...................    0.09%     0.08%      0.05%     0.09%     0.23%
Portfolio turnover rate(B)..................................     115%       74%       282%      304%      183%
</TABLE>

(A)Prior to March 1, 1998, the American AAdvantage Short-Term Bond Fund was
   known as the American AAdvantage Limited-Term Income Fund.

(B)On November 1, 1995 the Short-Term Bond Fund began investing all of its
   investable assets in its corresponding Portfolio. Portfolio turnover rate
   since November 1, 1995 is that of the Portfolio.

(C)The per share amounts and ratios reflect income and expenses assuming
   inclusion of the Fund's proportionate share of the income and expenses of the
   AMR Investment Services Short-Term Bond Portfolio.

<TABLE>
<CAPTION>
                                                                       MONEY MARKET FUND-PLANAHEAD CLASS
                                                  ----------------------------------------------------------------------------
                                                     TWO MONTHS                        YEAR ENDED OCTOBER 31,
                                                        ENDED          -------------------------------------------------------
FOR A SHARE OUTSTANDING THROUGHOUT THE            DECEMBER 31, 1999      1999        1998        1997        1996       1995
PERIOD:                                           -----------------    --------    --------    --------    --------    -------
<S>                                               <C>                  <C>         <C>         <C>         <C>         <C>
Net asset value, beginning of period............      $   1.00         $   1.00    $   1.00    $   1.00    $   1.00    $  1.00
                                                      --------         --------    --------    --------    --------    -------
  Net investment income.........................          0.01(A)          0.05(A)     0.05(A)     0.05(A)     0.05(A)    0.05
  Less dividends from net investment income.....         (0.01)           (0.05)      (0.05)      (0.05)      (0.05)     (0.05)
                                                      --------         --------    --------    --------    --------    -------
Net asset value, end of period..................      $   1.00         $   1.00    $   1.00    $   1.00    $   1.00    $  1.00
                                                      ========         ========    ========    ========    ========    =======
Total return (not annualized)...................          0.89%(B)         4.79%       5.31%       5.28%       5.21%      5.60%
                                                      ========         ========    ========    ========    ========    =======
Ratios and supplemental data:
  Net assets, end of period (in thousands)......      $262,748         $343,532    $288,759    $189,189    $106,890    $41,989
  Ratios to average net assets (annualized)
    Expenses....................................          0.55%(A)         0.53%(A)    0.53%(A)    0.54%(A)    0.58%(A)   0.55%
    Net investment income.......................          5.32%(A)         4.69%(A)    5.18%(A)    5.17%(A)    5.06%(A)   5.56%
</TABLE>

(A) The per share amounts and ratios reflect income and expenses assuming
    inclusion of the Fund's proportionate share of the income and expenses of
    its corresponding Portfolio.

(B) Not annualized

- --------------------------------------------------------------------------------

Prospectus                             37                 Additional Information
<PAGE>   80

<TABLE>
<CAPTION>
                                                                      U.S. GOVERNMENT MONEY MARKET FUND-PLANAHEAD CLASS
                                                              ------------------------------------------------------------------
                                                               TWO MONTHS
                                                                 ENDED                      YEAR ENDED OCTOBER 31,
                                                              DECEMBER 31,    --------------------------------------------------
                                                                  1999          1999       1998      1997(B)     1996      1995
FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD:                ------------    --------    -------    -------    ------    ------
<S>                                                           <C>             <C>         <C>        <C>        <C>       <C>
Net asset value, beginning of period........................    $  1.00       $   1.00    $  1.00    $ 1.00     $ 1.00    $ 1.00
                                                                -------       --------    -------    ------     ------    ------
  Net investment income.....................................       0.01(A)        0.05(A)    0.05(A)   0.05(A)    0.05(A)   0.05
  Less dividends from net investment income.................      (0.01)         (0.05)     (0.05)    (0.05)     (0.05)    (0.05)
                                                                -------       --------    -------    ------     ------    ------
Net asset value, end of period..............................    $  1.00       $   1.00    $  1.00    $ 1.00     $ 1.00    $ 1.00
                                                                =======       ========    =======    ======     ======    ======
Total return (not annualized)...............................       0.86%(C)       4.56%      5.13%     5.08%      4.94%     5.19%
                                                                =======       ========    =======    ======     ======    ======
Ratios and supplemental data:
  Net assets, end of period (in thousands)..................    $59,560       $ 59,960    $99,869    $4,046     $1,822    $  530
  Ratios to average net assets (annualized)
    Expenses................................................       0.64%(A)       0.56%(A)   0.57%(A)  0.52%(A)   0.67%(A)  0.76%
    Net investment income...................................       5.15%(A)       4.45%(A)   5.01%(A)  5.00%(A)   4.74%(A)  5.19%
</TABLE>

(A) The per share amounts and ratios reflect income and expenses assuming
    inclusion of the Fund's proportionate share of the income and expenses of
    its corresponding Portfolio.

(B) Prior to March 1, 1997, the American AAdvantage U.S. Government Money Market
    Fund was known as the American AAdvantage U.S. Treasury Money Market Fund
    and operated under different investment policies.

(C) Not annualized.

<TABLE>
<CAPTION>
                                                                    MUNICIPAL MONEY MARKET FUND-PLANAHEAD CLASS()
                                                       -----------------------------------------------------------------------
                                                        TWO MONTHS
                                                          ENDED                        YEAR ENDED OCTOBER 31,
                                                       DECEMBER 31,    -------------------------------------------------------
                                                           1999          1999        1998        1997        1996       1995
FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD:         ------------    --------    --------    --------    --------    -------
<S>                                                    <C>             <C>         <C>         <C>         <C>         <C>
Net asset value, beginning of period.................    $  1.00       $   1.00    $   1.00    $   1.00    $   1.00    $  1.00
                                                         -------       --------    --------    --------    --------    -------
Net investment income................................       0.01(A)        0.03(A)     0.03(A)     0.03(A)     0.03(A)    0.03
Less dividends from net investment income............      (0.01)         (0.03)      (0.03)      (0.03)      (0.03)     (0.03)
                                                         -------       --------    --------    --------    --------    -------
Net asset value, end of period.......................    $  1.00       $   1.00    $   1.00    $   1.00    $   1.00    $  1.00
                                                         =======       ========    ========    ========    ========    =======
Total return (not annualized)........................       0.52%(B)       2.68%       3.17%       3.24%       3.27%      3.39%
                                                         =======       ========    ========    ========    ========    =======
Ratios and supplemental data:
  Net assets, end of period (in thousands)...........    $ 7,479       $  9,795    $ 13,474    $  9,590    $  2,340    $   129
  Ratios to average net assets (annualized)
    Expenses.........................................       0.73%(A)       0.65%(A)    0.64%(A)    0.60%(A)    0.62%(A)   0.72%
    Net investment income............................       3.09%(A)       2.61%(A)    3.07%(A)    3.18%(A)    3.12%(A)   3.32%
  Decrease reflected in above expense ratio due to
    absorption of expenses by the Manager............         --             --          --        0.01%       0.06%      0.20%
</TABLE>

(A) The per share amounts and ratios reflect income and expenses assuming
    inclusion of the Fund's proportionate share of the income and expenses of
    its corresponding Portfolio.

(B) Not annualized.

- --------------------------------------------------------------------------------

Additional Information                 38                             Prospectus
<PAGE>   81

                                  -- Notes --
<PAGE>   82

ADDITIONAL INFORMATION

Additional information about the Funds is found in the documents listed below.
Request a free copy of these documents by calling (800) 388-3344.



ANNUAL REPORT/SEMI-ANNUAL REPORT

The Funds' Annual and Semi-Annual Reports list each Fund's actual investments as
of the report's date. They also include a discussion by the Manager of market
conditions and investment strategies that significantly affected the Funds'
performance. The report of the Funds' independent auditors is included in the
Annual Report.

STATEMENT OF ADDITIONAL INFORMATION ("SAI")

The SAI contains more details about the Funds and their investment policies. The
SAI is incorporated in this Prospectus by reference (it is legally part of this
Prospectus). A current SAI is on file with the Securities and Exchange
Commission (SEC).

TO OBTAIN MORE INFORMATION ABOUT THE FUNDS OR TO REQUEST A COPY OF THE DOCUMENTS
LISTED ABOVE:


<TABLE>
<S>                  <C>                              <C>                                     <C>
      [PHONE]                  [MAILBOX]                           [KEYBOARD]                               [MOUSE]

   By Telephone:               By Mail:                            By E-mail:
Call (800) 388-3344   American AAdvantage Funds        [email protected]             On the Internet:
                       P.O. Box 619003, MD5645                                                Visit our website at www.aafunds.com
                      DFW Airport, TX 75261-9003                                              Visit the SEC website at www.sec.gov
</TABLE>


Copies of these documents may also be obtained from the SEC Public Reference
Room by mailing a request, including a duplicating fee to: SEC's Public
Reference Section, 450 5th Street NW, Washington, D.C. 20549-6009. The Public
Reference Room can be reached at (202) 942-8090.


FUND SERVICE PROVIDERS:

<TABLE>
<S>                      <C>                          <C>                      <C>
CUSTODIAN                  TRANSFER AGENT             INDEPENDENT AUDITORS      DISTRIBUTOR
STATE STREET BANK          NATIONAL FINANCIAL         ERNST & YOUNG LLP         SWS FINANCIAL SERVICES
  AND TRUST                 DATA SERVICES             Dallas, Texas             Dallas, Texas
Boston, Massachusetts      Kansas City, Missouri
</TABLE>

                        [AMERICAN AADVANTAGE FUNDS LOGO]

                            SEC File Number 811-4984

American Airlines is not responsible for investments made in the American
AAdvantage Funds. American AAdvantage Funds is a registered service mark of AMR
Corporation. PlanAhead Class is a registered service mark of AMR Investment
Services, Inc. American AAdvantage Balanced Fund, American AAdvantage Large Cap
Value Fund, American AAdvantage International Equity Fund, American AAdvantage
Intermediate Bond Fund, American AAdvantage Short-Term Bond Fund, American
AAdvantage Small Cap Value Fund, American AAdvantage Money Market Fund, American
AAdvantage Municipal Money Market Fund, and American AAdvantage U.S. Government
Money Market Fund are service marks of AMR Investment Services, Inc. Russell
2000 is a registered service mark of the Frank Russell Company.

<PAGE>   83
                        [AMERICAN AADVANTAGE FUNDS LOGO]

                                   [AMR LOGO]

                                   PROSPECTUS
                                 MARCH 1, 2000

AMR CLASS

o    BALANCED FUND

o    LARGE CAP VALUE FUND

o    SMALL CAP VALUE FUND

o    INTERNATIONAL EQUITY FUND

o    INTERMEDIATE BOND FUND

o    SHORT-TERM BOND FUND


INSTITUTIONAL CLASS

o    S&P 500 INDEX FUND





The Securities and Exchange Commission does not guarantee that the information
in this Prospectus or any other mutual fund's prospectus is accurate or
complete, nor does it judge the invetment mreit of these Funds. To state
otherwise is a crimial offense.

<PAGE>   84

                   [AMERICAN AADVANTAGE FUNDS AMR CLASS LOGO]

TABLE OF CONTENTS

<TABLE>
<S>                                               <C>
About the Funds
Overview........................................    2
Balanced Fund...................................    3
Large Cap Value Fund............................    6
Small Cap Value Fund............................    8
International Equity Fund.......................   10
S&P 500 Index Fund..............................   12
Intermediate Bond Fund..........................   14
Short-Term Bond Fund............................   17
The Manager.....................................   19
Equity 500 Index Portfolio Administrator........   19
The Investment Advisers.........................   19
Valuation of Shares.............................   20
About Your Investment
Purchase and Redemption of Shares...............   21
Distributions and Taxes.........................   23
Additional Information
Distribution of Trust Shares....................   23
Master-Feeder Structure.........................   24
Financial Highlights............................   24
Additional Information.....................Back Cover
</TABLE>

ABOUT THE FUNDS
- ------------------------------------------------------------

Overview

The American AAdvantage Funds (the "Funds") are managed by AMR Investment
Services, Inc. (the "Manager"), a wholly owned subsidiary of AMR Corporation.

The Funds operate under a master-feeder structure. This means that each Fund,
except for the S&P 500 Index Fund, seeks its investment objective by investing
all of its investable assets in a corresponding Portfolio of the AMR Investment
Services Trust ("AMR Trust") that has a similar name and identical investment
objective. The S&P 500 Index Fund invests all of its investable assets in the
State Street Equity 500 Index Portfolio ("Equity 500 Index Portfolio"), which is
a separate investment company with an identical investment objective, managed by
State Street Bank and Trust Company ("State Street"), through its State Street
Global Advisors division. Throughout this Prospectus, statements regarding
investments by a Fund refer to investments made by its corresponding Portfolio.
For easier reading, the term "Fund" is used throughout the Prospectus to refer
to either a Fund or its Portfolio, unless stated otherwise. See "Master-Feeder
Structure".

- --------------------------------------------------------------------------------

About the Funds                         2                             Prospectus
<PAGE>   85

AMERICAN AADVANTAGE

BALANCED FUND(SM)
- --------------------------------------------------------------------------------

Investment Objective
- -------------------------------

Income and capital appreciation.

Principal Strategies
- ------------------------------

This Fund typically invests between 50% and 65% of its total assets in equity
securities and between 35% and 50% of its total assets in debt securities.

The Fund's equity investments may include common stocks, preferred stocks,
securities convertible into common stocks, and U.S. dollar-denominated American
Depositary Receipts (collectively referred to as "stocks").

The Fund's investment advisers select stocks which, in their opinion, have most
or all of the following characteristics:

- - above-average earnings growth potential,
- - below-average price to earnings ratio,
- - below-average price to book value ratio, and
- - above-average dividend yields.

Each of the Fund's investment advisers determines the earnings growth prospects
of companies based upon a combination of internal and external research using
fundamental analysis and considering changing economic trends. The decision to
sell a stock is typically based on the belief that the company is no longer
considered undervalued or shows deteriorating fundamentals, or that better
investment opportunities exist in other stocks. The Manager believes that this
strategy will help the Fund outperform other investment styles over the longer
term while minimizing volatility and downside risk.

One of the investment advisers utilizes an "amplified alpha" approach in
determining which equity securities to buy and sell. This approach attempts to
amplify the outperformance expected from the best ideas of the other investment
advisers by concentrating assets in those stocks that are overweighted in the
aggregate of the advisers' portfolios when compared to a relevant market index.

The Fund's investments in debt securities may include: obligations of the U.S.
Government, its agencies and instrumentalities; U.S. corporate debt securities,
such as notes and bonds; mortgage-backed securities; asset-backed securities;
master-demand notes; Yankeedollar and Eurodollar bank certificates of deposit,
time deposits, bankers' acceptances, commercial paper and other notes; and other
debt securities. The Fund will only buy debt securities that are investment
grade at the time of purchase. Investment grade securities include securities
issued or guaranteed by the U.S. Government, its agencies and instrumentalities,
as well as securities rated in one of the four highest rating categories by all
nationally recognized statistical rating organizations rating that security
(such as Standard & Poor's Corporation or Moody's Investors Service, Inc.).
Obligations rated in the fourth highest rating category are limited to 25% of
the Fund's total assets. The Fund, at the discretion of the applicable
investment adviser, may retain a security that has been downgraded below the
initial investment criteria.

In determining which debt securities to buy and sell, the investment advisers
generally use a "top-down" or "bottom-up" investment strategy or a combination
of both strategies.

The top-down fixed income investment strategy is implemented as follows:

- - Develop an overall investment strategy, including a portfolio duration target,
  by examining the current trend in the U.S. economy.
- - Set desired portfolio maturity structure by comparing the differences between
  corporate and U.S. Government securities of similar duration to judge their
  potential for optimal return in accordance with the target duration benchmark.
- - Determine the weightings of each security type by analyzing the difference in
  yield spreads between corporate and U.S. Government securities.
- - Select specific debt securities within each security type.
- - Review and monitor portfolio composition for changes in credit, risk-return
  profile and comparisons with benchmarks.

The bottom-up fixed income investment strategy is implemented as follows:

- - Search for eligible securities with a yield to maturity advantage versus a
  U.S. Government security with a similar maturity.
- - Evaluate credit quality of the securities.
- - Perform an analysis of the expected price volatility of the securities to
  changes in interest rates by examining actual price volatility between U.S.
  Government and non-U.S. Government securities.

Under adverse market conditions, the Fund may, for temporary defensive purposes,
invest up to 100% of its assets in cash or cash equivalents, including
investment grade short-term obligations. To the ex-

- --------------------------------------------------------------------------------

Prospectus                              3                        About the Funds
<PAGE>   86
AMERICAN AADVANTAGE
BALANCED FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

tent that the Fund invokes this strategy, its ability to achieve its investment
objective may be affected adversely.

Risk Factors
- -------------------

MARKET RISK (STOCKS)
Since this Fund invests a substantial portion of its assets in stocks, it is
subject to stock market risk. Market risk involves the possibility that the
value of the Fund's investments in stocks will decline due to drops in the stock
market. In general, the value of the Fund will move in the same direction as the
overall stock market, which will vary from day to day in response to the
activities of individual companies and general market and economic conditions.

INTEREST RATE RISK (BONDS)
The Fund is subject to the risk that the market value of the bonds it holds will
decline due to rising interest rates. When interest rates rise, the prices of
most bonds go down. When interest rates go down, bond prices generally go up.
The price of a bond is also affected by its maturity. Bonds with longer
maturities generally have greater sensitivity to changes in interest rates.

CREDIT RISK (BONDS)
The Fund is subject to the risk that the issuer of a bond will fail to make
timely payment of interest or principal. A decline in an issuer's credit rating
can cause its price to go down. This risk is somewhat minimized by the Fund's
policy of only investing in bonds that are considered investment grade at the
time of purchase.

PREPAYMENT RISK (BONDS)
The Fund's investments in asset-backed and mortgage-backed securities are
subject to the risk that the principal amount of the underlying collateral may
be repaid prior to the bond's maturity date. If this occurs, no additional
interest will be paid on the investment and the Fund may have to invest at a
lower rate.

ADDITIONAL RISKS
An investment in the Fund is not a deposit of a bank and is not insured or
guaranteed by the Federal Deposit Insurance Corporation or any other government
agency. The value of an investment in the Fund will fluctuate up and down. When
you sell your shares of the Fund, they could be worth less than what you paid
for them.

Historical Performance
- -----------------------------------

The bar chart and table below provide an indication of risk by showing how the
Fund's performance has varied from year to year. The table shows how the Fund's
performance compares to three broad-based market indices and the Lipper Balanced
Index, a composite of mutual funds with the same investment objective as the
Fund. The AMR Class of the Fund began offering its shares on August 1, 1994.
However, another class of shares of the Fund not offered in this prospectus, has
been offered since July 17, 1987. In the chart and table below, performance
results before August 1, 1994 are for the older class. Because the other class
had slightly higher expenses, its performance was slightly lower than the AMR
Class of the Fund would have realized in the same period. Past performance is
not necessarily indicative of how the Fund will perform in the future.

                                    [GRAPH]

          TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>
90..........................................................    0.29%
91..........................................................   21.22%
92..........................................................    8.97%
93..........................................................   14.46%
94..........................................................   -1.74%
95..........................................................   29.35%
96..........................................................   14.04%
97..........................................................   20.23%
98..........................................................    8.50%
99..........................................................   -3.33%
</TABLE>

<TABLE>
<S>                               <C>
Highest Quarterly Return:               10.02%
  (1/1/90 through 12/31/99)       (2nd Quarter 1997)
Lowest Quarterly Return:                -7.65%
  (1/1/90 through 12/31/99)       (3rd Quarter 1999)
</TABLE>

- --------------------------------------------------------------------------------

About the Funds                         4                             Prospectus
<PAGE>   87
AMERICAN AADVANTAGE
BALANCED FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                               AVERAGE ANNUAL TOTAL RETURN
                            ---------------------------------
                                     AS OF 12/31/99
                            ---------------------------------
                             1 YEAR     5 YEARS     10 YEARS
                            --------   ---------   ----------
<S>                         <C>        <C>         <C>
BALANCED FUND                -3.33%     13.22%       10.73%
S&P/Barra Value Index(1)     12.72%     22.94%       15.36%
S&P 500 Index(2)             20.99%     28.56%       18.21%
Lehman Bros. Intermediate
  Gov./Corp. Index(3)         0.39%      7.09%        7.26%
Lipper Balanced Index         9.00%     16.33%       12.26%
</TABLE>

(1)   The S&P/Barra Value Index is a market-value weighted index of stocks with
      book-to-price ratios in the top 50% of the S&P 500 Index.

(2)  The S&P 500 Index is an unmanaged index of common stocks publicly traded in
     the United States.

(3)  The Lehman Brothers Intermediate Gov./Corp. Index is a market value
     weighted performance benchmark for government and corporate fixed-rate debt
     issues with maturities between one and ten years.

Fees and Expenses
- ----------------------------

This table describes the fees and expenses that you may pay if you buy and hold
shares of the Balanced Fund.(1)

Annual Fund Operating Expenses
(expenses that are deducted from Fund assets)

<TABLE>
<S>                                                    <C>
Management Fees                                        0.30%
Distribution (12b-1) Fees                              0.00
Other Expenses                                         0.04
                                                       ----
TOTAL ANNUAL FUND OPERATING EXPENSES                   0.34%
                                                       ====
</TABLE>

(1)   The expense table and the Example below reflect the expenses of both the
      Fund and its corresponding Portfolio.

<TABLE>
<S> <C>                                          <C>
Example
- ----------------------------------------------------
This Example is intended to help you compare the
cost of investing in the Fund with the cost of
investing in other mutual funds. The Example assumes
that you invest $10,000 in the Fund for the time
periods indicated and then redeem all of your shares
at the end of those periods. The example also as-
sumes that your investment has a 5% return each year
and that the Fund's operating expenses remain the
same. Although your actual costs may be higher or
lower, based on these assumptions your costs would
be:
1 YEAR ..........................................$35
3 YEARS.........................................$109
5 YEARS.........................................$191
10 YEARS........................................$431
</TABLE>

Investment Advisers
- ----------------------------------

The Manager allocates the assets of the Fund among the following investment
advisers:

Barrow, Hanley, Mewhinney & Strauss, Inc.

Brandywine Asset Management, Inc.

Hotchkis and Wiley

Independence Investment Associates, Inc.

- --------------------------------------------------------------------------------

Prospectus                              5                        About the Funds
<PAGE>   88

AMERICAN AADVANTAGE

LARGE CAP VALUE FUND(SM)
- --------------------------------------------------------------------------------

Investment Objective
- -------------------------------

Long-term capital appreciation and current income.

Principal Strategies
- ------------------------------

Ordinarily at least 65% of the total assets of this Fund are invested in equity
securities of U.S. companies with market capitalizations of $5 billion or more
at the time of investment. The Fund's investments may include common stocks,
preferred stocks, securities convertible into U.S. common stocks, and U.S.
dollar-denominated American Depositary Receipts (collectively referred to as
"stocks").

The Fund's investment advisers select stocks which, in their opinion, have most
or all of the following characteristics:

- - above-average earnings growth potential,
- - below-average price to earnings ratio,
- - below-average price to book value ratio, and
- - above-average dividend yields.

Each of the Fund's investment advisers determines the earnings growth prospects
of companies based upon a combination of internal and external research using
fundamental analysis and considering changing economic trends. The decision to
sell a stock is typically based on the belief that the company is no longer
considered undervalued or shows deteriorating fundamentals, or that better
investment opportunities exist in other stocks. The Manager believes that this
strategy will help the Fund outperform other investment styles over the longer
term while minimizing volatility and downside risk.

One of the investment advisers utilizes an "amplified alpha" approach in
determining which equity securities to buy and sell. This approach attempts to
amplify the outperformance expected from the best ideas of the other investment
advisers by concentrating assets in those stocks that are overweighted in the
aggregate of the advisers' portfolios when compared to a relevant market index.

Under adverse market conditions, the Fund may, for temporary defensive purposes,
invest up to 100% of its assets in cash or cash equivalents, including
investment grade short-term obligations. To the extent that the Fund invokes
this strategy, its ability to achieve its investment objective may be affected
adversely.

Risk Factors
- -------------------

MARKET RISK
Since this Fund invests most of its assets in stocks, it is subject to stock
market risk. Market risk involves the possibility that the value of the Fund's
investments in stocks will decline due to drops in the stock market. In general,
the value of the Fund will move in the same direction as the overall stock
market, which will vary from day to day in response to the activities of
individual companies and general market and economic conditions.

ADDITIONAL RISKS
An investment in the Fund is not a deposit of a bank and is not insured or
guaranteed by the Federal Deposit Insurance Corporation or any other government
agency. The value of an investment in the Fund will fluctuate up and down. When
you sell your shares of the Fund, they could be worth less than what you paid
for them.

Historical Performance
- -----------------------------------

The bar chart and table below provide an indication of risk by showing how the
Fund's performance has varied from year to year. The table shows how the Fund's
performance compares to the S&P/Barra Value Index, a market value weighted index
of stocks with book-to-price ratios in the top 50% of the S&P 500 Index; the S&P
500 Index, a widely recognized unmanaged index of common stocks publicly traded
in the United States; and the Lipper Multi-Cap Value Index, a composite of
mutual funds with the same investment objective as the Fund. The AMR Class of
the Fund began offering its shares on August 1, 1994. However, another class of
shares of the Fund not offered in this prospectus has been offered since July
17, 1987. In the chart and table below, performance results before August 1,
1994 are for the older class. Because the other class had slightly higher
expenses, its performance was slightly lower than the AMR Class of the Fund
would have realized in the same period. Past performance is not necessa-

- --------------------------------------------------------------------------------

About the Funds                         6                             Prospectus
<PAGE>   89
AMERICAN AADVANTAGE
LARGE CAP VALUE FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

rily indicative of how the Fund will perform in the future.

                                    [GRAPH]

          TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>
90..........................................................   -5.97%
91..........................................................   26.00%
92..........................................................   11.90%
93..........................................................   15.74%
94..........................................................   -1.04%
95..........................................................   34.81%
96..........................................................   21.41%
97..........................................................   26.78%
98..........................................................    6.51%
99..........................................................   -4.44%
</TABLE>

<TABLE>
<S>                              <C>
Highest Quarterly Return:              14.21%
  (1/1/90 through 12/31/99)      (2nd Quarter 1997)
Lowest Quarterly Return:              -13.98%
  (1/1/90 through 12/31/99)      (3rd Quarter 1998)
</TABLE>

<TABLE>
<CAPTION>
                                    AVERAGE ANNUAL TOTAL
                                           RETURN
                                ----------------------------
                                       AS OF 12/31/99
                                ----------------------------
                                1 YEAR   5 YEARS    10 YEARS
                                ------   --------   --------
<S>                             <C>      <C>        <C>
LARGE CAP VALUE FUND             4.44%    16.13%     12.36%
S&P/Barra Value Index           12.72%    22.94%     15.36%
S&P 500 Index                   20.99%    28.56%     18.21%
Lipper Multi-Cap Value
  Index(1)                       5.94%    17.82%     13.03%
</TABLE>

(1)   On September 1, 1999, Lipper reclassified the Fund from the Lipper Growth
      and Income Index to the Lipper Multi-Cap Value Index.

Fees and Expenses
- ----------------------------

This table describes the fees and expenses that you may pay if you buy and hold
shares of the Large Cap Fund.(1)

Annual Fund Operating Expenses
(expenses that are deducted from Fund assets)

<TABLE>
<S>                                                   <C>
Management Fees                                       0.30%
Distribution (12b-1) Fees                             0.00
Other Expenses                                        0.04
                                                      ----
TOTAL ANNUAL FUND OPERATING EXPENSES                  0.34%
                                                      ====
</TABLE>

(1)   The expense table and the Example below reflect the expenses of both the
      Fund and its corresponding Portfolio.

<TABLE>
<S> <C>                                              <C>
Example
- --------------------------------------------------------
This Example is intended to help you compare the cost of
investing in the Fund with the cost of investing in
other mutual funds. The Example assumes that you invest
$10,000 in the Fund for the time periods indicated and
then redeem all of your shares at the end of those
periods. The Example also assumes that your investment
has a 5% return each year and that the Fund's operating
expenses remain the same. Although your actual costs may
be higher or lower, based on these assumptions your
costs would be:
1 YEAR ..............................................$35
3 YEARS.............................................$109
5 YEARS.............................................$191
10 YEARS............................................$431
</TABLE>

Investment Advisers
- ------------------------------

The Manager allocates the assets of the Fund among the following investment
advisers:

Barrow, Hanley, Mewhinney & Strauss, Inc.

Brandywine Asset Management, Inc.

Hotchkis and Wiley

Independence Investment Associates, Inc.

- --------------------------------------------------------------------------------

Prospectus                              7                        About the Funds
<PAGE>   90

AMERICAN AADVANTAGE

SMALL CAP VALUE FUND(SM)
- --------------------------------------------------------------------------------

Investment Objective
- -------------------------------

Long-term capital appreciation and current income.

Principal Strategies
- ------------------------------

Ordinarily at least 80% of the total assets of the Fund are invested in equity
securities of U.S. companies with market capitalizations of $1 billion or less
at the time of investment. The Fund's investments may include common stocks,
preferred stocks, securities convertible into common stocks, and U.S. dollar-
denominated American Depositary Receipts (collectively, "stocks").

The investment advisers select stocks which, in their opinion, have most or all
of the following characteristics:

- - above-average earnings growth potential,
- - below-average price to earnings ratio,
- - below-average price to book value ratio, and
- - above-average dividend yields.

Each of the investment advisers determines the earnings growth prospects of
companies based upon a combination of internal and external research using
fundamental analysis and considering changing economic trends. The decision to
sell a stock is typically based on the belief that the company is no longer
considered undervalued or shows deteriorating fundamentals, or that better
investment opportunities exist in other stocks. The Manager believes that this
strategy will help the Fund outperform other investment styles over the longer
term while minimizing volatility and downside risk.

Under adverse market conditions, the Fund may, for temporary defensive purposes,
invest up to 100% of its assets in cash or cash equivalents, including
investment grade short-term obligations. To the extent that the Fund invokes
this strategy, its ability to achieve its investment objective may be affected
adversely.

Risk Factors
- -------------------

MARKET RISK
Since this Fund invests most of its assets in stocks, it is subject to stock
market risk. Market risk involves the possibility that the value of the Fund's
investments in stocks will decline due to drops in the stock market. In general,
the value of the Fund will move in the same direction as the overall stock
market, which will vary from day to day in response to the activities of
individual companies and general market and economic conditions.

SMALL CAPITALIZATION COMPANIES
Investing in the securities of small capitalization companies involves greater
risk and the possibility of greater price volatility than investing in larger
capitalization and more established companies, since smaller companies may have
limited operating history, product lines, and financial resources, and the
securities of these companies may lack sufficient market liquidity.

ADDITIONAL RISKS
An investment in the Fund is not a deposit of a bank and is not insured or
guaranteed by the Federal Deposit Insurance Corporation or any other government
agency. The value of an investment in the Fund will fluctuate up and down. When
you sell your shares of the Fund, they could be worth less than what you paid
for them.

Historical Performance
- -----------------------------------

The bar chart and table below provide an indication of risk by showing how the
Fund has performed during the past year. The table shows how the Fund's
performance compares to the Russell 2000(R) Value Index, an unmanaged index of
those stocks in the Russell 2000 Index with below-average price-to-book ratios
and below-average forecasted growth values, and the Lipper Small Cap Value
Index, a composite of mutual funds with the same investment objective as the
Fund. The AMR Class of the Fund began offering its shares on March 1, 1999.
However, another class of shares of the Fund not offered in this prospectus
began offering its shares on January 1, 1999. In the chart and table below,
performance results before March 1, 1999 are for the older class. Because the
other class had lower expenses, its performance was better than the AMR Class of
the Fund would have realized in the same period. Past performance is not
necessarily indicative of how the Fund will perform in the future.

- --------------------------------------------------------------------------------

About the Funds                         8                             Prospectus
<PAGE>   91
AMERICAN AADVANTAGE
SMALL CAP VALUE FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

                                    [GRAPH]

               TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31/99

<TABLE>
<S>                                                           <C>
99..........................................................   -5.22%
</TABLE>

<TABLE>
<S>                               <C>
Highest Quarterly Return:               19.89%
  (1/1/99 through 12/31/99)       (2nd Quarter 1999)
Lowest Quarterly Return:               -11.28%
  (1/1/99 through 12/31/99)       (3rd Quarter 1999)
</TABLE>

<TABLE>
<CAPTION>
                               AVERAGE ANNUAL TOTAL RETURN
                               ---------------------------
                                     AS OF 12/31/99
                               ---------------------------
                                         1 YEAR
                               ---------------------------
<S>                            <C>
SMALL CAP VALUE FUND                      -5.22%
Russell 2000 Value Index                  -1.49%
Lipper Small Cap Value Index               1.31%
</TABLE>

Fees and Expenses
- ----------------------------

This table describes the fees and expenses that you may pay if you buy and hold
shares of the Small Cap Value Fund.(1)

Annual Fund Operating Expenses
(expenses that are deducted from Fund assets)

<TABLE>
<S>                                                  <C>
Management Fees                                       0.67%
Distribution (12b-1) Fees                             0.00
Other Expenses                                        0.11
                                                     -----
Total Annual Fund Operating Expenses                  0.78%
                                                     =====
Fee Waiver and/or Expense Reimbursement               0.03%(2)
NET EXPENSES                                          0.75%
</TABLE>

(1)  The expense table and the Example below reflect the expenses of both the
     Fund and its corresponding Portfolio.

(2)  The Manager has contractually agreed to reimburse the Fund for Other
     Expenses through October 31, 2000 to the extent that Total Annual Fund
     Operating Expenses exceed 0.75%.

<TABLE>
<S> <C>                                              <C>
Example
- --------------------------------------------------------
This Example is intended to help you compare the cost of
investing in the Fund with the cost of investing in
other mutual funds. The Example assumes that you invest
$10,000 in the Fund for the time periods indicated and
then redeem all of your shares at the end of those
periods. The Example also assumes that your investment
has a 5% return each year and that the Fund's operating
expenses remain the same. Because the Manager's expense
reimbursement is only guaranteed through October 31,
2000, net expenses are used to calculate costs in year
one, and total fund expenses are used to calculate costs
in years two through ten. Although your actual costs may
be higher or lower, based on these assumptions your
costs would be:
1 YEAR ..............................................$77
3 YEARS.............................................$246
5 YEARS.............................................$430
10 YEARS............................................$963
</TABLE>

Investment Advisers
- ------------------------------

The Manager allocates the assets of the Fund among the following investment
advisers:

Brandywine Asset Management, Inc.

Hotchkis and Wiley

- --------------------------------------------------------------------------------

Prospectus                              9                        About the Funds
<PAGE>   92

AMERICAN AADVANTAGE

INTERNATIONAL EQUITY FUND(SM)
- --------------------------------------------------------------------------------

Investment Objective
- -------------------------------

Long-term capital appreciation.

Principal Strategies
- ------------------------------

Under normal circumstances, at least 80% of the Fund's total assets are invested
in common stocks and securities convertible into common stocks (collectively,
"stocks") of issuers based in at least three different countries located outside
the United States.

The current countries in which the Fund may invest are:

<TABLE>
<S>        <C>        <C>          <C>
Australia  France     Mexico       South Korea
Austria    Germany    Netherlands  Spain
Belgium    Hong Kong  New Zealand  Sweden
Canada     Ireland    Norway       Switzerland
Denmark    Italy      Portugal     United Kingdom
Finland    Japan      Singapore
</TABLE>

The investment advisers select stocks which, in their opinion, have most or all
of the following characteristics:

- - above-average earnings growth potential,
- - below-average price to earnings ratio,
- - below-average price to book value ratio, and
- - above-average dividend yields.

The investment advisers may also consider potential changes in currency exchange
rates when choosing stocks. Each of the investment advisers determines the
earnings growth prospects of companies based upon a combination of internal and
external research using fundamental analysis and considering changing economic
trends. The decision to sell a stock is typically based on the belief that the
company is no longer considered undervalued or shows deteriorating fundamentals,
or that better investment opportunities exist in other stocks. The Manager
believes that this strategy will help the Fund outperform other investment
styles over the longer term while minimizing volatility and downside risk. The
Fund may trade forward foreign currency contracts or currency futures to hedge
currency fluctuations of underlying stock positions when it is believed that a
foreign currency may suffer a decline against the U.S. dollar.

One of the investment advisers utilizes an "amplified alpha" approach in
determining which equity securities to buy and sell. This approach attempts to
amplify the outperformance expected from the best ideas of the other investment
advisers by concentrating assets in those stocks that are overweighted in the
aggregate of the advisers' portfolios when compared to a relevant market index.

Under adverse market conditions, the Fund may, for temporary defensive purposes,
invest up to 100% of its assets in cash or cash equivalents, including
investment grade short-term obligations. To the extent that the Fund invokes
this strategy, its ability to achieve its investment objective may be affected
adversely.

Risk Factors
- -------------------

MARKET RISK
Since this Fund invests most of its assets in stocks, it is subject to stock
market risk. Market risk involves the possibility that the value of the Fund's
investments in stocks of a particular country will decline due to drops in that
country's stock market. In general, the value of the Fund will move in the same
direction as the international stock market it invests in, which will vary from
day to day in response to the activities of individual companies and general
market and economic conditions of that country.

FOREIGN INVESTING
Overseas investing carries potential risks not associated with domestic
investments. Such risks include, but are not limited to: (1) currency exchange
rate fluctuations, (2) political and financial instability, (3) less liquidity
and greater volatility of foreign investments, (4) lack of uniform accounting,
auditing and financial reporting standards, (5) less government regulation and
supervision of foreign stock exchanges, brokers and listed companies, (6)
increased price volatility, (7) delays in transaction settlement in some foreign
markets, and (8) adverse impact of the euro conversion on the business or
financial condition of companies in which the Fund is invested.

ADDITIONAL RISKS
An investment in the Fund is not a deposit of a bank and is not insured or
guaranteed by the Federal Deposit Insurance Corporation or any other government
agency. The value of an investment in the Fund will fluctuate up and down. When
you sell your shares of the Fund, they could be worth less than what you paid
for them.

- --------------------------------------------------------------------------------

About the Funds                        10                             Prospectus
<PAGE>   93
AMERICAN AADVANTAGE
INTERNATIONAL EQUITY FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

Historical Performance
- -----------------------------------

The bar chart and table below provide an indication of risk by showing how the
Fund's performance has varied from year to year. The table shows how the Fund's
performance compares to the Morgan Stanley Europe Australasia Far East ("EAFE")
Index, a widely recognized unmanaged index of international stock investment
performance, and the Lipper International Index, a composite of mutual funds
with the same investment objective as the Fund. The AMR Class of the Fund began
offering its shares on August 1, 1994. However, another class of shares of the
Fund not offered in this prospectus has been offered since August 7, 1991. In
the chart and table below, performance results before August 1, 1994 are for the
older class. Because the other class had slightly higher expenses, its
performance was slightly lower than the Fund would have realized in the same
period. Past performance is not necessarily indicative of how the Fund will
perform in the future.

                                    [GRAPH]

TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>
92..........................................................  -11.03%
93..........................................................   42.33%
94..........................................................    1.09%
95..........................................................   18.01%
96..........................................................   20.06%
97..........................................................    9.88%
98..........................................................   12.07%
99..........................................................   27.21%
</TABLE>

<TABLE>
<S>                             <C>
Highest Quarterly Return:             15.30%
  (1/1/92 through 12/31/99)     (4th Quarter 1998)
Lowest Quarterly Return:             -15.54%
  (1/1/92 through 12/31/99)     (3rd Quarter 1998)
</TABLE>

<TABLE>
<CAPTION>
                           AVERAGE ANNUAL TOTAL RETURN
                        ----------------------------------
                                  AS OF 12/31/99
                        ----------------------------------
                                           SINCE INCEPTION
                        1 YEAR   5 YEARS      (8/7/91)
                        ------   -------   ---------------
<S>                     <C>      <C>       <C>
INTERNATIONAL EQUITY
  FUND                  27.21%   17.29%        13.54%
EAFE Index              26.96%   12.83%        11.01%
Lipper International
  Index                 37.83%   15.96%        13.37%
</TABLE>

Fees and Expenses
- ----------------------------

This table describes the fees and expenses that you pay if you buy and hold
shares of the International Equity Fund.(1)

Annual Fund Operating Expenses (expenses that are deducted from Fund assets)

<TABLE>
<S>                                                      <C>
Management Fees                                          0.36%
Distribution (12b-1) Fees                                0.00
Other Expenses                                           0.13
                                                         ----
TOTAL ANNUAL FUND OPERATING EXPENSES                     0.49%
                                                         ====
</TABLE>

(1)   The expense table and the Example below reflect the expenses of both the
      Fund and its corresponding Portfolio.

<TABLE>
<S> <C>                                          <C>
Example
- ----------------------------------------------------
This Example is intended to help you compare the
cost of investing in the Fund with the cost of
investing in other mutual funds. The Example assumes
that you invest $10,000 in the Fund for the time
periods indicated and then redeem all of your shares
at the end of those periods. The Example also as-
sumes that your investment has a 5% return each year
and that the Fund's operating expenses remain the
same. Although your actual costs may be higher or
lower, based on these assumptions your costs would
be:
1 YEAR ..........................................$50
3 YEARS.........................................$157
5 YEARS.........................................$274
10 YEARS........................................$616
</TABLE>

Investment Advisers
- ------------------------------

The Manager allocates the assets of the Fund among the following investment
advisers:

Hotchkis and Wiley

Independence Investment Associates, Inc.

Lazard Asset Management

Templeton Investment Counsel, Inc.

- --------------------------------------------------------------------------------

Prospectus                             11                        About the Funds
<PAGE>   94

AMERICAN AADVANTAGE

S&P 500 INDEX FUND (1) -- INSTITUTIONAL CLASS
- --------------------------------------------------------------------------------

Investment Objective
- -------------------------------

To replicate as closely as possible, before expenses, the performance of the
Standard & Poor's 500 Composite Stock Price Index ("S&P 500 Index" or "Index").

Principal Strategies
- ------------------------------

The Fund uses a passive management strategy designed to track the performance of
the S&P 500 Index. The S&P Index is a well-known stock market index that
includes common stocks of 500 companies from several industrial sectors
representing a significant portion of the market value of all stocks publicly
traded in the United States.

The Fund is not managed according to traditional methods of "active" investment
management, which involve the buying and selling of securities based upon
economic, financial and market analysis and investment judgement. Instead, the
Fund, using a "passive" or "indexing" investment approach, attempts to
replicate, before expenses, the performance of the S&P 500 Index. State Street,
through its State Street Global Advisors division, seeks a correlation of 0.95
or better between the Fund's performance and the performance of the Index; a
figure of 1.00 would represent perfect correlation.

The Fund intends to invest in all 500 stocks comprising the Index in proportion
to their weightings in the Index. However, under various circumstances, it may
not be possible or practicable to purchase all 500 stocks in those weightings.
In those circumstances, the Fund may purchase a sample of the stocks in the
Index in proportions expected by State Street to replicate generally the
performance of the Index as a whole. In addition, from time to time stocks are
added to or removed from the Index. The Fund may sell stocks that are
represented in the Index, or purchase stocks that are not yet represented in the
Index, in anticipation of their removal from or addition to the Index.

In addition, the Fund may at times purchase or sell futures contracts on the
Index, or options on those futures, in lieu of investment directly in the stocks
making up the Index. The Fund might do so, for example, in order to increase its
investment exposure pending investment of cash in the stocks comprising the
Index. Alternatively, the Fund might use futures or options on futures to reduce
its investment exposure in situations where it intends to sell a portion of the
stocks in its portfolio but the sale has not yet been completed. The Fund may
also enter into other derivatives transactions, including the purchase or sale
of options or enter into swap transactions, to assist in replicating the
performance of the Index.

Risk Factors
- -------------------

MARKET RISK
Stock values could decline generally or could underperform other investments. In
addition, returns on investments in stocks of large U.S. companies could trail
the returns on investments in stocks of smaller companies.

TRACKING ERROR RISK
The Fund's return may not match the return of the Index for a number of reasons.
For example, the Fund incurs a number of operating expenses not applicable to
the Index, and incurs costs in buying and selling securities. The Fund may not
be fully invested at times, either as a result of cash flows into the Fund or
reserves of cash held by the Fund to meet redemptions. The return on the sample
of stocks purchased by the Fund, or futures or other derivative positions taken
by the Fund, to replicate the performance of the Index may not correlate
precisely with the return on the Index.

DERIVATIVES
The use of these instruments to pursue the S&P 500 Index returns requires
special skills, knowledge and investment techniques that differ from those
required for normal portfolio management. Gains or losses from positions in a
derivative instrument may be much greater than the derivative's original cost.

ADDITIONAL RISKS
An investment in the Fund is not a deposit with a bank and is not insured or
guaranteed by the Federal Deposit Insurance Corporation or any other government
agency. The value of an investment in the Fund

- ---------------

(1)  S&P is a trademark of The McGraw-Hill Companies, Inc. and has been licensed
     for use. "Standard and Poor's(R)," "S&P(R)," "Standard & Poor's 500," "S&P
     500(R)" and "500" are all trademarks of The McGraw-Hill Companies, Inc. and
     have been licensed for use by State Street Bank and Trust Company. The S&P
     500 Index Fund is not sponsored, sold or promoted by Standard & Poor's, and
     Standard & Poor's makes no representation regarding the advisability of
     investing in this Fund.

- --------------------------------------------------------------------------------

About the Funds                        12                             Prospectus
<PAGE>   95
AMERICAN AADVANTAGE
S&P 500 INDEX FUND -- INSTITUTIONAL CLASS -- (CONTINUED)
- --------------------------------------------------------------------------------

will fluctuate up and down. When you sell your shares of the Fund, they could be
worth less than what you paid for them.

Historical Performance
- -----------------------------------

The bar chart and table below provide an indication of risk by showing how the
Fund's performance has varied from year to year. The table shows how the Fund's
performance compares to the S&P 500 Index, a widely recognized unmanaged index
of common stocks publicly traded in the United States, and the Lipper S&P 500
Index, a composite of funds with the same investment objective as the Fund. The
Fund began offering its shares on January 1, 1997. Prior to March 1, 1998, the
Fund's shares were offered as AMR Class shares. On March 1, 1998, AMR Class
shares of the Fund were designated Institutional Class shares. Prior to March 1,
2000, the Fund invested all of its investable assets in the BT Equity 500 Index
Portfolio, a separate investment company managed by Bankers Trust Company. Past
performance is not necessarily indicative of how the Fund will perform in the
future.

                                    [GRAPH]

TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>
97..........................................................  33.09%
98..........................................................  28.87%
99..........................................................  20.70%
</TABLE>

<TABLE>
<S>                            <C>
Highest Quarterly Return:            21.32%
  (1/1/97 through 12/31/99)    (4th Quarter 1998)
Lowest Quarterly Return:             -9.69%
  (1/1/97 through 12/31/99)    (3rd Quarter 1998)
</TABLE>

<TABLE>
<CAPTION>
                                         AVERAGE ANNUAL
                                          TOTAL RETURN
                                    ------------------------
                                         AS OF 12/31/99
                                    ------------------------
                                             SINCE INCEPTION
                                    1 YEAR     (12/31/96)
                                    ------   ---------------
<S>                                 <C>      <C>
S&P 500 INDEX FUND                  20.70%        27.45%
S&P 500 Index                       20.99%        27.56%
Lipper S&P 500 Index                20.62%        27.24%
</TABLE>

Fees and Expenses
- ----------------------------

This table describes the fees and expenses that you may pay if you buy and hold
shares of the S&P 500 Index Fund.(1)

Annual Fund Operating Expenses
(expenses that are deducted from Fund assets)

<TABLE>
<S>                                                   <C>
Management Fees                                       0.045%(2)
Distribution (12b-1) Fees                             0.00
Other Expenses                                        0.105
                                                      ----
TOTAL ANNUAL FUND OPERATING EXPENSES                  0.15%
                                                      ====
</TABLE>

(1)   The expense table and the Example below reflect the expenses of both the
      Fund and the State Street Equity 500 Index Portfolio.

(2)  Management Fees reflects current fees.

<TABLE>
<S> <C>                                          <C>
Example
- ----------------------------------------------------
This Example is intended to help you compare the
cost of investing in the Fund with the cost of
investing in other mutual funds. The Example assumes
that you invest $10,000 in the Fund for the time
periods indicated and then redeem all of your shares
at the end of those periods. The Example also as-
sumes that your investment has a 5% return each year
and that the Fund's operating expenses remain the
same. Although your actual costs may be higher or
lower, based on these assumptions your costs would
be:
1 YEAR ..........................................$15
3 YEARS..........................................$48
5 YEARS..........................................$85
10 YEARS........................................$192
</TABLE>

Investment Adviser
- -----------------------------

State Street Bank and Trust Company

- --------------------------------------------------------------------------------

Prospectus                             13                        About the Funds
<PAGE>   96

AMERICAN AADVANTAGE

INTERMEDIATE BOND FUND(SM)
- --------------------------------------------------------------------------------

Investment Objective
- -------------------------------

Income and capital appreciation.

Principal Strategies
- ------------------------------

The Fund invests in obligations of the U.S. Government, its agencies and
instrumentalities; corporate debt securities, such as commercial paper, master
demand notes, loan participation interests, medium-term notes and funding
agreements; mortgage-backed securities; asset-backed securities; and
Yankeedollar and Eurodollar bank certificates of deposit, time deposits,
bankers' acceptances and other notes. As an investment policy, the Fund
primarily seeks income and secondarily seeks capital appreciation. The Fund
seeks capital appreciation by investing in corporate issues whose relative value
is expected to increase over time.

The Fund will only buy debt securities that are investment grade at the time of
purchase. Investment grade securities include securities issued or guaranteed by
the U.S. Government, its agencies and instrumentalities, as well as securities
rated in one of the four highest rating categories by all rating organizations
rating the securities (such as Standard & Poor's Corporation or Moody's
Investors Service, Inc.). No more than 25% of total assets may be invested in
securities rated in the fourth highest rating category. The Fund, at the
discretion of the applicable investment adviser, may retain a security that has
been downgraded below the initial investment criteria.

In determining which securities to buy and sell, the Manager employs a top-down
fixed income investment strategy, as follows:

- - Develop an overall investment strategy, including a portfolio duration target,
  by examining the current trend in the U.S. economy.
- - Set desired portfolio maturity structure by comparing the differences between
  corporate and U.S. Government securities of similar duration to judge their
  potential for optimal return in accordance with the target duration benchmark.
- - Determine the weightings of each security type by analyzing the difference in
  yield spreads between corporate and U.S. Government securities.
- - Select specific debt securities within each security type.
- - Review and monitor portfolio composition for changes in credit, risk-return
  profile and comparisons with benchmarks.

The other investment adviser to the Fund uses a bottom-up fixed income
investment strategy in determining which securities to buy and sell, as follows:

- - Search for eligible securities with a yield to maturity advantage versus a
  U.S. Government security with a similar maturity.
- - Evaluate credit quality of the securities.
- - Perform an analysis of the expected price volatility of the securities to
  changes in interest rates by examining actual price volatility between U.S.
  Government and non-U.S. Government securities.

Under normal circumstances, the Fund seeks to maintain a duration of three to
seven years. Duration is a measure of price sensitivity relative to changes in
interest rates. Portfolios with longer durations are typically more sensitive to
changes in interest rates. Under adverse market conditions, the Fund may, for
temporary defensive purposes, invest up to 100% of its assets in cash or cash
equivalents, including investment grade short-term debt obligations. To the
extent that the Fund invokes this strategy, its ability to achieve its
investment objective may be affected adversely.

Risk Factors
- -------------------

INTEREST RATE RISK
The Fund is subject to the risk that the market value of the bonds it holds will
decline due to rising interest rates. When interest rates rise, the prices of
most bonds go down. When interest rates go down, bond prices generally go up.
The price of a bond is also affected by its maturity. Bonds with longer
maturities generally have greater sensitivity to changes in interest rates.

CREDIT RISK
The Fund is subject to the risk that the issuer of a bond will fail to make
timely payment of interest or principal. A decline in an issuer's credit rating
can cause its price to go down. This risk is somewhat minimized by the Fund's
policy of only investing in bonds that are considered investment grade at the
time of purchase.

PREPAYMENT RISK
The Fund's investments in asset-backed and mortgage-backed securities are
subject to the risk that the principal amount of the underlying collateral may
be repaid prior to the bond's maturity date. If this occurs, no additional
interest will be paid on the investment and the Fund may have to invest at a
lower rate.

- --------------------------------------------------------------------------------

About the Funds                        14                             Prospectus
<PAGE>   97
AMERICAN AADVANTAGE
INTERMEDIATE BOND FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

ADDITIONAL RISKS
An investment in the Fund is not a deposit of a bank and is not insured or
guaranteed by the Federal Deposit Insurance Corporation or any other government
agency. The value of an investment in the Fund will fluctuate up and down. When
you sell your shares of the Fund, they could be worth less than what you paid
for them.

Historical Performance
- -----------------------------------

The bar chart and table below provide an indication of risk by showing how the
Fund has performed during the past two years. The table shows how the Fund's
performance compares to the Lehman Brothers Intermediate Gov./Corp. and
Aggregate Indexes, two broad-based market indices, and the Lipper Intermediate
Investment Grade Debt Average and Index, composites of mutual funds with the
same investment objective as the Fund. The AMR Class of the Fund began offering
its shares on March 1, 1999. However, another class of shares of the Fund not
offered in this prospectus has been offered since September 15, 1997. In the
chart and table below, performance results before March 1, 1999 are for the
other class. Because the other class had slightly higher expenses, its
performance was slightly lower than the Fund would have realized in the same
period. Past performance is not necessarily indicative of how the Fund will
perform in the future.

                                    [GRAPH]

          TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>
98..........................................................   8.57%
99..........................................................  -2.34%
</TABLE>

<TABLE>
<S>                               <C>
Highest Quarterly Return:               4.62%
  (1/1/98 through 12/31/98)       (3rd Quarter 1998)
Lowest Quarterly Return:                -1.64%
  (1/1/98 through 12/31/99)       (1st Quarter 1999)
</TABLE>

<TABLE>
<CAPTION>
                                        AVERAGE ANNUAL
                                         TOTAL RETURN
                                   ------------------------
                                        AS OF 12/31/99
                                   ------------------------
                                            SINCE INCEPTION
                                   1 YEAR      (9/15/97)
                                   ------   ---------------
<S>                                <C>      <C>
INTERMEDIATE BOND FUND             -2.34%        4.47%
Lehman Bros. Aggregate Index(2)    -0.83%     5.21%(1)
Lehman Bros. Intermediate Gov./     0.39%     5.16%(1)
  Corp. Index(3)
Lipper Intermediate Investment     -1.00%     4.40%(1)
  Grade Debt Index(4)
Lipper Intermediate Investment     -1.31%     4.16%(1)
  Grade Debt Average
</TABLE>

(1)  The Since Inception return is shown from 8/31/97.

(2)  The Lehman Brothers Aggregate Index is a market value weighted performance
     benchmark for government, corporate, mortgage-backed and asset-backed
     fixed-rate debt securities of all maturities. As of March 1, 2000, this
     Index has replaced the Lehman Bros. Intermediate Gov./Corp. Index as the
     Fund's market index, because it better reflects the principal strategies of
     the Fund.

(3)  The Lehman Brothers Intermediate Gov./Corp. Index is a market value
     weighted performance benchmark for government and corporate fixed-rate debt
     securities with maturities between one and ten years.

(4)  As of March 1, 2000, the Fund's investment advisers have designated this
     Index of 30 funds as the Fund's performance benchmark, replacing the Lipper
     Intermediate Investment Grade Debt Average.

Fees and Expenses
- ----------------------------

This table describes the fees and expenses that you may pay if you buy and hold
shares of the Intermediate Bond Fund.(1)

Annual Fund Operating Expenses
(expenses that are deducted from Fund assets)

<TABLE>
<S>                                                    <C>
Management Fees                                        0.25%
Distribution (12b-1) Fees                              0.00
Other Expenses                                         0.05
                                                       ----
TOTAL ANNUAL FUND OPERATING EXPENSES                   0.30%
                                                       ====
</TABLE>

(1)   The expense table and the Example below reflect the expenses of both the
      Fund and its corresponding Portfolio.

- --------------------------------------------------------------------------------

Prospectus                             15                        About the Funds
<PAGE>   98
AMERICAN AADVANTAGE
INTERMEDIATE BOND FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

<TABLE>
<S> <C>                                            <C>
Example
- ------------------------------------------------------
This example is intended to help you compare the cost
of investing in the Fund with the cost of investing in
other mutual funds. The example assumes that you
invest $10,000 in the Fund for the time periods
indicated and then redeem all of your shares at the
end of those periods. The Example also assumes that
your investment has a 5% return each year and that the
Fund's operating expenses remain the same. Although
your actual costs may be higher or lower, based on
these assumptions your costs would be:
1 YEAR ............................................$31
3 YEARS............................................$97
5 YEARS...........................................$169
10 YEARS..........................................$381
</TABLE>

Investment Advisers
- ------------------------------

The Manager allocates the assets of the Fund among the following investment
advisers:

AMR Investment Services, Inc.

Barrow, Hanley, Mewhinney & Strauss, Inc.

- --------------------------------------------------------------------------------

About the Funds                        16                             Prospectus
<PAGE>   99

AMERICAN AADVANTAGE

SHORT-TERM BOND FUND(SM)
- --------------------------------------------------------------------------------

Investment Objective
- -------------------------------

Income and capital appreciation.

Principal Strategies
- ------------------------------

The Fund invests in obligations of the U.S. Government, its agencies and
instrumentalities; corporate debt securities, such as commercial paper, master
demand notes, loan participation interests, medium-term notes and funding
agreements; mortgage-backed securities; asset-backed securities; and
Yankeedollar and Eurodollar bank certificates of deposit, time deposits,
bankers' acceptances and other notes. As an investment policy, the Fund
primarily seeks income and secondarily seeks capital appreciation. The Fund
seeks capital appreciation by investing in corporate issues whose relative value
is expected to increase over time.

The Fund will only buy debt securities that are investment grade at the time of
purchase. Investment grade securities include securities issued or guaranteed by
the U.S. Government, its agencies and instrumentalities, as well as securities
rated in one of the four highest rating categories by all rating organizations
rating the securities (such as Standard & Poor's Corporation or Moody's
Investors Service, Inc.). No more than 25% of total assets may be invested in
securities rated in the fourth highest rating category. The Fund, at the
discretion of the investment advisers, may retain a security that has been
downgraded below the initial investment criteria.

In determining which securities to buy and sell, the Manager employs a top-down
fixed income investment strategy, as follows:

- - Develop an overall investment strategy, including a portfolio duration target,
  by examining the current trend in the U.S. economy.
- - Set desired portfolio maturity structure by comparing the differences between
  corporate and U.S. Government securities of similar duration to judge their
  potential for optimal return in accordance with the target duration benchmark.
- - Determine the weightings of each security type by analyzing the difference in
  yield spreads between corporate and U.S. Government securities.
- - Select specific debt securities within each security type.
- - Review and monitor portfolio composition for changes in credit, risk-return
  profile and comparisons with benchmarks.

Under normal circumstances, the Fund seeks to maintain a duration of one to
three years. Duration is a measure of price sensitivity relative to changes in
interest rates. Portfolios with longer durations are typically more sensitive to
changes in interest rates. Under adverse market conditions, the Fund may, for
temporary defensive purposes, invest up to 100% of its assets in cash or cash
equivalents, including investment grade short-term debt obligations. To the
extent that the Fund invokes this strategy, its ability to achieve its
investment objective may be affected adversely.

Risk Factors
- -------------------

INTEREST RATE RISK
The Fund is subject to the risk that the market value of the bonds it holds will
decline due to rising interest rates. When interest rates rise, the prices of
most bonds go down. When interest rates go down, bond prices generally go up.
The price of a bond is also affected by its maturity. Bonds with longer
maturities generally have greater sensitivity to changes in interest rates.

CREDIT RISK
The Fund is subject to the risk that the issuer of a bond will fail to make
timely payment of interest or principal. A decline in an issuer's credit rating
can cause its price to go down. This risk is somewhat minimized by the Fund's
policy of only investing in bonds that are considered investment grade at the
time of purchase.

PREPAYMENT RISK
The Fund's investments in mortgage-backed securities are subject to the risk
that the principal amount of the underlying mortgage may be repaid prior to the
bond's maturity date. If this occurs, no additional interest will be paid on the
investment and the Fund may have to invest at a lower rate.

ADDITIONAL RISKS
An investment in the Fund is not a deposit of a bank and is not insured or
guaranteed by the Federal Deposit Insurance Corporation or any other government
agency. The value of an investment in the Fund will fluctuate up and down. When
you sell your shares of the Fund, they could be worth less than what you paid
for them.

- --------------------------------------------------------------------------------
Prospectus                             17                        About the Funds
<PAGE>   100
AMERICAN AADVANTAGE
SHORT-TERM BOND FUND(SM) -- (CONTINUED)
- --------------------------------------------------------------------------------

Historical Performance
- -----------------------------------

The bar chart and table below provide an indication of risk by showing how the
Fund's performance has varied from year to year. The table shows how the Fund's
performance compares to the Lehman Brothers Intermediate Gov./Corp. and Merrill
Lynch 1-3 Year Gov./Corp. Indexes, two broad-based market indices, and the
Linked Lipper Investment Grade Debt Averages, a composite of mutual funds with
the same investment objective as the Fund. The AMR Class of the Fund began
offering its shares on August 1, 1994. However, another class of shares of the
Fund not offered in this prospectus has been offered since December 3, 1987. In
the chart and table below, performance results before August 1, 1994 are for the
older class. Because the other class had slightly higher expenses, its
performance was slightly lower than the AMR Class of the Fund would have
realized in the same period. Past performance is not necessarily indicative of
how the Fund will perform in the future.

                                    [GRAPH]

          TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>
90..........................................................    8.47%
91..........................................................   12.97%
92..........................................................    5.19%
93..........................................................    6.50%
94..........................................................    1.15%
95..........................................................   10.18%
96..........................................................    4.04%
97..........................................................    7.00%
98..........................................................    5.63%
99..........................................................    3.07%
</TABLE>

<TABLE>
<S>                               <C>
Highest Quarterly Return:               4.66%
  (1/1/90 through 12/31/99)       (4th Quarter 1991)
Lowest Quarterly Return:                -0.53%
  (1/1/90 through 12/31/99)       (1st Quarter 1992)
</TABLE>

<TABLE>
<CAPTION>
                                   AVERAGE ANNUAL TOTAL
                                          RETURN
                                ---------------------------
                                      AS OF 12/31/99
                                ---------------------------
                                1 YEAR   5 YEARS   10 YEARS
                                ------   -------   --------
<S>                             <C>      <C>       <C>
SHORT-TERM BOND FUND            3.07%     5.95%     6.37%
Merrill Lynch 1-3 Yr Gov./
  Corp. Index(1)                3.25%     6.59%     6.68%
Lehman Bros. Intermediate
  Gov./Corp. Index(2)           0.39%     7.09%     7.26%
Linked Lipper Investment Grade
  Debt Averages(3)              2.79%     5.74%     6.00%
</TABLE>

 (1)   The Merrill Lynch 1-3 Yr. Gov./Corp. Index is a market value weighted
       performance benchmark for government and corporate fixed-rate debt
       securities with maturities between one and three years. As of March 1,
       2000, the Manager replaced the Lehman Bros. Intermediate Gov./Corp. Index
       with this Index, because it better reflects the duration of the Fund.

(2)   The Lehman Bros. Intermediate Gov./Corp. Index is a market value weighted
      performance benchmark for government and corporate fixed-rate debt
      securities with maturities between one and ten years.

(3)  The Linked Lipper Investment Grade Debt Averages includes the Lipper
     Short-Term Investment Grade Debt Average prior to 1/1/96, the Lipper
     Short-Intermediate Investment Grade Debt Average from 1/1/96 through
     7/31/96 and the Lipper Short-Term Investment Grade Debt Average since
     8/1/96.

<TABLE>
<S> <C>                                          <C>
Fees and Expenses
- ----------------------------------------------------
</TABLE>

This table describes the fees and expenses that you may pay if you buy and hold
shares of the Short-Term Bond Fund.(1)

Annual Fund Operating Expenses
(expenses that are deducted from Fund assets)

<TABLE>
<S>                                                      <C>
Management Fees                                          0.25%
Distribution (12b-1) Fees                                0.00
Other Expenses                                           0.10
                                                         ----
TOTAL ANNUAL FUND OPERATING EXPENSES                     0.35%
                                                         ====
</TABLE>

(1)   The expense table and the Example below reflect the expenses of both the
      Fund and its corresponding Portfolio.

<TABLE>
<S> <C>                                          <C>
Example
- ----------------------------------------------------
This Example is intended to help you compare the
cost of investing in the Fund with the cost of
investing in other mutual funds. The Example assumes
that you invest $10,000 in the Fund for the time
periods indicated and then redeem all of your shares
at the end of those periods. The Example also as-
sumes that your investment has a 5% return each year
and that the Fund's operating expenses remain the
same. Although your actual costs may be higher or
lower, based on these assumptions your costs would
be:
1 YEAR ..........................................$36
3 YEARS.........................................$113
5 YEARS.........................................$197
10 YEARS........................................$443
</TABLE>

Investment Adviser
- -----------------------------

AMR Investment Services, Inc.

- --------------------------------------------------------------------------------

About the Funds                        18                             Prospectus
<PAGE>   101

The Manager
- ---------------------
The Trust has retained AMR Investment Services, Inc. to serve as its Manager.
The Manager, located at 4333 Amon Carter Boulevard, Fort Worth, Texas 76155, is
a wholly owned subsidiary of AMR Corporation, the parent company of American
Airlines, Inc. The Manager was organized in 1986 to provide investment
management, advisory, administrative and asset management consulting services.
As of December 31, 1999, the Manager had approximately $21.7 billion of assets
under management, including approximately $8.4 billion under active management
and $13.3 billion as named fiduciary or financial adviser. Of the total,
approximately $15.3 billion of assets are related to AMR Corporation.

The Manager provides or oversees the provision of all administrative, investment
advisory and portfolio management services to the Funds. The Manager

- - develops the investment programs for each Fund,
- - selects and changes investment advisers (subject to requisite approvals),
- - allocates assets among investment advisers,
- - monitors the investment advisers' investment programs and results,
- - coordinates the investment activities of the investment advisers to ensure
  compliance with regulatory restrictions,
- - oversees each Fund's securities lending activities and actions taken by the
  securities lending agent, and
- - with the exception of the International Equity and S&P 500 Index Funds,
  invests the portion of Fund assets that the investment advisers determine
  should be allocated to high quality short-term debt obligations.

As compensation for providing management services, the Manager receives an
annualized advisory fee that is calculated and accrued daily, equal to the sum
of:

- - 0.25% of the net assets of the Manager's portion of the Intermediate Bond
  Fund,
- - 0.25% of the net assets of the Short-Term Bond Fund, plus
- - 0.10% of the net assets of all other Funds.

In addition, the Balanced, Large Cap Value, Small Cap Value, International
Equity and Intermediate Bond Funds pay the Manager the amounts due to their
respective investment advisers. The Manager then remits these amounts to the
investment advisers.

The Manager also may receive up to 25% of the net annual interest income or up
to 25% of loan fees in regards to securities lending activities. Currently, the
Manager receives 10% of the net annual interest income from the investment of
cash collateral or 10% of the loan fees posted by borrowers. The Securities and
Exchange Commission ("SEC") has granted exemptive relief that permits the Funds
to invest cash collateral received from securities lending transactions in
shares of one or more private or registered investment companies managed by the
Manager.

The management fees paid for the Funds for the fiscal year ended October 31,
1999, net of reimbursements and shown as a percentage of average net assets,
were as follows:

<TABLE>
<CAPTION>
FUND                             MANAGEMENT FEES
- ----                             ----------------
<S>                              <C>
Balanced.......................       0.30%
Large Cap Value................       0.30%
Small Cap Value................       0.67%
Intermediate Bond..............       0.25%
International Equity...........       0.36%
S&P 500 Index..................       0.08%
Short-Term Bond................       0.25%
</TABLE>

William F. Quinn and Nancy A. Eckl have primary responsibility for the
day-to-day operations of the Balanced, Large Cap Value, Small Cap Value,
International Equity and Intermediate Bond Funds, except as indicated otherwise
below. These responsibilities include oversight of the investment advisers,
regular review of each investment adviser's performance and asset allocations
among multiple investment advisers. Mr. Quinn has served as President of the
Manager since its inception in 1986. Ms. Eckl has served as Vice President-Trust
Investments of the Manager since May 1995. Prior to her current position, Ms.
Eckl held the position of Vice President-Finance and Compliance of the Manager
from December 1990 through April 1995.

Michael W. Fields oversees the team responsible for the portfolio management of
the Short-Term Bond Fund. Mr. Fields has been with the Manager since it was
founded in 1986 and serves as Vice President-Fixed Income Investments.

Equity 500 Index Portfolio Administrator
- ------------------------------------------------------------

State Street serves as the adviser, administrator, custodian and transfer agent
to the Equity 500 Index Portfolio. As compensation for its services as adviser,
administrator, custodian and transfer agent (and for assuming ordinary operating
expenses for the Portfolio, including ordinary legal and audit expenses), State
Street receives an advisory fee at an annual rate of 0.045% of the average daily
net assets of the Portfolio.

The Investment Advisers
- ----------------------------------------

Set forth below is a brief description of the investment advisers for each Fund.
The Manager is the sole investment adviser of the Short-Term Bond Fund. Except
for this Fund and the S&P 500 Index Fund, each Fund's assets are allocated among
the investment advisers by the Manager. The assets of

- --------------------------------------------------------------------------------
Prospectus                             19                        About the Funds
<PAGE>   102

the Intermediate Bond Fund are allocated by the Manager between the Manager and
another investment adviser. Each investment adviser has discretion to purchase
and sell securities for its segment of a Fund's assets in accordance with the
Fund's objectives, policies, restrictions and more specific strategies provided
by the Manager. Pursuant to an exemptive order issued by the SEC, the Manager is
permitted to enter into new or modified investment advisory agreements with
existing or new investment advisers without approval of a Fund's shareholders,
but subject to approval of the Trust's Board of Trustees ("Board") and the AMR
Investment Services Trust Board ("AMR Trust Board"). The Prospectus will be
supplemented if additional investment advisers are retained or the contract with
any existing investment adviser is terminated.

BARROW, HANLEY, MEWHINNEY & STRAUSS, INC. ("BARROW"), 3232 McKinney Avenue, 15th
Floor, Dallas, Texas 75204, is a professional investment counseling firm which
has been providing investment advisory services since 1979. The firm is wholly
owned by United Asset Management Corporation, a Delaware corporation. As of
December 31, 1999, Barrow had discretionary investment management authority with
respect to approximately $29.1 billion of assets, including approximately $1.3
billion of assets of AMR and its subsidiaries and affiliated entities. Barrow
serves as an investment adviser to the Balanced, Large Cap Value, Intermediate
Bond and Short-Term Bond Funds, although the Manager does not presently intend
to allocate any of the assets in the Short-Term Bond Fund to Barrow.

BRANDYWINE ASSET MANAGEMENT, INC. ("BRANDYWINE"), 201 North Walnut Street,
Wilmington, Delaware 19801, is a professional investment counseling firm founded
in 1986. Brandywine is a wholly owned subsidiary of Legg Mason, Inc. As of
December 31, 1999, Brandywine had assets under management totaling approximately
$6.6 billion, including approximately $1.1 billion of assets of AMR and its
subsidiaries and affiliated entities. Brandywine serves as an investment adviser
to the Balanced, Large Cap Value and Small Cap Value Funds.

HOTCHKIS AND WILEY, 725 South Figueroa Street, Suite 4000, Los Angeles,
California 90017, is a professional investment management firm which was founded
in 1980. Hotchkis and Wiley is a division of Merrill Lynch Asset Management,
L.P., a wholly owned indirect subsidiary of Merrill Lynch & Co., Inc. Assets
under management as of December 31, 1999 were approximately $12.6 billion, which
included approximately $1.9 billion of assets of AMR and its subsidiaries and
affiliated entities. Hotchkis and Wiley serves as an investment adviser to the
Balanced, Large Cap Value, Small Cap Value and International Equity Funds.

INDEPENDENCE INVESTMENT ASSOCIATES, INC. ("IIA"), 53 State Street, Boston,
Massachusetts 02109, is a professional investment counseling firm which was
founded in 1982. The firm is a wholly owned subsidiary of John Hancock Financial
Services. Assets under management as of December 31, 1999, including funds
managed for its parent company, were approximately $32.5 billion, which included
approximately $1.2 billion of assets of AMR and its subsidiaries and affiliated
entities. IIA serves as an investment adviser to the Balanced, Large Cap Value
and International Equity Funds.

LAZARD ASSET MANAGEMENT, ("LAZARD"), 30 Rockefeller Plaza, New York, New York
10112, is a division of Lazard Freres & Co. LLC, a registered investment adviser
and member of the New York, American and Chicago Stock Exchanges, providing its
clients with a wide variety of investment banking, brokerage and related
services. Lazard provides investment management services to client discretionary
accounts with assets totaling approximately $74.5 billion as of December 31,
1999, including approximately $400 million of assets of AMR and its subsidiaries
and affiliated entities. Lazard serves as an investment adviser to the
International Equity Fund.

STATE STREET BANK AND TRUST COMPANY ("STATE STREET"), Two International Place,
Boston, Massachusetts 02110, is a Massachusetts banking corporation. State
Street serves as investment adviser and administrator to the Equity 500 Index
Portfolio. As of December 31, 1999, State Street Global Advisors, the division
responsible for managing the Portfolio, had assets under management of $672.4
billion.

TEMPLETON INVESTMENT COUNSEL, INC. ("TEMPLETON"), 500 East Broward Blvd., Suite
2100, Fort Lauderdale, Florida 33394-3091, is a professional investment
counseling firm which has been providing investment services since 1979.
Templeton is indirectly owned by Franklin Resources, Inc. As of December 31,
1999, Templeton had discretionary investment management authority with respect
to approximately $24.9 billion of assets, including approximately $842 million
of assets of AMR and its subsidiaries and affiliated entities. Templeton serves
as an investment adviser to the International Equity Fund.

All other assets of American Airlines, Inc. and its affiliates under management
by each respective investment adviser (except assets managed by Barrow under the
HALO Bond Program) are considered when calculating the fees for each investment
adviser other than State Street. Including these assets lowers the investment
advisory fees for each applicable Fund.

Valuation of Shares
- -------------------------------

The price of each Fund's shares is based on its net asset value ("NAV") per
share. Each Fund's NAV is computed by adding total assets, subtracting all of
the Fund's liabilities, and dividing the result by the total number of shares
outstanding. Equity securities

- --------------------------------------------------------------------------------
About the Funds                        20                             Prospectus
<PAGE>   103

are valued based on market value. Debt securities (other than short-term
securities) usually are valued on the basis of prices provided by a pricing
service. In some cases, the price of debt securities is determined using quotes
obtained from brokers. Securities are valued at fair value, as determined in
good faith and pursuant to procedures approved by the Fund's Board of Trustees,
under certain limited circumstances. For example, fair valuation would be used
if market quotations are not readily available or a material event occurs after
the close of the Exchange which may affect the security's value.

The NAV of AMR and Institutional Class shares will be determined based on a pro
rata allocation of the Portfolio's investment income, expenses and total capital
gains and losses. Each Fund's NAV per share is determined as of the close of the
New York Stock Exchange ("Exchange"), generally 4:00 p.m. Eastern Time, on each
day on which it is open for business. The NAV per share of the International
Equity Fund may change on days when shareholders will not be able to purchase or
redeem the Fund's shares.

ABOUT YOUR INVESTMENT
- ------------------------------------------------------------
Purchase and Redemption of Shares
- -------------------------------------------------------
Eligibility
- ---------------

AMR Class shares are offered only to investors in the tax-exempt retirement and
benefit plans of the AMR Corporation and its affiliates.

Purchase Policies
- --------------------------

No sales charges are assessed on the purchase or sale of Fund shares. Shares of
the Funds are offered and purchase orders accepted until 4:00 p.m. Eastern Time
or the close of the Exchange (whichever comes first) on each day on which the
Exchange is open for trading. If a purchase order is received in good order
prior to the deadline, the purchase price will be the NAV per share next
determined on that day. If a purchase order is received in good order after the
deadline, the purchase price will be the NAV of the following day that the Fund
is open for business.

Redemption Policies
- ------------------------------

Shares of any Fund may be redeemed by telephone or mail on any day that the Fund
is open for business. The redemption price will be the NAV next determined after
a redemption order is received in good order. For assistance with completing a
redemption request, please call (800) 492-9063 (for the S&P 500 Index Fund,
please call (800) 658-5811). Proceeds from redemption orders received by 4:00
p.m. Eastern Time or the close of the Exchange (whichever comes first) generally
are transmitted to shareholders on the next day that the Funds are open for
business.

In any event, proceeds from a redemption order for any fund will be transmitted
to a shareholder by no later than seven days after the receipt of a redemption
request in good order.

The Funds reserve the right to suspend redemptions or postpone the date of
payment (i) when the Exchange is closed (other than for customary weekend and
holiday closings); (ii) when trading on the Exchange is restricted; (iii) when
the SEC determines that an emergency exists so that disposal of a Fund's
investments or determination of its NAV is not reasonably practicable; or (iv)
by order of the SEC for protection of the Funds' shareholders.

Although the Funds intend to redeem shares in cash, each Fund reserves the right
to pay the redemption price in whole or in part by a distribution of readily
marketable securities held by the applicable Fund's corresponding Portfolio.

- --------------------------------------------------------------------------------

Prospectus                             21                  About Your Investment
<PAGE>   104

<TABLE>
<CAPTION>
HOW TO PURCHASE SHARES
                To Make an Initial Purchase                                      To Add to an Existing Account
<S>                                                               <C>
By Wire
Call (800) 492-9063 to purchase shares by wire. Send a bank       Call (800) 492-9063 to purchase shares by wire. Send a bank
wire to State Street Bank & Trust Co. with these                  wire to State Street Bank & Trust Co. with these
instructions:                                                     instructions:
- - ABA# 0110-0002-8; AC-0002-888-6                                 - ABA# 0110-0002-8; AC-0002-888-6
- - Attn: American AAdvantage Funds-AMR Class                       - Attn: American AAdvantage Funds-AMR Class
- - the Fund name and number                                        - the Fund name and Fund number
- - shareholder's account number and registration                   - shareholder's account number and registration
By Exchange
Shares of a Fund may be purchased by exchange from another American AAdvantage Fund if the shareholder has owned AMR Class
shares of the other American AAdvantage Fund for at least 15 days. Send a written request to the address above or call (800)
492-9063 to exchange shares.
</TABLE>

<TABLE>
<CAPTION>
HOW TO REDEEM SHARES
Method                                                            Additional Information
<S>                                                               <C>
By Mail
Write a letter of instruction including                           Proceeds will only be mailed to the account address of
- - the Fund name and number                                        record or transmitted by wire to a commercial bank account
- - shareholder account number                                      designated on the account application form.
- - shares or dollar amount to be redeemed
- - authorized signature
Mail to:
State Street Bank & Trust Co.
P.O. Box 1978
Boston, MA 02105-1978
Attn: American AAdvantage Funds
By Telephone
Call (800) 492-9063 to request a redemption.                      Proceeds from redemptions placed by telephone will
                                                                  generally be transmitted by wire only, as instructed on the
                                                                  application form.
By Exchange
Shares of a Fund may be redeemed in exchange for another American AAdvantage Fund if the shareholder has owned AMR Class
shares of the Fund for at least 15 days. Send a written request to the address above or call (800) 492-9063 to exchange
shares.
</TABLE>

- --------------------------------------------------------------------------------

About Your Investment                  22                             Prospectus
<PAGE>   105

General Policies
- ------------------------

The following policies apply to instructions you may provide to the Funds by
telephone:

- - The Funds, their officers, trustees, directors, employees, or agents are not
  responsible for the authenticity of instructions provided by telephone, nor
  for any loss, liability, cost or expense incurred for acting on them.
- - The Funds employ procedures reasonably designed to confirm that instructions
  communicated by telephone are genuine.
- - Due to the volume of calls or other unusual circumstances, telephone
  redemptions may be difficult to implement during certain time periods.

The Funds reserve the right to:

- - reject any order for the purchase of shares and to limit or suspend, without
  prior notice, the offering of shares,
- - modify or terminate the exchange privilege at any time,
- - limit the number of exchanges between Funds an investor may exercise, and
- - seek reimbursement from the shareholder for any related loss incurred if
  payment for the purchase of Fund shares by check does not clear the
  shareholder's bank.

Distributions and Taxes
- ---------------------------------------

The Funds distribute most or all of their net earnings in the form of dividends
from net investment income and distributions of realized net capital gains and
gains from certain foreign currency transactions. Unless the account application
instructs otherwise, distributions will be reinvested in additional Fund shares.
Monthly distributions are paid to shareholders on the first business day of the
following month. Distributions are paid as follows:

<TABLE>
<CAPTION>
                                                  OTHER
                                              DISTRIBUTIONS
FUND                      DIVIDENDS PAID          PAID
- ----                      --------------      -------------
<S>                    <C>                    <C>
Balanced               Annually                  Annually
Large Cap Value        Annually                  Annually
Small Cap Value        Annually                  Annually
International Equity   Annually                  Annually
S&P 500 Index          April, July, October      Annually
                         and December
Intermediate Bond      Monthly                   Annually
Short-Term Bond        Monthly                   Annually
</TABLE>

Usually, dividends received from a Fund are taxable as ordinary income,
regardless of whether dividends are reinvested. Distributions by a Fund of
realized net short-term capital gains and gains from certain foreign currency
transactions are similarly taxed. Distributions by the Funds of realized net
long-term capital gains are taxable to their shareholders as long-term capital
gains regardless of how long an investor has been a shareholder.

Some foreign countries may impose taxes on dividends paid to and gains realized
by the International Equity Fund. The Fund may treat these taxes as a deduction
or, under certain conditions, "flow the tax through" to shareholders. In the
latter event, shareholders may either deduct the taxes or use them to calculate
a credit against their federal income tax.

A portion of the income dividends paid by the Balanced Fund, the Large Cap Value
Fund, the Small Cap Value Fund, and the S&P 500 Index Fund is eligible for the
dividends-received deduction allowed to corporations. The eligible portion may
not exceed the Fund's aggregate dividends received from U.S. corporations.
However, dividends received by a corporate shareholder and deducted by it
pursuant to the dividends-received deduction may be subject indirectly to the
federal alternative minimum tax ("AMT"). The International Equity Fund's
dividends most likely will not qualify for the dividends-received deduction
because none of the dividends received by that Fund are expected to be paid by
U.S. corporations.

The qualified retirement and benefit plans of AMR Corporation and its affiliates
("Plans") pay no federal income tax. Individual participants in the Plans should
consult the Plans' governing documents and their own tax advisers for
information on the tax consequences associated with participating in the Plans.

This is only a summary of some of the important income tax considerations that
may affect Fund shareholders. Shareholders should consult their tax adviser
regarding specific questions as to the effect of federal, state or local income
taxes on an investment in the Funds.

ADDITIONAL INFORMATION
- ------------------------------------------------------------

Distribution of Trust Shares
- ----------------------------------------------

The Trust does not incur any direct distribution expenses related to AMR Class
or Institutional Class shares. However, the Trust has adopted a Distribution
Plan in accordance with Rule 12b-1 under the Investment Company Act of 1940
("1940 Act") which authorizes the use of any fees received by the Manager in
accordance with the Administrative Services and Management Agreements, and any
fees received by the investment advisers pursuant to their Advisory Agreements
with the Manager, to be used for the sale and distribution of Fund shares. In
the event the Trust begins to incur distribution expenses for the Funds,
distribution fees may be paid out of Fund assets, possibly causing the cost of
your investment to increase over time.

- --------------------------------------------------------------------------------
Prospectus                             23                 Additional Information
<PAGE>   106

Master-Feeder Structure
- --------------------------------------

The Funds operate under a master-feeder structure. This means that each Fund is
a "feeder" fund that invests all of its investable assets in a "master" fund
with the same investment objective. The "master" fund purchases securities for
investment. The master-feeder structure works as follows:

                                    [CHART]

Each Fund can withdraw its investment in its corresponding Portfolio at any time
if the Board determines that it is in the best interest of the Fund and its
shareholders to do so. If this happens, the Fund's assets will be invested
according to the investment policies and restrictions described in this
Prospectus.

Financial Highlights
- ---------------------------------

The financial highlights tables are intended to help you understand each Fund's
financial performance for the past five fiscal years (or, if shorter, the period
of the Fund's operations). Certain information reflects financial results for a
single Fund share. The total returns in the table represent the rate that an
investor would have earned (or lost) on an investment in the Fund (assuming
reinvestment of all dividends and distributions). Except for the S&P 500 Index
Fund, each Fund's highlights were audited by Ernst & Young LLP, independent
auditors. The financial highlights of the S&P 500 Index Fund were audited by
PricewaterhouseCoopers LLP, independent auditors. More financial information
about the Funds is found in their Annual Report, which you may obtain upon
request.

- --------------------------------------------------------------------------------
Additional Information                 24                             Prospectus
<PAGE>   107

<TABLE>
<CAPTION>
                                                                               BALANCED FUND-AMR CLASS
                                                              ----------------------------------------------------------
                                                                                YEAR ENDED OCTOBER 31,
                                                              ----------------------------------------------------------
                                                              1999(A)     1998(A)     1997(A)     1996(A B)    1995(C A)
       FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD:         --------    --------    --------    ---------    ---------
<S>                                                           <C>         <C>         <C>         <C>          <C>
Net asset value, beginning of period........................  $  14.57    $  16.23    $  15.18    $  13.98     $  12.36
Income from investment operations
  Net investment income.....................................      0.54(E)     0.55(E)     0.70(E)     0.63(E)      0.58
  Net gains (losses) on securities (realized and
    unrealized).............................................     (0.39)(E)     0.76(E)     2.13(E)     1.61(E)     1.71
                                                              --------    --------    --------    --------     --------
Total from investment operations............................      0.15        1.31        2.83        2.24         2.29
                                                              --------    --------    --------    --------     --------
Less distributions:
  Dividends from net investment income......................     (0.53)      (0.71)      (0.62)      (0.60)       (0.53)
  Distributions from net realized gains on securities.......     (1.17)      (2.26)      (1.16)      (0.44)       (0.14)
                                                              --------    --------    --------    --------     --------
Total distributions.........................................     (1.70)      (2.97)      (1.78)      (1.04)       (0.67)
                                                              --------    --------    --------    --------     --------
Net asset value, end of period..............................  $  13.02    $  14.57    $  16.23    $  15.18     $  13.98
                                                              ========    ========    ========    ========     ========
Total return................................................      0.83%       9.34%      20.36%      16.77%       19.77%
                                                              ========    ========    ========    ========     ========
Ratios and supplemental data:
  Net assets, end of period (in thousands)..................  $840,935    $886,908    $769,289    $576,673     $542,619
  Ratios to average net assets (annualized)
    Expenses................................................      0.34%(E)    0.33%(E)    0.34%(E)    0.37%(E)     0.38%
    Net investment income...................................      3.81%(E)    3.79%(E)    4.09%(E)    4.26%(E)     4.54%
Portfolio turnover rate(D)..................................        90%         87%        105%         76%          73%
</TABLE>

(A)Class expenses per share were subtracted from net investment income per share
   for the Fund before class expenses to determine net investment income per
   share.

(B)Brandywine Asset Management, Inc. replaced Capital Guardian Trust Company as
   an investment adviser to the Fund as of April 1, 1996.

(C)GSB Investment Management, Inc. was added as an investment adviser to the
   Balanced Fund on January 1, 1995.

(D)On November 1, 1995 the Balanced Fund began investing all of its investable
   assets in a corresponding portfolio of the AMR Trust. Portfolio turnover rate
   since November 1, 1995 is that of its corresponding Portfolio.

(E)The per share amounts and ratios reflect income and expenses assuming
   inclusion of the Fund's proportionate share of the income and expenses of its
   corresponding Portfolio.

<TABLE>
<CAPTION>
                                                                              LARGE CAP VALUE FUND-AMR CLASS
                                                             ----------------------------------------------------------------
                                                                                  YEAR ENDED OCTOBER 31,
                                                             ----------------------------------------------------------------
                                                             1999(A E)      1998(A)       1997(A)      1996(A B)     1995(A)
      FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD:         ----------    ----------    ----------    ----------    --------
<S>                                                          <C>           <C>           <C>           <C>           <C>
Net asset value, beginning of period.......................  $    21.03    $    21.70    $    18.56    $    15.95    $  14.20
Income from investment operations
  Net investment income....................................        0.49(D)       0.46(D)       0.45(D)       0.47(D)     0.44
  Net gains (losses) on securities (realized and
    unrealized)............................................       (0.02)(D)       0.89(D)       4.47(D)       3.15(D)     2.30
                                                             ----------    ----------    ----------    ----------    --------
Total from investment operations...........................        0.47          1.35          4.92          3.62        2.74
                                                             ----------    ----------    ----------    ----------    --------
Less distributions:
  Dividends from net investment income.....................       (0.47)        (0.44)        (0.47)        (0.44)      (0.45)
  Distributions from net realized gains on securities......       (2.26)        (1.58)        (1.31)        (0.57)      (0.54)
                                                             ----------    ----------    ----------    ----------    --------
Total distributions........................................       (2.73)        (2.02)        (1.78)        (1.01)      (0.99)
                                                             ----------    ----------    ----------    ----------    --------
Net asset value, end of period.............................  $    18.77    $    21.03    $    21.70    $    18.56    $  15.95
                                                             ==========    ==========    ==========    ==========    ========
Total return...............................................        1.97%         6.56%        28.40%        23.66%      21.03%
                                                             ==========    ==========    ==========    ==========    ========
Ratios and supplemental data:
  Net assets, end of period (in thousands).................  $1,384,358    $1,614,432    $1,431,805    $1,008,518    $706,884
  Ratios to average net assets (annualized)
    Expenses...............................................        0.34%(D)      0.31%(D)      0.34%(D)      0.36%(D)    0.38%
    Net investment income..................................        2.17%(D)      2.12%(D)      2.45%(D)      2.80%(D)    3.20%
Portfolio turnover rate(C).................................          33%           40%           35%           40%         26%
</TABLE>

(A) Class expenses per share were subtracted from net investment income per
    share for the Fund before class expenses to determine net investment income
    per share.

(B) Brandywine Asset Management, Inc. replaced Capital Guardian Trust Company as
    an investment adviser to the Fund as of April 1, 1996.

(C) On November 1, 1995 the Large Cap Value Fund began investing all of its
    investable assets in a corresponding Portfolio of the AMR Trust. Portfolio
    turnover rate since November 1, 1995 is that of its corresponding Portfolio.

(D) The per share amounts and ratios reflect income and expenses assuming
    inclusion of the Fund's proportionate share of the income and expenses of
    its corresponding Portfolio.

(E) Prior to March 1, 1999, the Large Cap Value Fund was known as the Growth and
    Income Fund.

- --------------------------------------------------------------------------------
Prospectus                             25                 Additional Information
<PAGE>   108

<TABLE>
<CAPTION>
                                                              SMALL CAP VALUE FUND-
                                                                    AMR CLASS
                                                              ---------------------
                                                                   MARCH 1 TO
                                                                OCTOBER 31, 1999
       FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD:         ---------------------
<S>                                                           <C>
Net asset value, beginning of period........................         $  9.13
                                                                     -------
Income from investment operations:
  Net investment income(A)..................................            0.04
  Net gains (losses) on securities (both realized and
    unrealized)(A)..........................................           (0.09)
                                                                     -------
Total from investment operations............................           (0.05)
                                                                     -------
Less distributions:
  Dividends from net investment income......................              --
  Distributions from net realized gains on securities.......              --
                                                                     -------
Total distributions.........................................              --
                                                                     -------
Net asset value, end of period..............................         $  9.08
                                                                     =======
Total return (not annualized)...............................           (0.55)%
                                                                     =======
Ratios and supplemental data:
  Net assets, end of period (in thousands)..................         $64,662
  Ratios to average net assets (annualized)(A):
    Expenses................................................            0.70%
    Net investment income...................................            1.14%
    Decrease reflected in above expense ratio due to
     absorption of expenses by the Manager..................            0.24%
Portfolio turnover rate(B)..................................              31%
</TABLE>

(A) The per share amounts and ratios reflect income and expenses assuming
    inclusion of the Fund's proportionate share of the income and expenses of
    the AMR Investment Services Small Cap Value Portfolio.

(B) The Small Cap Value Fund invests all of its investable assets in a
    corresponding Portfolio of the AMR Trust. Portfolio turnover rate is that of
    the Portfolio.

<TABLE>
<CAPTION>
                                                                        INTERNATIONAL EQUITY FUND-AMR CLASS()
                                                              ---------------------------------------------------------
                                                                               YEAR ENDED OCTOBER 31,
                                                              ---------------------------------------------------------
                                                              1999(A B)    1998(A)     1997(A)     1996(A)     1995(A)
       FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD:         ---------    --------    --------    --------    --------
<S>                                                           <C>          <C>         <C>         <C>         <C>
Net asset value, beginning of period........................  $  17.01     $  17.15    $  15.06    $  13.31    $  12.87
Income from investment operations Net investment income.....   0.39(D)         0.37(D)     0.37(D)     0.31(D)     0.30
    Net gains on securities (realized and unrealized).......   2.94(D)         0.34(D)     2.46(D)     1.98(D)     0.68
                                                              --------     --------    --------    --------    --------
Total from investment operations............................      3.33         0.71        2.83        2.29        0.98
                                                              --------     --------    --------    --------    --------
Less distributions:
  Dividends from net investment income......................     (0.39)       (0.37)      (0.33)      (0.30)      (0.22)
  Distributions from net realized gains on securities.......     (0.49)       (0.48)      (0.41)      (0.24)      (0.32)
                                                              --------     --------    --------    --------    --------
Total distributions.........................................     (0.88)       (0.85)      (0.74)      (0.54)      (0.54)
                                                              --------     --------    --------    --------    --------
Net asset value, end of period..............................  $  19.46     $  17.01    $  17.15    $  15.06    $  13.31
                                                              ========     ========    ========    ========    ========
Total return................................................     20.27%        4.44%      19.39%      17.72%       8.18%
                                                              ========     ========    ========    ========    ========
Ratios and supplemental data:
  Net assets, end of period (in thousands)..................  $602,593     $496,040    $464,588    $330,898    $227,939
  Ratios to average net assets (annualized)
    Expenses................................................      0.39%(D)     0.53%(D)    0.58%(D)    0.57%(D)    0.60%
    Net investment income...................................      2.25%(D)     2.26%(D)    2.51%(D)    2.49%(D)    2.65%
Portfolio turnover rate(C)..................................        63%          24%         15%         19%         21%
</TABLE>

(A)Class expenses per share were subtracted from net investment income per share
   for the Fund before class expenses to determine net investment income per
   share.

(B)Morgan Stanley Asset Management, Inc. was replaced as investment adviser to
   the International Equity Fund on March 1, 1999 by Lazard Asset Management and
   Independence Investment Associates.

(C)On November 1, 1995 the International Equity Fund began investing all of its
   investable assets in a corresponding Portfolio of the AMR Trust. Portfolio
   turnover rate since November 1, 1995 is that of its corresponding Portfolio.

(D)The per share amounts and ratios reflect income and expenses assuming
   inclusion of the Fund's proportionate share of the income and expenses of its
   corresponding Portfolio.

- --------------------------------------------------------------------------------
Additional Information                 26                             Prospectus
<PAGE>   109

<TABLE>
<CAPTION>
                                                                         S&P 500
                                                                       INDEX FUND-
                                                                 INSTITUTIONAL CLASS(A)
                                                              -----------------------------
                                                                 YEAR ENDED DECEMBER 31
                                                              -----------------------------
                                                                1999       1998     1997(B)
       FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD:         --------   --------   -------
<S>                                                           <C>        <C>        <C>
Net asset value, beginning of period........................  $  16.78   $  13.16   $10.00
Income from investment operations
  Net investment income(C)..................................      0.19       0.16     0.14
  Net gains on securities (realized and unrealized)(C)......      3.27       3.62     3.16
                                                              --------   --------   ------
Total from investment operations............................      3.46       3.78     3.30
                                                              --------   --------   ------
Less distributions:
  Dividends from net investment income......................     (0.19)     (0.16)   (0.14)
                                                              --------   --------   ------
Total distributions.........................................     (0.19)     (0.16)   (0.14)
                                                              --------   --------   ------
Net asset value, end of period..............................  $  20.05   $  16.78   $13.16
                                                              ========   ========   ======
Total return................................................    20.70%      28.87%   33.09%
                                                              ========   ========   ======
Ratios and supplemental data:
  Net assets, end of period (in thousands)..................  $568,645   $100,870   $7,862
  Ratios to average net assets(C)
    Net investment income...................................      1.28%      1.41%    1.61%
    Expenses................................................      0.17%      0.20%    0.20%
    Decrease reflected in above expense ratio due to
     absorption of expenses by Bankers Trust and the
     Manager................................................        --       0.06%    0.43%
Portfolio turnover rate(D)..................................        13%         4%      19%
</TABLE>

(A)Prior to March 1, 2000, the S&P 500 Index Fund-Institutional Class invested
   all of its investable assets in the BT Equity 500 Index Portfolio, a separate
   investment company managed by Bankers Trust Company.

(B)The S&P 500 Index Fund-Institutional Class commenced active operations on
   December 31, 1996 and on March 1, 1998, existing shares were designated
   Institutional Class shares.

(C)The per share amounts and ratios reflect income and expenses assuming
   inclusion of the Fund's proportionate share of the income and expenses of the
   Equity 500 Index Portfolio.

(D)Portfolio turnover rate is that of the Equity 500 Index Portfolio.

<TABLE>
<CAPTION>
                                                              INTERMEDIATE
                                                              BOND FUND --
                                                               AMR CLASS
                                                              ------------
                                                                MARCH 1
                                                                   TO
                                                              OCTOBER 31,
                                                                  1999
       FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD:         ------------
<S>                                                           <C>            <C>       <C>       <C>       <C>
Net asset value, beginning of period........................    $  9.95
                                                                -------
Income from investment operations:
  Net investment income(A)..................................       0.39
  Net gains (losses) on securities (both realized and
    unrealized)(A)..........................................      (0.37)
                                                                -------
Total from investment operations............................       0.02
                                                                -------
Less distributions:
  Dividends from net investment income......................      (0.39)
  Distributions from net realized gains on securities.......         --
                                                                -------
Total distributions.........................................      (0.39)
                                                                -------
Net asset value, end of period..............................    $  9.58
                                                                =======
Total return (not annualized)...............................      (0.17)%
                                                                =======
Ratios and supplemental data:
  Net assets, end of period (in thousands)..................    $46,655
  Ratios to average net assets (annualized)(A):
    Expenses................................................      0.30%
    Net investment income...................................      6.12%
Portfolio turnover rate(B)..................................       123%
</TABLE>

(A)The per share amounts and ratios reflect income and expenses assuming
   inclusion of the Fund's proportionate share of the income and expenses of the
   AMR Investment Services Intermediate Bond Portfolio.

(B)The Intermediate Bond Fund invests all of its investable assets in a
   corresponding Portfolio of the AMR Trust. Portfolio turnover rate is that of
   the Portfolio.

- --------------------------------------------------------------------------------
Prospectus                             27                 Additional Information
<PAGE>   110

<TABLE>
<CAPTION>
                                                                      SHORT-TERM BOND FUND-AMR CLASS
                                                              -----------------------------------------------
                                                                          YEAR ENDED OCTOBER 31,
                                                              -----------------------------------------------
                                                               1999     1998(A)    1997      1996      1995
       FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD:         -------   -------   -------   -------   -------
<S>                                                           <C>       <C>       <C>       <C>       <C>
Net asset value, beginning of period........................  $  9.62   $  9.62   $  9.67   $  9.81   $  9.68
Income from investment operations
  Net investment income.....................................  0.59(C)   0.65(C)   0.66(C)   0.65(C)      0.64
  Net gains (losses) on securities (realized and
    unrealized).............................................    (0.33)(C)  -- (C)   (0.05)(C)   (0.14)(C)    0.13
                                                                        -------   -------   -------   -------
Total from investment operations............................     0.26      0.65      0.61      0.51      0.77
                                                              -------   -------   -------   -------   -------
Less distributions:
  Dividends from net investment income......................    (0.59)    (0.65)    (0.66)    (0.65)    (0.64)
  Distributions from net realized gains on securities.......       --        --        --        --        --
                                                              -------   -------   -------   -------   -------
Total distributions.........................................    (0.59)    (0.65)    (0.66)    (0.65)    (0.64)
                                                              -------   -------   -------   -------   -------
Net asset value, end of period..............................  $  9.29   $  9.62   $  9.62   $  9.67   $  9.81
                                                              =======   =======   =======   =======   =======
Total return................................................     2.83%     6.93%     6.57%     5.38%     8.22%
                                                              =======   =======   =======   =======   =======
Ratios and supplemental data:
  Net assets, end of period (in thousands)..................  $66,767   $95,056   $64,010   $59,526   $64,595
  Ratios to average net assets (annualized)
    Expenses................................................     0.35%(C)  0.34%(C)  0.32%(C)  0.33%(C)  0.36%
    Net investment income...................................     6.26%(C)  6.71%(C)  6.90%(C)  6.66%(C)  6.60%
Portfolio turnover rate(B)..................................      115%       74%      282%      304%      183%
</TABLE>

(A)Prior to March 1, 1998, the Short-Term Bond Fund was known as the
   Limited-Term Income Fund.

(B)On November 1, 1995 the Short-Term Bond Fund began investing all of its
   investable assets in a corresponding Portfolio of the AMR Trust. Portfolio
   turnover rate since November 1, 1995 is that of its corresponding Portfolio.

(C)The per share amounts and ratios reflect income and expenses assuming
   inclusion of the Fund's proportionate share of the income and expenses of its
   corresponding Portfolio.

- --------------------------------------------------------------------------------
Additional Information                 28                             Prospectus
<PAGE>   111

                                  -- Notes --
<PAGE>   112

                                  -- Notes --
<PAGE>   113

                                  -- Notes --
<PAGE>   114

ADDITIONAL INFORMATION

ADDITIONAL INFORMATION ABOUT THE FUNDS IS FOUND IN THE DOCUMENTS LISTED BELOW.
REQUEST A FREE COPY OF THESE DOCUMENTS BY CALLING (800) 433-2434.



ANNUAL REPORT/SEMI-ANNUAL REPORT

The Funds' Annual and Semi-Annual Reports list each Fund's actual investments as
of the report's date. They also include a discussion by the Manager of market
conditions and investment strategies that significantly affected the Funds'
performance. The report of the Funds' independent auditors is included in the
Annual Report.

STATEMENT OF ADDITIONAL INFORMATION (SAI)

The SAI contains more details about the Funds and their investment policies. The
SAI is incorporated in this Prospectus by reference (it is legally part of this
Prospectus). A current SAI is on file with the Securities and Exchange
Commission (SEC).

To obtain more information about the Funds or to request a copy of the documents
listed above:

<TABLE>
<S>                  <C>                              <C>                                     <C>
      [PHONE]                  [MAILBOX]                           [KEYBOARD]                               [MOUSE]

   By Telephone:               By Mail:                            By E-mail:
Call (800) 388-3344   American AAdvantage Funds        [email protected]             On the Internet:
                       P.O. Box 619003, MD5645                                                Visit our website at www.aafunds.com
                      DFW Airport, TX 75261-9003                                              Visit the SEC website at www.sec.gov
</TABLE>


Copies of these documents may also be obtained from the SEC Public Reference
Room by mailing a request, including a duplicating fee to: SEC's Public
Reference Section, 450 5th Street NW, Washington, D.C. 20549-6009. The Public
Reference Room can be reached at (202) 942-8090.



Fund Service Providers:

<TABLE>
<S>                      <C>                          <C>                      <C>
CUSTODIAN                  TRANSFER AGENT             INDEPENDENT AUDITORS      DISTRIBUTOR
STATE STREET BANK          STATE STREET BANK          ERNST & YOUNG LLP         SWS FINANCIAL SERVICES
  AND TRUST                 AND TRUST (AMR CLASS)     Dallas, Texas             Dallas, Texas
Boston, Massachusetts      Boston, Massachusetts

                           NATIONAL FINANCIAL
                            DATA SERVICES
                           (INSTITUTIONAL CLASS)
                           Kansas City, Missouri
</TABLE>


                        [AMERICAN AADVANTAGE FUNDS LOGO]


                            SEC File Number 811-4984

American Airlines is not responsible for investments made in the American
AAdvantage Funds. American AAdvantage Funds is a registered service mark of AMR
Corporation. American AAdvantage Balanced Fund, American AAdvantage Large Cap
Value Fund, American AAdvantage International Equity Fund, American AAdvantage
Intermediate Bond Fund, American AAdvantage Short-Term Bond Fund and American
AAdvantage Small Cap Value Fund are service marks of AMR Investment Services,
Inc. Russell 2000 is a registered service mark of the Frank Russell Company.

<PAGE>   115
- --------------------------------------------------------------------------------

                               PLATINUM CLASS(SM)

- --------------------------------------------------------------------------------


                      [AMERICAN AADVANTAGE FUNDS(R) LOGO]

                                   PROSPECTUS
                                 MARCH 1, 2000




                                    AMERICAN
                              AADVANTAGE FUNDS(R)


o   MONEY MARKET FUND

o   MUNICIPAL MONEY
    MARKET FUND

o   U.S. GOVERNMENT MONEY
    MARKET FUND



                               AMERICAN AADVANTAGE
                                MILEAGE FUNDS(R)


o   MONEY MARKET MILEAGE FUND

o   MUNICIPAL MONEY MARKET
    MILEAGE FUND

o   U.S. GOVERNMENT MONEY
    MARKET MILEAGE FUND



The Securities and Exchange Commission does not guarantee that the information
in this Prospectus or any other mutual fund's prospectus is accurate or
complete, nor does it judge the investment merit of these Funds. To state
otherwise is a criminal offense.


Managed by AMR Investment Services, Inc.

<PAGE>   116

     TABLE OF CONTENTS
- ---------------------------

<TABLE>
    <S>                                                           <C>
    About the Funds
    Overview....................................................    3
    Investment Objective........................................    4
    Principal Strategies........................................    4
    Risk Factors................................................    6
    Investor Profile............................................    7
    Historical Performance......................................    7
    Fees and Expenses...........................................   14
    Examples....................................................   15
    The Manager.................................................   15
    Valuation of Shares.........................................   16
    About Your Investment
    Purchase and Redemption of Shares...........................   16
    Distributions and Taxes.....................................   22
    AAdvantage(R) Miles.........................................   23
    Additional Information
    Distribution of Trust Shares................................   25
    Master-Feeder Structure.....................................   25
    Financial Highlights........................................   26
</TABLE>

- --------------------------------------------------------------------------------

About the Funds                         2                             Prospectus
<PAGE>   117

ABOUT THE FUNDS
- -------------------------

<TABLE>
<S>                             <C>
Overview                        The American AAdvantage Funds (the "AAdvantage
- --------                        Funds") and the American AAdvantage Mileage
                                Funds (the "Mileage Funds") are managed by AMR
                                Investment Services, Inc. (the "Manager"), a
                                wholly owned subsidiary of AMR Corporation.
                                The AAdvantage Funds and Mileage Funds
                                (collectively, the "Funds") operate under a
                                master-feeder structure. This means that each
                                Fund seeks its investment objective by investing
                                all of its investable assets in a corresponding
                                Portfolio of the AMR Investment Services Trust
                                ("AMR Trust") that has a similar name and
                                identical investment objective. Throughout this
                                Prospectus, statements regarding investments by
                                a Fund refer to investments made by its
                                corresponding Portfolio. For easier reading, the
                                term "Fund" is used throughout the Prospectus to
                                refer to either a Fund or its Portfolio, unless
                                stated otherwise. See "Master-Feeder Structure".
                                Each shareholder of the Mileage Funds will
                                receive American Airlines(R) AAdvantage(R)
                                travel awards program ("AAdvantage") miles.(1)
                                AAdvantage miles will be posted monthly to each
                                shareholder's AAdvantage account at an annual
                                rate of one mile for every $10 invested in the
                                Fund. See "AAdvantage Miles".
</TABLE>

- ---------------

(1)American Airlines and AAdvantage are registered trademarks of American
Airlines, Inc.
- --------------------------------------------------------------------------------

Prospectus                              3                        About the Funds
<PAGE>   118

Money Market Funds ("Money Market Funds")
- ------------------------------------------------------
American AAdvantage Money Market Fund
American AAdvantage Money Market Mileage Fund

Municipal Money Market Funds ("Municipal Funds")
- ----------------------------------------------------
American AAdvantage Municipal Money Market Fund
American AAdvantage Municipal Money Market Mileage Fund

U.S. Government Money Market Funds ("Government Funds")
- -----------------------------------------------------------
American AAdvantage U.S. Government Money Market Fund
American AAdvantage U.S. Government Money Market Mileage Fund
- --------------------------------------------------------------------------------

<TABLE>
<S>                             <C>
INVESTMENT OBJECTIVE            Current income, liquidity and the maintenance of
- ----------------------          a stable price of $1.00 per share.
(All Funds)
</TABLE>

<TABLE>
<S>                             <C>
PRINCIPAL STRATEGIES            Each Money Market Fund invests exclusively in
- --------------------            high quality variable or fixed rate, U.S.
(Money Market Funds)            dollar-denominated short-term money market
                                instruments. These securities may include
                                obligations of the U.S. Government, its agencies
                                and instrumentalities; corporate debt
                                securities, such as commercial paper, master
                                demand notes, loan participation interests,
                                medium-term notes and funding agreements;
                                Yankeedollar and Eurodollar bank certificates of
                                deposit, time deposits, and bankers'
                                acceptances; asset-backed securities; and
                                repurchase agreements involving the foregoing
                                obligations.
                                Each Fund will only buy securities with the
                                following credit qualities:
                                - rated in the highest short-term categories by
                                two rating organizations, such as "A-1" by
                                  Standard & Poor's Corporation and "P-1" by
                                  Moody's Investors Service, Inc., at the time
                                  of purchase,
                                - rated in the highest short-term category by
                                one rating organization if the securities are
                                  rated only by one rating organization, or
                                - unrated securities that are determined to be
                                of equivalent quality by the Manager pursuant to
</TABLE>

- --------------------------------------------------------------------------------

About the Funds                         4                             Prospectus
<PAGE>   119
<TABLE>
<S>                             <C>
                                  guidelines approved by each Fund's Board of
                                  Trustees.
                                Each Fund invests more than 25% of its total
                                assets in obligations issued by the banking
                                industry. However, for temporary defensive
                                purposes when the Manager believes that
                                maintaining this concentration may be
                                inconsistent with the best interests of
                                shareholders, a Fund may not maintain this
                                concentration.
                                Securities purchased by each Fund generally have
                                remaining maturities of 397 days or less,
                                although instruments subject to repurchase
                                agreements and certain variable and floating
                                rate obligations may bear longer final
                                maturities. The average dollar-weighted maturity
                                of each Fund will not exceed 90 days.
</TABLE>

<TABLE>
<S>                             <C>
(Municipal Funds)               Under normal market conditions, each Municipal
                                Fund invests at least 80% of its net assets in
                                securities whose interest income is exempt from
                                federal income tax. These securities may be
                                issued by or on behalf of the governments of
                                U.S. states, counties, cities, towns,
                                territories, or public authorities. All
                                securities purchased by each Fund will be
                                guaranteed by the U.S. Government, its agencies,
                                or instrumentalities; secured by irrevocable
                                letters of credit issued by qualified banks; or
                                guaranteed by one or more municipal bond
                                insurance policies.

                                Each Fund will only buy securities with the
                                following credit qualities:

                                - rated in the highest short-term categories by
                                two rating organizations, such as "A-1" by
                                  Standard & Poor's and "P-1" by Moody's
                                  Investors Service, Inc., at the time of
                                  purchase,
                                - rated in the highest short-term category by
                                one rating organization if the securities are
                                  rated only by one rating organization, or
</TABLE>

- --------------------------------------------------------------------------------

Prospectus                              5                        About the Funds
<PAGE>   120
<TABLE>
<S>                             <C>
                                - unrated securities that are determined to be
                                of equivalent quality by the Manager pursuant to
                                  guidelines approved by each Fund's Board of
                                  Trustees.
                                Securities purchased by each Fund generally have
                                remaining maturities of 397 days or less,
                                although instruments subject to repurchase
                                agreements and certain variable and floating
                                rate obligations may bear longer final
                                maturities. The average dollar-weighted maturity
                                of each Fund will not exceed 90 days.
</TABLE>

<TABLE>
<S>                             <C>
(Government Funds)              Each Government Fund invests exclusively in
                                obligations issued or guaranteed by the U.S.
                                Government, its agencies or instrumentalities
                                and repurchase agreements that are
                                collateralized by such obligations. Some of
                                these securities are not backed by the full
                                faith and credit of the U.S. Government. U.S.
                                Government securities include direct obligations
                                of the U.S. Treasury (such as Treasury bills,
                                Treasury notes and Treasury bonds).
                                Securities purchased by each Fund generally have
                                remaining maturities of 397 days or less,
                                although instruments subject to repurchase
                                agreements and certain variable and floating
                                rate obligations may bear longer final
                                maturities. The average dollar-weighted maturity
                                of each Fund will not exceed 90 days.
</TABLE>

<TABLE>
<S>                             <C>
RISK FACTORS                    - The yield paid by each Fund is subject to
- -------------                   changes in interest rates. As a result, there is
(All Funds)                       risk that a decline in short-term interest
                                  rates would lower its yield and the overall
                                  return on your investment.
                                - Although each Fund seeks to preserve the value
                                of your investment at $1.00 per share, it is
                                  possible to lose money by investing in the
                                  Fund.
                                Your investment in a Fund is not insured or
                                guaranteed by the U.S. Government or any
                                financial or government institution.
</TABLE>

- --------------------------------------------------------------------------------

About the Funds                         6                             Prospectus
<PAGE>   121

<TABLE>
<S>                             <C>
(Money Market and               - As with any money market fund, there is the
Municipal Funds)                risk that the issuers or guarantors of
                                  securities owned by each Fund will default on
                                  the payment of principal or interest or the
                                  obligation to repurchase securities from each
                                  Fund.
</TABLE>

<TABLE>
<S>                             <C>
INVESTOR PROFILE                All of the Funds may be suitable for investors
- ----------------                who:
(All Funds)
                                - seek the preservation of capital and to avoid
                                  fluctuations in principal
                                - desire regular, monthly income from a highly
                                  liquid investment
                                - require a short-term vehicle for cash when
                                making long-term investment decisions
                                - seek a rate of return that is potentially
                                higher than certificates of deposit or savings
                                  accounts
</TABLE>

<TABLE>
<S>                             <C>
(Municipal Funds)               The Municipal Funds may be suitable for
                                investors who:
                                - desire regular, monthly income that is
                                generally exempt from Federal income tax
                                - seek an after-tax rate of return that is
                                potentially higher than certificates of deposit
                                  or savings accounts
</TABLE>

<TABLE>
<S>                             <C>
(Mileage Funds)                 The Mileage Funds may be suitable for investors
                                who desire to receive miles in the American
                                Airlines AAdvantage(R) program.
</TABLE>

<TABLE>
<S>                             <C>
HISTORICAL PERFORMANCE          The bar charts and tables below provide an
- -------------------------       indication of risk by showing how each Fund's
                                performance has varied from year to year. Past
                                performance is not necessarily indicative of how
                                each Fund will perform in the future. You may
                                call 1-800-388-3344 to obtain each Fund's
                                current seven-day yield.
</TABLE>

- --------------------------------------------------------------------------------

Prospectus                              7                        About the Funds
<PAGE>   122

<TABLE>
<S>                             <C>
(American AAdvantage            The Platinum Class of the Fund began offering
Money Market Fund (sm))         its shares on November 7, 1995. However, another
                                class of shares of the Fund not offered in this
                                prospectus has been offered since September 1,
                                1987. In the chart and table below, performance
                                results before November 7, 1995 are for the
                                older class. Because the other class had lower
                                expenses, its performance was better than the
                                Platinum Class of the Fund would have realized
                                in the same period.
</TABLE>

                                    [GRAPH]

          TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>
90..........................................................    8.40%
91..........................................................    6.77%
92..........................................................    4.02%
93..........................................................    3.28%
94..........................................................    4.22%
95..........................................................    5.93%
96..........................................................    4.77%
97..........................................................    4.90%
98..........................................................    4.82%
99..........................................................    4.41%
</TABLE>

<TABLE>
<S>                          <C>
Highest Quarterly Return:             2.06%
  (1/1/90 through 12/31/99)     (2nd Quarter 1990)
Lowest Quarterly Return:              0.80%
  (1/1/90 through 12/31/99)  (2nd & 4th Quarter 1993,
                                1st Quarter 1994)
</TABLE>

<TABLE>
<CAPTION>
                                                                 AVERAGE ANNUAL TOTAL
                                                                        RETURN
                                                              ---------------------------
                                                                    AS OF 12/31/99
                                                              ---------------------------
                                                              1 YEAR   5 YEARS   10 YEARS
                                                              ------   -------   --------
<S>                                                           <C>      <C>       <C>
Money Market Fund...........................................  4.41%     4.96%     5.14%
</TABLE>

<TABLE>
<S>                             <C>
(American AAdvantage            The Fund's performance, as shown in the chart
Money Market Mileage            and table below, is derived from a combination
Fund (sm))                      of the Fund's performance and that of another
                                fund (the "Companion Fund") not offered in this
                                prospectus. The Companion Fund has been managed
                                by the
</TABLE>

- --------------------------------------------------------------------------------

About the Funds                         8                             Prospectus
<PAGE>   123
<TABLE>
<S>                             <C>
                                Manager since its inception on September 1,
                                1987. Like the Fund, the Companion Fund invests
                                all of its investable assets in a corresponding
                                Portfolio of the AMR Trust. The performance
                                results from inception through October 31, 1995
                                are those of the Companion Fund. (Results
                                through October 31, 1991 are for the Companion
                                Fund's Institutional Class of shares and from
                                November 1, 1991 through October 31, 1995 are
                                for the Companion Fund's Mileage Class of
                                shares.) The Fund began offering it shares on
                                November 1, 1995. Performance results shown
                                below from that date through January 28, 1996
                                are for the initial class of Fund shares. The
                                Platinum Class of the Fund began offering its
                                shares on January 29, 1996. Thus, performance
                                results from that date through December 31, 1999
                                are for the Platinum Class of Fund shares.
                                Because the Companion Fund and the Fund's
                                initial class had lower expenses, their
                                performance was better than the Fund would have
                                realized in the same period.
</TABLE>

                                    [GRAPH]

          TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>
90..........................................................    8.40%
91..........................................................    6.77%
92..........................................................    4.02%
93..........................................................    3.28%
94..........................................................    4.22%
95..........................................................    5.93%
96..........................................................    4.56%
97..........................................................    4.74%
98..........................................................    4.67%
99..........................................................    4.30%
</TABLE>

<TABLE>
<S>                          <C>
Highest Quarterly Return:             2.06%
  (1/1/90 through 12/31/99)     (2nd Quarter 1990)
Lowest Quarterly Return:              0.74%
  (1/1/90 through 12/31/99)  (2nd & 4th Quarter 1993,
                                1st Quarter 1994)
</TABLE>

- --------------------------------------------------------------------------------

Prospectus                              9                        About the Funds

<TABLE>
<CAPTION>
                                                                 AVERAGE ANNUAL TOTAL
                                                                        RETURN
                                                              ---------------------------
                                                                    AS OF 12/31/99
                                                              ---------------------------
                                                              1 YEAR   5 YEARS   10 YEARS
                                                              ------   -------   --------
<S>                                                           <C>      <C>       <C>
Money Market Mileage Fund...................................  4.30%     4.80%     4.97%
</TABLE>

- --------------------------------------------------------------------------------

About the Funds                        10                             Prospectus
<PAGE>   124

<TABLE>
<S>                             <C>
(American AAdvantage            The Platinum Class of the Fund began offering
Municipal Money Market          its shares on November 7, 1995. However, another
Fund (sm))                      class of shares of the Fund not offered in this
                                prospectus has been offered since November 10,
                                1993. In the chart and table below, performance
                                results before November 7, 1995 are for the
                                older class. Because the other class had lower
                                expenses, its performance was better than the
                                Platinum Class of the Fund would have realized
                                in the same period.
</TABLE>

                                    [GRAPH]

          TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>
94..........................................................    2.66%
95..........................................................    3.71%
96..........................................................    2.78%
97..........................................................    2.83%
98..........................................................    2.64%
99..........................................................    2.34%
</TABLE>

<TABLE>
<S>                          <C>
Highest Quarterly Return:          1.00%
  (1/1/94 through 12/31/99)  (2nd Quarter 1995)
Lowest Quarterly Return:           0.49%
  (1/1/94 through 12/31/99)  (1st Quarter 1999)
</TABLE>

<TABLE>
<CAPTION>
                                                          AVERAGE ANNUAL TOTAL RETURN
                                                       ----------------------------------
                                                                 AS OF 12/31/99
                                                       ----------------------------------
                                                                          SINCE INCEPTION
                                                       1 YEAR   5 YEARS     (11/10/93)
                                                       ------   -------   ---------------
<S>                                                    <C>      <C>       <C>
Municipal Money Market Fund..........................  2.34%     2.86%         2.81%
</TABLE>

- --------------------------------------------------------------------------------

Prospectus                             11                        About the Funds
<PAGE>   125

<TABLE>
<S>                             <C>
(American AAdvantage            The Fund's performance, as shown in the chart
Municipal Money Market          and table below, is derived from a combination
Mileage Fund (sm))              of the Fund's performance and that of another
                                fund (the "Companion Fund") not offered in this
                                prospectus. The Companion Fund has been managed
                                by the Manager since its inception on November
                                10, 1993. Like the Fund, the Companion Fund
                                invests all of its investable assets in a
                                corresponding Portfolio of the AMR Trust. The
                                performance results from inception through
                                October 31, 1995 are those of the Companion
                                Fund's Mileage Class of shares. The Fund began
                                offering it shares on November 1, 1995.
                                Performance results shown below from that date
                                through October 31, 1999 are for the initial
                                class of Fund shares. The Platinum Class of the
                                Fund began offering its shares on November 1,
                                1999. Thus, performance results from that date
                                through December 31, 1999 are for the Platinum
                                Class of Fund shares. Because the Companion Fund
                                and the Fund's initial class had lower expenses,
                                their performance was better than the Fund would
                                have realized in the same period.
</TABLE>

                                    [GRAPH]

          TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>
94..........................................................    2.37%
95..........................................................    3.48%
96..........................................................    3.09%
97..........................................................    3.23%
98..........................................................    3.06%
99..........................................................    2.69%
</TABLE>

<TABLE>
<S>                                                           <C>
Highest Quarterly Return:                                           0.91%
  (1/1/94 through 12/31/99)                                   (2nd Quarter 1995)
Lowest Quarterly Return:                                            0.46%
  (1/1/94 through 12/31/99)                                   (1st Quarter 1994)
</TABLE>

- --------------------------------------------------------------------------------

About the Funds                        12                             Prospectus

<TABLE>
<CAPTION>
                                                           AVERAGE ANNUAL TOTAL RETURN
                                                         -------------------------------
                                                                 AS OF 12/31/99
                                                         -------------------------------
                                                                                SINCE
                                                                              INCEPTION
                                                         1 YEAR    5 YEARS    (11/10/93)
                                                         ------    -------    ----------
<S>                                                      <C>       <C>        <C>
Municipal Money Market Mileage Fund....................  2.69%      3.11%       2.96%
</TABLE>

- --------------------------------------------------------------------------------

Prospectus                             13                        About the Funds
<PAGE>   126

<TABLE>
<S>                             <C>
(American AAdvantage            The Platinum Class of the Fund began offering
U.S. Government Money           its shares on November 7, 1995. However, another
Market Fund (sm))               class of shares of the Fund not offered in this
                                prospectus has been offered since March 2, 1992.
                                In the chart and table below, performance
                                results before November 7, 1995 are for the
                                older class. Because the other class had lower
                                expenses, its performance was better than the
                                Platinum Class of the Fund would have realized
                                in the same period.
</TABLE>

                                    [GRAPH]

          TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>
93..........................................................    3.05%
94..........................................................    4.09%
95..........................................................    5.62%
96..........................................................    4.51%
97..........................................................    4.65%
98..........................................................    4.62%
99..........................................................    4.20%
</TABLE>

<TABLE>
<S>                          <C>
Highest Quarterly Return:          1.43%
  (1/1/93 through 12/31/99)  (2nd Quarter 1995)
Lowest Quarterly Return:           0.74%
  (1/1/93 through 12/31/99)  (4th Quarter 1993)
</TABLE>

<TABLE>
<CAPTION>
                                                      AVERAGE ANNUAL TOTAL RETURN
                                                   ----------------------------------
                                                             AS OF 12/31/99
                                                   ----------------------------------
                                                                      SINCE INCEPTION
                                                   1 YEAR   5 YEARS      (3/2/92)
                                                   ------   -------   ---------------
<S>                                                <C>      <C>       <C>
U.S. Government Money Market Fund................  4.20%     4.72%         4.30%
</TABLE>

<TABLE>
<S>                             <C>
(American AAdvantage            The Fund's performance, as shown in the chart
U.S. Government Money           and table below, is derived from a combination
Market Mileage Fund (sm))       of the Fund's performance and that of another
                                fund (the "Companion Fund") not offered in this
                                prospectus. The Companion Fund has been managed
                                by the
</TABLE>

- --------------------------------------------------------------------------------

About the Funds                        14                             Prospectus
<PAGE>   127
<TABLE>
<S>                             <C>
                                Manager since its inception on March 2, 1992.
                                Like the Fund, the Companion Fund invests all of
                                its investable assets in a corresponding
                                Portfolio of the AMR Trust. The performance
                                results from inception through October 31, 1995
                                are those of the Companion Fund. (Results
                                through October 31, 1993 are for the Companion
                                Fund's Institutional Class of shares and from
                                November 1, 1993 through October 31, 1995 are
                                for the Companion Fund's Mileage Class of
                                shares.) The Fund began offering it shares on
                                November 1, 1995. Performance results shown
                                below from that date through October 31, 1999
                                are for the initial class of Fund shares. The
                                Platinum Class of the Fund began offering its
                                shares on November 1, 1999. Thus, performance
                                results from that date through December 31, 1999
                                are for the Platinum Class of Fund shares.
                                Because the Companion Fund and the Fund's
                                initial class had lower expenses, their
                                performance was better than the Fund would have
                                realized in the same period.
</TABLE>

                                    [GRAPH]

          TOTAL RETURN FOR THE CALENDAR YEAR ENDED 12/31 OF EACH YEAR

<TABLE>
<S>                                                           <C>
93..........................................................    3.00%
94..........................................................    3.79%
95..........................................................    5.37%
96..........................................................    4.91%
97..........................................................    5.04%
98..........................................................    5.04%
99..........................................................    4.55%
</TABLE>

<TABLE>
<S>                                                           <C>
Highest Quarterly Return:                                           1.35%
  (1/1/93 through 12/31/99)                                   (2nd Quarter 1995)
Lowest Quarterly Return:                                            0.70%
  (1/1/93 through 12/31/99)                                   (4th Quarter 1993,
                                                              1st Quarter 1994)
</TABLE>

- --------------------------------------------------------------------------------

Prospectus                             15                        About the Funds

<TABLE>
<CAPTION>
                                                           AVERAGE ANNUAL TOTAL RETURN
                                                         -------------------------------
                                                                 AS OF 12/31/99
                                                         -------------------------------
                                                                                SINCE
                                                                              INCEPTION
                                                         1 YEAR    5 YEARS     (3/2/92)
                                                         ------    -------    ----------
<S>                                                      <C>       <C>        <C>
U.S. Government Money Market Mileage Fund..............   4.55%     4.98%        4.42%
</TABLE>

- --------------------------------------------------------------------------------

About the Funds                        16                             Prospectus
<PAGE>   128
FEES AND EXPENSES               This table describes the fees and expenses that
                                you may pay if you buy and hold shares of each
                                Fund. The expense table and the Examples below
                                reflect the expenses of each Fund and its
                                corresponding Portfolio.


[CHART]

<TABLE>
<CAPTION>
                                                                                                                U.S.
                                                     MONEY                          MUNICIPAL      U.S.      GOVERNMENT
                                                     MARKET    MONEY    MUNICIPAL     MONEY     GOVERNMENT     MONEY
                                                     ------   MARKET      MONEY      MARKET       MONEY        MARKET
                                                              MILEAGE    MARKET      MILEAGE      MARKET      MILEAGE
                                                              -------   ---------   ---------   ----------   ----------
<S>                                                  <C>      <C>       <C>         <C>         <C>          <C>

Management Fees....................................  0.10%     0.10%      0.10%       0.10%       0.10%        0.10%
Distribution (12b-1) Fees..........................  0.25%     0.25%      0.25%       0.25%       0.25%        0.25%
Other Expenses.....................................  0.60%(2)  0.75%      0.69%(2)    0.92%(1)    0.64%(2)     0.95%(1)
                                                     -----     -----      -----       -----       -----        -----

Total Annual Fund Operating Expenses...............  0.95%     1.10%      1.04%       1.27%       0.99%        1.30%
                                                     =====     =====      =====       =====       =====        =====

Fee Waiver and/or Expense Reimbursement............     --     0.01%(3)      --       0.17%(4)       --        0.20%(5)
Net Expenses.......................................  0.95%     1.09%      1.04%       1.10%       0.99%        1.10%
</TABLE>

(1) Other Expenses are based on estimates for the current fiscal year.

(2) Other Expenses reflects current fees.

(3) The Manager has contractually agreed to waive a portion of Distribution Fees
    for the Money Market Mileage Fund through December 31, 2000 to the extent
    that the Fund's Total Annual Fund Operating Expenses exceed 1.09%.

(4) The Manager has contractually agreed to waive a portion of Distribution Fees
    for the Municipal Money Market Mileage Fund through December 31, 2000 to the
    extent that the Fund's Total Annual Fund Operating Expenses exceed 1.10%.

(5) The Manager has contractually agreed to waive a portion of Distribution Fees
    for the U.S. Government Money Market Mileage Fund through December 31, 2000
    to the extent that the Fund's Total Annual Fund Operating Expenses exceed
    1.10%.

- --------------------------------------------------------------------------------

Prospectus                             17                        About the Funds
<PAGE>   129

EXAMPLES                        These examples are intended to help you compare
                                the cost of investing in each Fund with the cost
                                of investing in other mutual funds. The examples
                                assume that you invest $10,000 in each Fund for
                                the time periods indicated and then redeem all
                                of your shares at the end of those periods. The
                                examples also assume that your investment has a
                                5% return each year and that each Fund's
                                operating expenses remain the same. Although
                                your actual costs may be higher or lower, based
                                on these assumptions your costs would be:

<TABLE>
<CAPTION>
                                                                    1 YEAR   3 YEARS   5 YEARS   10 YEARS
                                                                    ------   -------   -------   --------
                      <S>                                           <C>      <C>       <C>       <C>
                      Money Market................................   $ 97     $303      $525      $1,166
                      Money Market Mileage*.......................   $111     $349      $605      $1,339
                      Municipal Money Market......................   $106     $331      $574      $1,271
                      Municipal Money Market Mileage*.............   $112     $386      $681      $1,519
                      U.S. Government Money Market................   $101     $315      $547      $1,213
                      U.S. Government Money Market Mileage*.......   $112     $392      $694      $1,550
</TABLE>

                                * Fee waivers are only guaranteed by the Manager
                                  through December 31, 2000. Therefore, net
                                  expenses are used to calculate the costs in
                                  the first year, and total fund expenses are
                                  used to calculate costs in the remaining nine
                                  years.

THE MANAGER                     The Funds have retained AMR Investment Services,
                                Inc. to serve as their Manager. The Manager,
                                located at 4333 Amon Carter Boulevard, Fort
                                Worth, Texas 76155, is a wholly owned subsidiary
                                of AMR Corporation, the parent company of
                                American Airlines, Inc. The Manager was
                                organized in 1986 to provide investment
                                management, advisory, administrative and asset
                                management consulting services. As of December
                                31, 1999, the Manager had approximately $21.7
                                billion of assets under management, including
                                approximately $8.4 billion under active
                                management and $13.3 billion as named fiduciary
                                or financial adviser. Of the total,
                                approximately $15.3 billion of assets are
                                related to AMR Corporation.
                                The Manager provides or oversees the provision
                                of all administrative, investment advisory and
                                portfolio management services to the Funds. The
                                Manager

- --------------------------------------------------------------------------------

About the Funds                        18                             Prospectus
<PAGE>   130
<TABLE>
<S>                             <C>
                                develops the investment programs for each Fund
                                and serves as the sole investment adviser to the
                                Funds. As compensation for providing management
                                services, each Fund pays the Manager an
                                annualized advisory fee that is calculated and
                                accrued daily, equal to the sum of 0.10% of the
                                net assets of the Fund.
</TABLE>

<TABLE>
<S>                             <C>
VALUATION OF SHARES             The price of each Fund's shares is based on its
- ---------------------           net asset value ("NAV") per share. Each Fund's
                                NAV is computed by adding total assets,
                                subtracting all of the Fund's liabilities, and
                                dividing the result by the total number of
                                shares outstanding. Securities held by the Funds
                                are valued in accordance with the amortized cost
                                method, which is designed to enable the Funds to
                                maintain a stable NAV of $1.00 per share. Debt
                                securities (other than short-term securities)
                                usually are valued on the basis of prices
                                provided by a pricing service. In some cases,
                                the price of debt securities is determined using
                                quotes obtained from brokers.
                                The NAV of Platinum Class shares will be
                                determined based on a pro rata allocation of
                                investment income, expenses and total capital
                                gains and losses. Each Fund's NAV per share is
                                determined as of the close of the New York Stock
                                Exchange ("Exchange"), generally 4:00 p.m.
                                Eastern time, on each day on which the Exchange
                                is open for business, with the exception of
                                Columbus Day and Veterans Day. The Funds are
                                closed and no NAV is calculated on these days.
</TABLE>

<TABLE>
<S>                             <C>
ABOUT YOUR INVESTMENT
- --------------------------------------------------------------------------------
PURCHASE AND REDEMPTION OF SHARES
- --------------------------------------------------------------------------------
</TABLE>

<TABLE>
<S>                             <C>
Eligibility                     Platinum Class shares are offered on a
                                continuous basis at net asset value through
                                selected financial institutions (such as banks
                                and broker-dealers). Shares of the Mileage Funds
                                are offered only to individuals and certain
                                grantor trusts. Qualified retirement plans (i.e.
                                IRAs, Keogh, profit sharing
</TABLE>

- --------------------------------------------------------------------------------

Prospectus                             19                  About Your Investment
<PAGE>   131
<TABLE>
<S>                             <C>
                                plans) and institutional investors are not
                                eligible to invest in the Mileage Funds.
</TABLE>

<TABLE>
<S>                             <C>
Purchase Policies               No sales charges are assessed on the purchase or
                                sale of Fund shares. Shares of the Funds are
                                offered and purchase orders accepted until the
                                deadlines listed below on each day on which the
                                Exchange is open for trading. In addition,
                                shares are not offered and orders are not
                                accepted on Columbus Day and Veterans Day.
</TABLE>

<TABLE>
<CAPTION>
                                                                    PURCHASE BY
                                             FUND                 (EASTERN TIME):*
                                             ----                 ----------------
                               <S>                                <C>
                               Money Market and
                                 Government Funds                     4:00 p.m.
                               Municipal Funds                       11:45 a.m.
                               * or the close of the Exchange
                                 (whichever comes first)
</TABLE>

<TABLE>
<S>                             <C>
                                If a purchase order is received in good order
                                prior to the applicable Fund's deadline, the
                                purchase price will be the NAV per share next
                                determined on that day. If a purchase order is
                                received in good order after the applicable
                                deadline, the purchase price will be the NAV of
                                the following day that the Fund is open for
                                business. Checks to purchase shares are accepted
                                subject to collection at full face value in U.S.
                                funds and must be drawn in U.S. dollars on a
                                U.S. bank.
</TABLE>

<TABLE>
<S>                             <C>
Opening an Account              A completed, signed application is required to
                                open an account. Financial institutions may have
                                different procedures for opening an account.
                                Eligible investors in the Mileage Funds can
                                enroll in the American Airlines AAdvantage(R)
                                Program by calling (800) 433-7300. You may
                                request a Fund application form by calling (800)
                                967-9009.
                                Complete the application, sign it and:
                                Mail to:
                                American AAdvantage Funds-Platinum Class
                                P.O. Box 619003, MD 5645
                                DFW Airport, TX 75261-9003
</TABLE>

- --------------------------------------------------------------------------------

About Your Investment                  20                             Prospectus
<PAGE>   132

<TABLE>
<S>                             <C>
Redemption Policies             Shares of any Fund may be redeemed by telephone
                                or mail on any day that the Fund is open for
                                business. The redemption price will be the NAV
                                next determined after a redemption order is
                                received in good order. Any questions regarding
                                what constitutes good order should be directed
                                to the financial institution through which Fund
                                shares were purchased. Proceeds from redemptions
                                requested by the following deadlines will
                                generally be wired to shareholders on the same
                                day.
</TABLE>

<TABLE>
<S>                             <C>
<CAPTION>
                                                                     SAME DAY
                                                                 WIRE REDEMPTION
                                                                  ORDER DEADLINE
                               FUND                              (EASTERN TIME)*:
                               ----                              ----------------
                               <S>                               <C>
                               Money Market and Government
                                 Funds                               2:00 p.m.
                               Municipal Funds                      11:45 a.m.
                                * or the close of the Exchange (whichever comes
                                                      first)
</TABLE>

<TABLE>
<S>                             <C>
                                In any event, proceeds from a redemption order
                                for any Fund will be transmitted to a
                                shareholder by no later than seven days after
                                the receipt of a redemption request in good
                                order. Delivery of proceeds from shares
                                purchased by check may be delayed until the
                                check has cleared, which may take up to 15 days.
                                The Funds reserve the right to suspend
                                redemptions or postpone the date of payment (i)
                                when the Exchange is closed (other than for
                                customary weekend and holiday closings); (ii)
                                when trading on the Exchange is restricted;
                                (iii) when the SEC determines that an emergency
                                exists so that disposal of a Fund's investments
                                or determination of its NAV is not reasonably
                                practicable; or (iv) by order of the SEC for
                                protection of the Funds' shareholders.
                                Although the Funds intend to redeem shares in
                                cash, each Fund reserves the right to pay the
                                redemption price in whole or in part by a
                                distribution of readily marketable securities
                                held by the applicable Fund's corresponding
                                Portfolio. Unpaid dividends credited to an
                                account up to the date of redemption of all
                                shares generally will be paid at the time of
                                redemption.
</TABLE>

- --------------------------------------------------------------------------------

Prospectus                             21                  About Your Investment
<PAGE>   133

HOW TO PURCHASE SHARES

<TABLE>
<CAPTION>
To Make an Initial Purchase                          To Add to an Existing Account
- ------------------------------------------------------------------------------------------
<S>                                           <C>
By Check
- - Make check payable to American AAdvantage   Include the shareholder's account number and
  Funds                                       Fund name and Fund number on the check. Mail
- - Include the Fund name, Fund number and      check ($50 minimum) to:
  "Platinum Class" on the check.
- - Mail check ($2,500 minimum) to:             American AAdvantage Funds
                                              P.O. Box 219643
American AAdvantage Funds                     Kansas City, MO 64121-9643
P.O. Box 219643
Kansas City, MO 64121-9643
By Wire
If your account has been established, you     Call (800) 388-3344 to purchase shares by
may call (800) 388-3344 to purchase shares    wire. Send a bank wire to State Street Bank
by wire. Send a bank wire to State Street     & Trust Co. with these instructions:
Bank & Trust Co. with these instructions:     - ABA# 0110-0002-8; AC-9905-342-3
- - ABA# 0110-0002-8; AC-9905-342-3             - Attn: American AAdvantage Funds
- - Attn: American AAdvantage Funds             - the Fund name and Fund number
- - the Fund name and Fund number               - account number and registration
- - account number and registration
By Exchange
Shares of an AAdvantage Fund or Mileage Fund  Shares of an AAdvantage Fund or Mileage Fund
may be purchased by exchange from another     may be redeemed in exchange for another
American AAdvantage Fund-Platinum Class or    American AAdvantage Fund-Platinum Class or
American AAdvantage Mileage Fund-Platinum     American AAdvantage Mileage Fund- Platinum
Class, as applicable, if the shareholder has  Class, as applicable, if the shareholder has
owned shares of the other AAdvantage Fund or  owned shares of the AAdvantage Fund or
Mileage Fund for at least 15 days. Send a     Mileage Fund for at least 15 days. Send a
written request to the address above or call  written request to the address above or call
(800) 388-3344 to exchange shares.            (800) 388-3344 to exchange shares.
</TABLE>

- --------------------------------------------------------------------------------

About Your Investment                  22                             Prospectus
<PAGE>   134

HOW TO REDEEM SHARES

<TABLE>
<CAPTION>
Method                                                  Additional Instructions
- ------------------------------------------------------------------------------------------
<S>                                           <C>
By Telephone
Call (800) 388-3344 to request a redemption.  Proceeds from redemptions placed by
                                              telephone will generally be transmitted by
                                              wire only, as instructed on the application
                                              form.
By Mail
Write a letter of instruction including       - Other supporting documents may be required
- - the Fund name, Fund number and class        for estates, trusts, guardianships,
- - shareholder account number                  custodians, corporations, IRAs and welfare,
- - shares or dollar amount to be redeemed      pension and profit sharing plans. Call (800)
- - authorized signature(s) of all persons        388-3344 for instructions.
  required to sign for the account            - Proceeds will only be mailed to the
                                              account address of record or transmitted by
Mail to:                                        wire to a commercial bank account
American AAdvantage Funds                       designated on the account application
P.O. Box 219643                                 form.
Kansas City, MO 64121-9643
By Check
Choose the check writing feature on the       - Minimum check amount is $100
account application.                          - A $2 service fee per check is charged for
                                                check copies
                                              - A $15 service fee will be charged when a
                                                check is presented for an amount greater
                                                than the value of the shareholder's
                                                account
                                              - A $12 fee will be charged for "stop
                                                payment" requests
By Pre-Authorized Automatic Redemption
Contact the financial institution through     Proceeds will be transferred automatically
which you purchased Fund shares.              from your Fund account to your bank account
                                              via ACH on or about the 15th day of each
                                              month ($100 minimum).
By Exchange
Shares of an AAdvantage Fund or Mileage Fund may be redeemed in exchange for another
American AAdvantage Fund-Platinum Class or American AAdvantage Mileage Fund-Platinum
Class, as applicable, if the shareholder has owned shares of the AAdvantage Fund or
Mileage Fund for at least 15 days. Send a written request to the address above or call
(800) 388-3344 to exchange shares.
</TABLE>

- --------------------------------------------------------------------------------

Prospectus                             23                  About Your Investment
<PAGE>   135

<TABLE>
<S>                             <C>
General Policies                If a shareholder's account balance in any Fund
                                falls below $2,500, the shareholder may be asked
                                to increase the balance. If the account balance
                                remains below $2,500 after 45 days, the Funds
                                reserve the right to close the account and send
                                the proceeds to the shareholder.
                                The following policies apply to instructions you
                                may provide to the Funds by telephone:
                                - The Funds, their officers, trustees,
                                directors, employees, or agents are not
                                  responsible for the authenticity of
                                  instructions provided by telephone, nor for
                                  any loss, liability, cost or expense incurred
                                  for acting on them.
                                - The Funds employ procedures reasonably
                                  designed to confirm that instructions
                                  communicated by telephone are genuine.
                                - Due to the volume of calls or other unusual
                                  circumstances, telephone redemptions may be
                                  difficult to implement during certain time
                                  periods.
                                The Funds reserve the right to:
                                - reject any order for the purchase of shares
                                and to limit or suspend, without prior notice,
                                  the offering of shares,
                                - modify or terminate the exchange privilege at
                                any time,
                                - limit the number of exchanges between Funds an
                                  investor may exercise, and
                                - seek reimbursement from you for any related
                                loss incurred if your payment for the purchase
                                  of Fund shares by check does not clear your
                                  bank.
                                Each financial institution is responsible for
                                the prompt transmission of purchase and
                                redemption orders of its clients. Financial
                                institutions may provide varying arrangements
                                for their clients with respect to the purchase
                                and redemption of Platinum Class shares. Shares
                                purchased through financial institutions may be
                                subject to transaction fees. Financial
                                institutions offering Platinum Class shares may
                                impose fees on investors for check writing
</TABLE>

- --------------------------------------------------------------------------------

About Your Investment                  24                             Prospectus
<PAGE>   136
<TABLE>
<S>                             <C>
                                privileges or, if approved by the Funds,
                                establish variations on minimum check amounts.
                                Some institutions may arrange for additional
                                privileges associated with Platinum Class
                                shares, such as a debit card, which may only be
                                available subject to certain conditions or
                                limitations.
</TABLE>

<TABLE>
<S>                             <C>
DISTRIBUTIONS AND TAXES         The Funds distribute most or all of their net
- --------------------------      earnings in the form of dividends from net
                                investment income and distributions of realized
                                net capital gains that are paid to shareholders
                                monthly on the first business day after the
                                month ends. Unless the account application
                                instructs otherwise, distributions will be
                                reinvested in additional Fund shares. Usually,
                                dividends (except those paid by the Municipal
                                Funds) and distributions of net realized gains
                                are taxable events.
                                The Municipal Funds designate most of their
                                distributions as "exempt-interest dividends,"
                                which may be excluded from gross income. If the
                                Funds earn taxable income from any of their
                                investments, that income will be distributed as
                                a taxable dividend. If the Funds invest in
                                private activity obligations, shareholders will
                                be required to treat a portion of the
                                exempt-interest dividends they receive as a "tax
                                preference item" in determining their liability
                                for federal alternative minimum tax ("AMT").
                                Some states exempt from income tax the interest
                                on their own obligations and on obligations of
                                governmental agencies and municipalities in the
                                state; accordingly, each year shareholders will
                                receive tax information on the Funds'
                                exempt-interest income by state.
                                This is only a summary of some of the important
                                income tax considerations that may affect Fund
                                shareholders. Shareholders should consult their
                                tax adviser regarding specific questions as to
                                the effect of federal, state or local income
                                taxes on an investment in the Funds.
</TABLE>

- --------------------------------------------------------------------------------

Prospectus                             25                  About Your Investment
<PAGE>   137

<TABLE>
<S>                             <C>
AADVANTAGE(R) MILES             The AAdvantage program offers the opportunity to
- --------------------            obtain free upgrades and travel awards on
                                American Airlines and AAdvantage airline
                                participants, as well as upgrades and discounts
                                on car rental and hotel accommodations. For more
                                information about the AAdvantage program, call
                                American Airlines at (800) 433-7300.
                                AAdvantage travel awards ("miles") will be
                                posted monthly in arrears to each shareholder's
                                AAdvantage account based on the shareholder's
                                average daily account balance during the
                                previous month. Miles are posted at an annual
                                rate of one mile per $10 maintained in each
                                Mileage Fund. Mileage is calculated on the
                                average daily balance and posted monthly. The
                                average daily balance is calculated by adding
                                each day's balance and dividing by the number of
                                days in the month. For example, the average
                                daily balance on a $50,000 account funded on the
                                16th day of a month having 30 days (and
                                maintained at that balance through the end of
                                the month) would be $25,000. Mileage received
                                for that month would be 208 miles. If the same
                                balance were maintained through the next month,
                                the average daily balance would be $50,000, and
                                the mileage would be 417 miles that month and
                                every month the $50,000 investment was
                                maintained in the Mileage Fund. These miles
                                appear on subsequent AAdvantage program
                                statements.
                                For trust accounts, AAdvantage miles will be
                                posted only in a trustee's individual name, and
                                not in the name of the trust account. Before
                                investing in the Mileage Funds, trustees of
                                trust accounts should consult their own legal
                                and tax advisers as to the tax effect of this
                                arrangement and whether this arrangement is
                                consistent with their legal duties as trustees.
                                American Airlines has informed the Mileage Funds
                                that in administering an AAdvantage member's
                                AAdvantage account, it shall not be required to
                                distinguish between AAdvantage miles accumulated
                                by the individual in his/her capacity as
</TABLE>

- --------------------------------------------------------------------------------

About Your Investment                  26                             Prospectus
<PAGE>   138
<TABLE>
<S>                             <C>
                                trustee to a trust account from AAdvantage miles
                                accumulated in an individual capacity from other
                                sources.
                                The Manager reserves the right to discontinue
                                the posting of AAdvantage miles or to change the
                                mileage calculation at any time upon notice to
                                shareholders. American Airlines may find it
                                necessary to change AAdvantage program rules,
                                regulations, travel awards and special offers at
                                any time. This means that American Airlines may
                                initiate changes impacting, for example,
                                participant affiliations, rules for earning
                                mileage credit, mileage levels and rules for the
                                use of travel awards, continued availability of
                                travel awards, blackout dates and limited
                                seating for travel awards, and the features of
                                special offers. American Airlines reserves the
                                right to end the AAdvantage program with six
                                months' notice. AAdvantage travel awards,
                                mileage accrual and special offers are subject
                                to governmental regulations.
</TABLE>

- --------------------------------------------------------------------------------

Prospectus                             27                  About Your Investment
<PAGE>   139

ADDITIONAL INFORMATION
- ----------------------

<TABLE>
<S>                             <C>
DISTRIBUTION OF                 The AAdvantage Funds and Mileage Funds have each
TRUST SHARES                    adopted a Distribution Plan for the Platinum
- ---------------                 Class (the "Plans") in accordance with Rule
                                12b-1 under the Investment Company Act of 1940
                                ("1940 Act"), which allow the Funds to pay
                                distribution and other fees for the sale of Fund
                                shares and for other services provided to
                                shareholders. In addition, the Mileage Funds'
                                Plan authorizes expenses incurred in connection
                                with participation in the AAdvantage program.
                                The Plans provide that each Platinum Class Fund
                                will pay 0.25% per annum of its average daily
                                net assets to the Manager (or another entity
                                approved by the applicable Board). Because these
                                fees are paid out of each Fund's assets on an
                                on-going basis, over time these fees will
                                increase the cost of your investment and may
                                cost you more than paying other types of sales
                                charges.
</TABLE>

<TABLE>
<S>                             <C>

MASTER-FEEDER STRUCTURE         The Funds operate under a master-feeder
- -----------------------         structure. This means that each Fund is a
                                "feeder" fund that invests all of its investable
                                assets in a "master" fund with the same
                                investment objective. The "master" fund
                                purchases securities for investment. The
                                master-feeder structure works as follows:

                                [Master-Feeder Structure Graph]

                                Each Fund can withdraw its investment in its
                                corresponding Portfolio at any time if the Board
                                determines that it is in the best interest of
                                the Fund and its shareholders to do so. If this
                                happens, the Fund's assets will be invested
                                according to the
</TABLE>

- --------------------------------------------------------------------------------

Additional Information                 28                             Prospectus
<PAGE>   140
                                investment policies and restrictions described
                                in this Prospectus.

FINANCIAL HIGHLIGHTS            The financial highlights tables are intended to
- --------------------            help you understand each Fund's financial
                                performance for the past five years (or, if
                                shorter, the period of the Fund's operations).
                                Certain information reflects financial results
                                for a single share of the Fund's Platinum Class.
                                The total returns in the table represent the
                                rate that an investor would have earned (or
                                lost) on an investment in the Fund (assuming
                                reinvestment of all dividends and
                                distributions). Each Fund's highlights were
                                audited by Ernst & Young LLP, independent
                                auditors. More financial information about the
                                Funds is found in their Annual Report, which you
                                may obtain upon request.

<TABLE>
<CAPTION>
                                                                             MONEY MARKET FUND
                                                  -----------------------------------------------------------------------
                                                                              PLATINUM CLASS
                                                  -----------------------------------------------------------------------
                                                   TWO MONTHS                                                 NOVEMBER 7,
                                                     ENDED               YEAR ENDED OCTOBER 31,                 1995 TO
                                                  DECEMBER 31,   --------------------------------------       OCTOBER 31,
     FOR A SHARE OUTSTANDING THROUGHOUT THE           1999         1999           1998           1997            1996
                    PERIOD:                       ------------   --------       --------       --------       -----------
<S>                                               <C>            <C>            <C>            <C>            <C>
Net asset value, beginning of period............    $   1.00     $   1.00       $   1.00       $   1.00        $   1.00
                                                    --------     --------       --------       --------        --------
Net investment income...........................        0.01(A)      0.04(A)        0.05(A)        0.05(A)         0.05(A)
Less dividends from net investment income.......       (0.01)       (0.04)         (0.05)         (0.05)          (0.05)
                                                    --------     --------       --------       --------        --------
Net asset value, end of period..................    $   1.00     $   1.00       $   1.00       $   1.00        $   1.00
                                                    ========     ========       ========       ========        ========
Total return (not annualized)...................        0.82%(C)     4.33%          4.89%          4.87%           4.78%(B,C)
                                                    ========     ========       ========       ========        ========
Ratios and supplemental data:
 Net assets, end of period (in thousands).......    $866,041     $841,653       $744,226       $494,413        $119,981
 Ratios to average net assets (annualized)
   Expenses.....................................        1.00%(A)     0.97%(A)       0.94%(A)       0.93%(A)        0.94%(A)
   Net investment income........................        4.87%(A)     4.24%(A)       4.78%(A)       4.80%(A)        4.63%(A)
</TABLE>

(A) The per share amounts and ratios reflect income and expenses assuming
    inclusion of the Fund's proportionate share of the income and expenses of
    its corresponding Portfolio.

(B) Total return for the Platinum Class for the period ended October 31, 1996
    reflects Institutional Class returns from November 1, 1995 through November
    6, 1995 and returns of the Platinum Class through October 31, 1996. Due to
    the different expense structures between the classes, total return would
    vary from the results shown had the Platinum Class been in operation for the
    entire year.

(C) Not annualized.

- --------------------------------------------------------------------------------

Prospectus                             29                 Additional Information
<PAGE>   141

<TABLE>
<CAPTION>
                                                                    MONEY MARKET MILEAGE FUND
                                            -------------------------------------------------------------------------
                                                                        PLATINUM CLASS(A)
                                            -------------------------------------------------------------------------
                                             TWO MONTHS                     YEAR ENDED                    JANUARY 29,
                                               ENDED                       OCTOBER 31,                        TO
                                            DECEMBER 31,       ------------------------------------       OCTOBER 31,
  FOR A SHARE OUTSTANDING THROUGHOUT THE        1999             1999          1998          1997            1996
                 PERIOD:                    ------------       --------       -------       -------       -----------
<S>                                         <C>                <C>            <C>           <C>           <C>
Net asset value, beginning of period......    $   1.00         $   1.00       $  1.00       $  1.00         $  1.00
                                              --------         --------       -------       -------         -------
Income from investment operations:
 Net investment income(B).................        0.01             0.04          0.05          0.05            0.03
 Dividends from net investment income.....       (0.01)           (0.04)        (0.05)        (0.05)          (0.03)
                                              --------         --------       -------       -------         -------
Net asset value, end of period............    $   1.00         $   1.00       $  1.00       $  1.00         $  1.00
                                              ========         ========       =======       =======         =======
Total return (not annualized).............        0.80%(C)         4.22%         4.74%         4.71%           4.78%(C)
                                              ========         ========       =======       =======         =======
Ratios and supplemental data:
 Net assets, end of period (in
   thousands).............................    $442,218         $342,192       $73,875       $49,184         $15,429
 Ratios to average net assets
   (annualized)(B):
   Expenses...............................        1.09%            1.09%         1.09%         1.09%           1.09%
   Net investment income..................        4.80%            4.17%         4.64%         4.64%           4.48%
 Decrease reflected in above expense ratio
   due to absorption of expenses by the
   Manager................................        0.01%               -          0.03%         0.05%           0.15%
</TABLE>

(A) The Money Market Mileage Fund-Platinum Class commenced active operations on
    January 29, 1996, and at that time the existing shares of the Fund were
    designated as Mileage Class shares.

(B) The per share amounts and ratios reflect income and expenses assuming
    inclusion of the Fund's proportionate share of the income and expenses of
    its corresponding Portfolio.

(C) Not annualized.

- --------------------------------------------------------------------------------

Additional Information                 30                             Prospectus
<PAGE>   142

<TABLE>
<CAPTION>
                                                                      MUNICIPAL MONEY MARKET FUND
                                                     --------------------------------------------------------------
                                                                             PLATINUM CLASS
                                                     --------------------------------------------------------------
                                                      TWO MONTHS                                        NOVEMBER 7,
                                                        ENDED            YEAR ENDED OCTOBER 31,           1995 TO
                                                     DECEMBER 31,    ------------------------------     OCTOBER 31,
                                                         1999         1999       1998        1997          1996
                                                     ------------    -------    -------     -------     -----------
<S>                                                  <C>             <C>        <C>         <C>         <C>
Net asset value, beginning of period...............     $  1.00      $  1.00    $  1.00     $  1.00       $  1.00
   Net investment income...........................        0.01(A)      0.02(A)    0.03(A)     0.03(A)       0.03(A)
   Less dividends from net investment income.......       (0.01)       (0.02)     (0.03)      (0.03)        (0.03)
                                                        -------      -------    -------     -------       -------
Net asset value, end of period.....................     $  1.00      $  1.00    $  1.00     $  1.00       $  1.00
                                                        -------      -------    -------     -------       -------
Total return (not annualized)......................        0.47%(C)     2.27%      2.75%       2.79%         2.88%(B,C)
                                                        -------      -------    -------     -------       -------
Ratios and supplemental data:
   Net assets, end of period (in thousands)........     $76,076      $81,118    $87,852     $63,883       $49,862
   Ratios to average net assets (annualized):
      Expenses.....................................        1.05%(A)     1.04%(A)    1.04%(A)    1.03%(A)      0.97%(A)
      Net investment income........................        2.77%(A)     2.24%(A)    2.69%(A)    2.75%(A)      2.72%(A)
                                                        -------      -------    -------     -------       -------
   Decrease reflected in above expense ratio due to
    absorption of expenses by the Manager..........        0.03%        0.01%      0.03%       0.01%         0.05%
</TABLE>

(A)The per share amounts and ratios reflect income and expenses assuming
   inclusion of the Fund's proportionate share of the income and expenses of its
   corresponding Portfolio.

(B)Total return for the Platinum Class for the period ended October 31, 1996
   reflects Institutional Class returns from November 1, 1995 through November
   6, 1995 and returns of the Platinum Class through October 31, 1996. Due to
   the different expense structures between the classes, total return would vary
   from the results shown had the Platinum Class been in operation for the
   entire year.

(C) Not annualized.

- --------------------------------------------------------------------------------

Additional Information                 28                             Prospectus
<PAGE>   143

<TABLE>
<CAPTION>
                                                                MUNICIPAL MONEY
                                                                MARKET MILEAGE
                                                                     FUND
                                                               -----------------
                                                               PLATINUM CLASS(B)
                                                               -----------------
                                                               TWO MONTHS ENDED
                                                                 DECEMBER 31,
                                                                     1999
       FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD:          -----------------
<S>                                                            <C>
Net asset value, beginning of period........................        $  1.00
                                                                    -------
Income from investment operations:
 Net investment income(A)...................................           0.01
 Dividends from net investment income.......................          (0.01)
                                                                    -------
Net asset value, end of period..............................        $  1.00
                                                                    =======
Total return (not annualized)...............................           0.45%(C)
                                                                    =======
Ratios and supplemental data:
 Net assets, end of period (in thousands)...................        $     1
 Ratios to average net assets (annualized)(A):
   Expenses.................................................           1.10%
   Net investment income....................................           2.74%
 Decrease reflected in above expense ratio due to absorption
   of expenses by the Manager...............................           0.17%
</TABLE>

(A)  The per share amounts and ratios reflect income and expenses assuming
     inclusion of the Fund's proportionate share of the income and expenses of
     the respective AMR Investment Services Portfolio.

(B)  The Platinum Class of the Municipal Money Market Mileage Fund commenced
     active operations on November 1, 1999 and at that time the existing shares
     of the Fund were designated as Mileage Class shares.

(C)  Not annualized.

- --------------------------------------------------------------------------------

Prospectus                             29                 Additional Information
<PAGE>   144

<TABLE>
<CAPTION>
                                                                   U.S. GOVERNMENT MONEY MARKET FUND
                                                ------------------------------------------------------------------------
                                                                             PLATINUM CLASS
                                                ------------------------------------------------------------------------
                                                 TWO MONTHS                                                  NOVEMBER 7,
                                                   ENDED                 YEAR ENDED OCTOBER 31,                1995 TO
                                                DECEMBER 31,       -----------------------------------       OCTOBER 31,
    FOR A SHARE OUTSTANDING THROUGHOUT THE          1999            1998         1997(B)                        1996
                   PERIOD:                      ------------       -------       -------                     -----------
<S>                                             <C>                <C>           <C>           <C>           <C>
Net asset value, beginning of period..........    $  1.00          $  1.00       $  1.00       $  1.00         $  1.00
                                                  -------          -------       -------       -------         -------
Net investment income.........................       0.01(A)          0.04(A)       0.05(A)       0.05(A)         0.04(A)
Less dividends from net investment income.....      (0.01)           (0.04)        (0.05)        (0.05)          (0.04)
                                                  -------          -------       -------       -------         -------
Net asset value, end of period................    $  1.00          $  1.00       $  1.00       $  1.00         $  1.00
                                                  =======          =======       =======       =======         =======
Total return (not annualized).................       0.80%(E)         4.09%         4.71%         4.61%           4.58%(C,E)
                                                  =======          =======       =======       =======         =======
Ratios and supplemental data:
 Net assets, end of period (in thousands).....    $78,585          $84,385       $78,412       $68,439         $52,153
 Ratios to average net assets (annualized)(D)
   Expenses...................................       1.02%(A)         1.01%(A)      1.01%(A)      0.99%(A)        1.00%(A)
   Net investment income......................       4.77%(A)         4.01%(A)      4.62%(A)      4.53%(A)        4.35%(A)
</TABLE>

(A) The per share amounts and ratios reflect income and expenses assuming
    inclusion of the Fund's proportionate share of the income and expenses of
    its corresponding Portfolio.

(B) Prior to March 1, 1997, the U.S. Government Money Market Fund was known as
    the U.S. Treasury Money Market Fund and operated under different investment
    policies.

(C) Total return for the Platinum Class for the period ended October 31, 1996
    reflects Institutional Class returns from November 1, 1995 through November
    6, 1995 and returns of the Platinum Class through October 31, 1996. Due to
    the different expense structures between the classes, total return would
    vary from the results shown had the Platinum Class been in operation for the
    entire year.

(D) Operating results exclude fees waived by the Manager during the year ended
    October 31, 1998. Had the Platinum Class of the Fund paid such fees, the
    ratio of expenses and net investment income to average net assets would have
    been 1.02% and 4.62%, respectively.

(E) Not annualized.

- --------------------------------------------------------------------------------

Additional Information                 30                             Prospectus
<PAGE>   145

<TABLE>
<CAPTION>
                                                                U.S. GOVERNMENT
                                                                 MONEY MARKET
                                                                 MILEAGE FUND
                                                               -----------------
                                                               PLATINUM CLASS(B)
                                                               -----------------
                                                               TWO MONTHS ENDED
                                                                 DECEMBER 31,
                                                                     1999
       FOR A SHARE OUTSTANDING THROUGHOUT THE PERIOD:          -----------------
<S>                                                            <C>
Net asset value, beginning of period........................        $  1.00
                                                                    -------
Income from investment operations:
 Net investment income(A)...................................           0.01
 Dividends from net investment income.......................          (0.01)
                                                                    -------
Net asset value, end of period..............................        $  1.00
                                                                    =======
Total return (not annualized)...............................           0.80%(C)
                                                                    =======
Ratios and supplemental data:
 Net assets, end of period (in thousands)...................        $     1
 Ratios to average net assets (annualized)(A):
   Expenses.................................................           1.10%
   Net investment income....................................           4.69%
 Decrease reflected in above expense ratio due to absorption
   of expenses by the Manager...............................           0.20%
</TABLE>

(A)  The per share amounts and ratios reflect income and expenses assuming
     inclusion of each Fund's proportionate share of the income and expenses of
     the respective AMR Investment Services Portfolio.

(B)  The Platinum Class of the U.S. Government Money Market Mileage Fund
     commenced active operations on November 1, 1999 and at that time the
     existing shares of the Fund were designated as Mileage Class shares.

(C)  Not annualized.

- --------------------------------------------------------------------------------

Prospectus                             31                 Additional Information
<PAGE>   146


ADDITIONAL INFORMATION
- --------------------------------------------------------------------------------

ADDITIONAL INFORMATION ABOUT THE FUNDS IS FOUND IN THE DOCUMENTS LISTED BELOW.
REQUEST A FREE COPY OF THESE DOCUMENTS BY CALLING (800) 967-9009.


ANNUAL REPORT/SEMI-ANNUAL REPORT

The Fund's Annual and Semi-Annual Reports list the Fund's actual investments as
of the report's date. They also include a discussion by the Manager of market
conditions and investment strategies that significantly affected the Fund's
performance. The report of the Fund's independent auditors is included in the
Annual Report.

STATEMENT OF ADDITIONAL INFORMATION

The SAI contains more details about the Fund and its investment policies. The
SAI is incorporated in this Prospectus by reference (it is legally part of this
Prospectus). A current SAI is on file with the Securities and Exchange
Commission (SEC).

TO OBTAIN MORE INFORMATION ABOUT THE FUNDS OR TO REQUEST A COPY OF THE DOCUMENTS
LISTED ABOVE:


<TABLE>
<S>                                               <C>
            BY TELEPHONE:                                        BY MAIL:
         Call (800) 967-9009                            American AAdvantage Funds
                                                         P.O. Box 619003, MD5645
                                                       DFW Airport, TX 75261-9003


              BY E-MAIL:                                      ON THE INTERNET:
[email protected]              Visit our website at www.aafunds.com
                                                  Visit the SEC website at www.sec.gov
</TABLE>


Copies of these documents may also be obtained from the SEC Public Reference
Room by mailing a request, including a duplicating fee to: SEC's Public
Reference Section, 450 5th Street NW, Washington, D.C. 20549-6009. The Public
Reference Room can be reached at (202) 942-8090.

<TABLE>
<S>                                               <C>
              AMERICAN                                      AMERICAN AADVANTAGE
         AADVANTAGE FUNDS(R)                                  MILEAGE FUNDS(R)

       SEC File Number 811-4984                           SEC File Number 811-9018
</TABLE>

American Airlines is not responsible for investments made in the American
AAdvantage Funds. American AAdvantage Funds and American AAdvantage Mileage
Funds are registered service marks of AMR Corporation. Platinum Class, American
AAdvantage Money Market Fund, American AAdvantage Municipal Money Market Fund,
American AAdvantage U.S. Government Money Market Fund, American AAdvantage Money
Market Mileage Fund, American AAdvantage Municipal Money Market Mileage Fund and
American AAdvantage U.S. Government Money Market Mileage Fund are service marks
of AMR Investment Services, Inc.

<PAGE>   147



                       STATEMENT OF ADDITIONAL INFORMATION

                          AMERICAN AADVANTAGE FUNDS(R)

                               -- AMR CLASS(SM) --
                            -- INSTITUTIONAL CLASS --
                            -- PLANAHEAD CLASS(R) --

                                  MARCH 1, 2000

         The American AAdvantage Balanced Fund(sm) (the "Balanced Fund"),
American AAdvantage Large Cap Value Fund(sm), formerly known as the American
AAdvantage Growth and Income Fund prior to March 1, 1999 and as the American
AAdvantage Equity Fund prior to August 1, 1994 (the "Large Cap Value Fund"),
American AAdvantage International Equity Fund(sm) (the "International Equity
Fund"), American AAdvantage Small Cap Value Fund(sm) (the "Small Cap Fund"),
American AAdvantage S&P 500 Index Fund (the "S&P 500 Index Fund"), American
AAdvantage Intermediate Bond Fund(sm) (the "Intermediate Bond Fund"), American
AAdvantage Short-Term Bond Fund(sm), formerly known as the American AAdvantage
Limited-Term Income Fund prior to March 1, 1998 (the "Short-Term Bond Fund"),
American AAdvantage Money Market Fund(sm) (the "Money Market Fund"), American
AAdvantage Municipal Money Market Fund(sm) (the "Municipal Money Market Fund")
and American AAdvantage U.S. Government Money Market Fund(sm), formerly known as
the American AAdvantage U.S. Treasury Money Market Fund prior to March 1, 1997
(the "U.S. Government Money Market Fund"), (individually, a "Fund" and
collectively, the "Funds") are ten separate investment portfolios of the
American AAdvantage Funds (the "Trust"), a no-load, open-end, diversified
management investment company organized as a Massachusetts business trust on
January 16, 1987. Each Fund constitutes a separate investment portfolio with a
distinct investment objective, and distinct purpose and strategy. Each Fund is
comprised of multiple classes of shares designed to meet the needs of different
groups of investors. This Statement of Additional Information ("SAI") relates to
the AMR, Institutional and PlanAhead Classes of the Trust.

         Each Fund, except the S&P 500 Index Fund, seeks its investment
objective by investing all of its investable assets in a corresponding portfolio
of the AMR Investment Services Trust ("AMR Trust") that has a similar name and
an identical investment objective to the investing Fund. The S&P 500 Index Fund
invests all of its investable assets in the State Street Equity 500 Index
Portfolio ("Equity 500 Index Portfolio"), which has an identical investment
objective. Prior to March 1, 2000, the S&P 500 Index Fund invested all of its
investable assets in the BT Equity 500 Index Portfolio, a separate investment
company managed by Bankers Trust Company ("BT"). The Equity 500 Index Portfolio
and the portfolios of the AMR Trust are referred to herein individually as a
"Portfolio" and, collectively, the "Portfolios." Each Portfolio has an
investment objective identical to the investing Fund. The AMR Trust is a
separate investment company managed by AMR Investment Services, Inc. (the
"Manager"). The Equity 500 Index Portfolio is a separate investment company
managed by State Street Bank and Trust Company ("State Street"), through its
State Street Global Advisors division.

         This SAI should be read in conjunction with an AMR Class, an
Institutional Class or a PlanAhead Class prospectus, dated March 1, 2000,
(individually, a "Prospectus"), copies of which may be obtained without charge
by calling (800) 388-3344 for a PlanAhead or Institutional Class Prospectus or
(817) 967-3509 for an AMR Class Prospectus.

         This SAI is not a prospectus and is authorized for distribution to
prospective investors only if preceded or accompanied by a current Prospectus.



<PAGE>   148


                                TABLE OF CONTENTS

<TABLE>
<S>                                                                          <C>
Non-Principal Investment Strategies and Risks.................................2

Investment Restrictions.......................................................3

Temporary Defensive Position..................................................6

Portfolio Turnover............................................................6

Trustees and Officers of the Trust and the AMR Trust..........................6

Trustees and Officers of the Equity 500 Index Portfolio.......................8

Control Persons and 5% Shareholders...........................................9

Investment Advisory Agreements...............................................12

Management, Administrative Services and Distribution Fees....................13

Other Service Providers......................................................14

Portfolio Securities Transactions............................................15

Redemptions in Kind..........................................................17

Net Asset Value..............................................................17

Tax Information..............................................................17

Yield and Total Return Quotations............................................20

Description of the Trust.....................................................23

Other Information............................................................24

Financial Statements.........................................................37

Appendix A...................................................................38
</TABLE>
<PAGE>   149

                  NON-PRINCIPAL INVESTMENT STRATEGIES AND RISKS

         In addition to the investment strategies described in the Prospectuses,
the Balanced Fund, the Large Cap Value Fund, the International Equity Fund, and
the Small Cap Value Fund may:

         Invest up to 20% of total assets in debt securities that are investment
         grade at the time of purchase, including obligations of the U.S.
         Government, its agencies and instrumentalities, corporate debt
         securities, mortgage-backed securities, asset-backed securities,
         master-demand notes, Yankeedollar and Eurodollar bank certificates of
         deposit, time deposits, bankers' acceptances, commercial paper and
         other notes, and other debt securities. Investment grade securities
         include securities issued or guaranteed by the U.S. Government, its
         agencies and instrumentalities, as well as securities rated in one of
         the four highest rating categories by all rating organizations rating
         that security (such as Standard & Poor's Corporation or Moody's
         Investors Service, Inc.). Obligations rated in the fourth highest
         rating category are limited to 25% of each of these Funds' debt
         allocations. The International Equity Fund may invest up to 20% of its
         total assets in non-U.S. debt securities that are rated at the time of
         purchase in one of the three highest rating categories by any rating
         organization or, if unrated, are deemed to be of comparable quality by
         the applicable investment adviser and traded publicly on a world
         market. These Funds, at the discretion of the investment advisers, may
         retain a debt security that has been downgraded below the initial
         investment criteria.

         Each Fund may (except where indicated otherwise):

         1. Engage in dollar rolls or purchase or sell securities on a
         when-issued or forward commitment basis. (The S&P 500 Index Fund will
         not engage in dollar rolls or purchase or sell securities on a forward
         commitment basis.) The purchase or sale of when-issued securities
         enables an investor to hedge against anticipated changes in interest
         rates and prices by locking in an attractive price or yield. The price
         of when-issued securities is fixed at the time the commitment to
         purchase or sell is made, but delivery and payment for the when-issued
         securities take place at a later date, normally one to two months after
         the date of purchase. During the period between purchase and
         settlement, no payment is made by the purchaser to the issuer and no
         interest accrues to the purchaser. Such transactions therefore involve
         a risk of loss if the value of the security to be purchased declines
         prior to the settlement date or if the value of the security to be sold
         increases prior to the settlement date. A sale of a when-issued
         security also involves the risk that the other party will be unable to
         settle the transaction. Dollar rolls are a type of forward commitment
         transaction. Purchases and sales of securities on a forward commitment
         basis involve a commitment to purchase or sell securities with payment
         and delivery to take place at some future date, normally one to two
         months after the date of the transaction. As with when-issued
         securities, these transactions involve certain risks, but they also
         enable an investor to hedge against anticipated


                                       2
<PAGE>   150


         changes in interest rates and prices. Forward commitment transactions
         are executed for existing obligations, whereas in a when-issued
         transaction, the obligations have not yet been issued. When purchasing
         securities on a when-issued or forward commitment basis, a segregated
         account of liquid assets at least equal to the value of purchase
         commitments for such securities will be maintained until the settlement
         date.

         2. Invest in other investment companies (including affiliated
         investment companies) to the extent permitted by the Investment Company
         Act of 1940 ("1940 Act") or exemptive relief granted by the Securities
         and Exchange Commission ("SEC").

         3. Loan securities to broker-dealers or other institutional investors.
         Securities loans will not be made if, as a result, the aggregate amount
         of all outstanding securities loans by a Portfolio exceeds 33 1/3% of
         its total assets (including the market value of collateral received).
         For purposes of complying with a Portfolio's investment policies and
         restrictions, collateral received in connection with securities loans
         is deemed an asset of the Portfolio to the extent required by law. The
         Manager receives compensation for administrative and oversight
         functions with respect to securities lending. The amount of such
         compensation depends on the income generated by the loan of the
         securities. A Portfolio continues to receive interest on the securities
         loaned and simultaneously earns either interest on the investment of
         the cash collateral or fee income if the loan is otherwise
         collateralized.

         4. Enter into repurchase agreements. A repurchase agreement is an
         agreement under which securities are acquired by a Portfolio from a
         securities dealer or bank subject to resale at an agreed upon price on
         a later date. The acquiring Portfolio bears a risk of loss in the event
         that the other party to a repurchase agreement defaults on its
         obligations and the Portfolio is delayed or prevented from exercising
         its rights to dispose of the collateral securities. However, the
         investment advisers or the Manager attempt to minimize this risk by
         entering into repurchase agreements only with financial institutions
         that are deemed to be of good financial standing.

         5. Purchase securities in private placement offerings made in reliance
         on the "private placement" exemption from registration afforded by
         Section 4(2) of the Securities Act of 1933 ("1933 Act"), and resold to
         qualified institutional buyers under Rule 144A under the 1933 Act
         ("Section 4(2) securities"). The Money Market Portfolios will not
         invest more than 10% (and the other Funds' respective Portfolios will
         not invest more than 15%) of their respective net assets in Section
         4(2) securities and illiquid securities unless the applicable
         investment adviser determines, by continuous reference to the
         appropriate trading markets and pursuant to guidelines approved by the
         AMR Trust's Board of Trustees ("AMR Trust Board") or the Equity 500
         Index Portfolio Board, that any Section 4(2) securities held by such
         Portfolio in excess of this level are at all times liquid.

                             INVESTMENT RESTRICTIONS

         Each Fund has the following fundamental investment policy that enables
it to invest in its corresponding Portfolio:

         Notwithstanding any other limitation, the Fund may invest all of its
         investable assets in an open-end management investment company with
         substantially the same investment objectives, policies and limitations
         as the Fund. For this purpose, "all of the Fund's investable assets"
         means that the only investment securities that will be held by the Fund
         will be the Fund's interest in the investment company.

         All other fundamental investment policies and the non-fundamental
policies of each Fund and its corresponding Portfolio are identical, except for
the S&P 500 Index Fund and the Equity 500 Index Portfolio. Therefore, although
the following discusses the investment policies of each Portfolio and the AMR
Trust Board, it applies equally to each Fund, except for the S&P 500 Index Fund,
and the Trust's Board of Trustees ("Board").

PORTFOLIOS OF THE AMR TRUST

         In addition to the investment limitations noted in the Prospectuses,
the following nine restrictions have been adopted by each Portfolio of the AMR
Trust, and may be changed with respect to any such Portfolio only by the
majority vote of that Portfolio's outstanding interests. "Majority of the
outstanding voting securities" under the 1940 Act, as amended, and as used
herein means, with respect to the Portfolio, the lesser of (a) 67% of the
interests of the Portfolio present at the meeting if the holders of more than
50% of the interests are present and


                                       3
<PAGE>   151


represented at the interest holders' meeting or (b) more than 50% of the
interests of the Portfolio. Whenever a Fund is requested to vote on a change in
the investment restrictions of its corresponding Portfolio, that Fund will hold
a meeting of its shareholders and will cast its votes as instructed by its
shareholders. The percentage of a Fund's votes representing that Fund's
shareholders not voting will be voted by the Board in the same proportion as
those Fund shareholders who do, in fact, vote.

No Portfolio of the AMR Trust may:

         1. Purchase or sell real estate or real estate limited partnership
         interests, provided, however, that the Portfolio may invest in
         securities secured by real estate or interests therein or issued by
         companies which invest in real estate or interests therein when
         consistent with the other policies and limitations described in the
         Prospectuses.

         2. Purchase or sell commodities (including direct interests and/or
         leases in oil, gas or minerals) or commodities contracts, except with
         respect to forward foreign currency exchange contracts, foreign
         currency futures contracts and when-issued securities when consistent
         with the other policies and limitations described in the Prospectuses.
         In addition, the Balanced Portfolio, Large Cap Value Portfolio, Small
         Cap Value Portfolio, and International Equity Portfolio may purchase or
         sell futures contracts and options on futures contracts as a method for
         keeping assets readily convertible to cash if needed to meet
         shareholder redemptions or other needs while maintaining exposure to
         the stock market.

         3. Engage in the business of underwriting securities issued by others,
         except to the extent that, in connection with the disposition of
         securities, the Portfolio may be deemed an underwriter under federal
         securities law.

         4. Make loans to any person or firm, provided, however, that the making
         of a loan shall not be construed to include (i) the acquisition for
         investment of bonds, debentures, notes or other evidences of
         indebtedness of any corporation or government which are publicly
         distributed or (ii) the entry into repurchase agreements and further
         provided, however, that each Portfolio may lend its portfolio
         securities to broker-dealers or other institutional investors in
         accordance with the guidelines stated in the Prospectus.

         5. Purchase from or sell portfolio securities to its officers, Trustees
         or other "interested persons" of the Trust, as defined in the 1940 Act,
         including its investment advisers and their affiliates, except as
         permitted by the 1940 Act and exemptive rules or orders thereunder.

         6. Issue senior securities except that the Portfolio may engage in
         when-issued securities and forward commitment transactions and the
         International Equity Portfolio may engage in currency futures and
         forward currency contracts.

         7. Borrow money, except from banks or through reverse repurchase
         agreements for temporary purposes. In addition, the Balanced Portfolio,
         Large Cap Value Portfolio, Small Cap Value Portfolio, and International
         Equity Portfolio may borrow money from the Manager or any of its
         affiliates for temporary purposes. The aggregate amount of borrowing
         for each Portfolio is not to exceed 10% of the value of the Portfolio's
         assets at the time of borrowing. Although not a fundamental policy, the
         Portfolios intend to repay any money borrowed before any additional
         portfolio securities are purchased. See "Other Information" for a
         further description regarding reverse repurchase agreements.

         8. Invest more than 5% of its total assets (taken at market value) in
         securities of any one issuer, other than obligations issued by the U.S.
         Government, its agencies and instrumentalities, or purchase more than
         10% of the voting securities of any one issuer, with respect to 75% of
         the Portfolio's total assets; or

         9. Invest more than 25% of its total assets in the securities of
         companies primarily engaged in any one industry, provided that: (i)
         this limitation does not apply to obligations issued or guaranteed by
         the U.S. Government, its agencies and instrumentalities; (ii)
         municipalities and their agencies and authorities are not deemed to be
         industries; and (iii) financial service companies are classified
         according to the end users of their services (for example, automobile
         finance, bank finance, and diversified finance will be considered
         separate industries).


                                       4
<PAGE>   152


         The above percentage limits are based upon asset values at the time of
the applicable transaction; accordingly, a subsequent change in asset values
will not affect a transaction that was in compliance with the investment
restrictions at the time such transaction was effected.

         The following non-fundamental investment restrictions may be changed
with respect to each Fund by a vote of a majority of the Board or, with respect
to the Portfolio, by a vote of a majority of the AMR Trust Board. The Portfolio
may not:

         1. Invest more than 15% of its net assets in illiquid  securities,
         including time deposits and repurchase agreements that mature in more
         than seven days; or

         2. Purchase securities on margin, effect short sales (except that a
         Portfolio may obtain such short term credits as may be necessary for
         the clearance of purchases or sales of securities) or purchase or sell
         call options or engage in the writing of such options.

         All Portfolios of the AMR Trust may invest up to 10% of their total
assets in the securities of other investment companies to the extent permitted
by law; however, pursuant to exemptive relief granted by the SEC, a Portfolio
may invest up to 25% of its total assets in the aggregate of the Money Market
Portfolio, Municipal Money Market Portfolio, and U.S. Government Money Market
Portfolio. A Portfolio of the AMR Trust may incur duplicate advisory or
management fees when investing in another mutual fund.

EQUITY 500 INDEX PORTFOLIO AND S&P 500 INDEX FUND

         The following investment restrictions are "fundamental policies" of the
Equity 500 Index Portfolio and the S&P 500 Index Fund, and may be changed with
respect to the Portfolio or the Fund only by the majority vote of the
Portfolio's or Fund's outstanding interests or shares, respectively, as defined
above. Except where noted otherwise, the fundamental investment restrictions of
the Equity 500 Index Portfolio and the S&P 500 Index Fund are substantially the
same. Whenever the S&P 500 Index Fund is requested to vote on a change in the
fundamental policy of the Portfolio, the Fund will hold a meeting of its
shareholders and will cast its votes as instructed by its shareholders. The
percentage of the Fund's votes representing Fund shareholders not voting will be
voted by the Board in the same proportion as the Fund shareholders who do, in
fact, vote.

The Equity 500 Index Portfolio and the S&P 500 Index Fund may not:

         1. Borrow more than 33 1/3% of the value of its total assets less all
         liabilities and indebtedness (other than such borrowings). The S&P 500
         Index Fund may borrow money in an amount not more than 1/3 of the
         current value of its net assets as a temporary measure for
         extraordinary or emergency purposes and enter into reverse repurchase
         agreements or dollar roll transactions, and it may pledge, mortgage or
         hypothecate not more than 1/3 of such assets to secure such borrowings
         (it is intended that money would be borrowed only from banks and only
         either to accommodate requests for the withdrawal of beneficial
         interests (redemption of shares) while effecting an orderly liquidation
         of portfolio securities or to maintain liquidity in the event of an
         unanticipated failure to complete a portfolio security transaction or
         other similar situations) or reverse repurchase agreements, provided
         that collateral arrangements with respect to options and futures,
         including deposits of initial deposit and variation margin, are not
         considered a pledge of assets for purposes of this restriction and
         except that assets may be pledged to secure letters of credit solely
         for the purpose of participating in a captive insurance company
         sponsored by the Investment Company Institute.

         2. Underwrite securities issued by other persons except to the extent
         that, in connection with the disposition of its portfolio investments,
         it may be deemed to be an underwriter under certain federal securities
         laws.

         3. Purchase or sell real estate, although it may purchase securities of
         issuers which deal in real estate, securities which are secured by
         interests in real estate, and securities which represent interests in
         real estate, and it may acquire and dispose of real estate or interests
         in real estate acquired through the exercise of its rights as a holder
         of debt obligations secured by real estate or interests therein. The
         S&P 500 Index Fund may not purchase or sell interests in oil, gas or
         mineral leases.

         4. Purchase or sell commodities or commodity contracts, except that it
         may purchase and sell financial futures contracts and options and may
         enter into foreign exchange contracts and other financial transactions
         not involving the direct purchase or sale of physical commodities.


                                       5
<PAGE>   153


         5. Make loans, except by purchase of debt obligations in which the
         Portfolio may invest consistent with its investment policies, by
         entering into repurchase agreements, or by lending its portfolio
         securities. The S&P 500 Index Fund may not make loans to other persons
         except: (a) through the lending of the Fund's portfolio securities and
         provided that any such loans not exceed 30% of the Fund's net assets
         (taken at market value); (b) through the use of repurchase agreements
         or the purchase of short-term obligations; or (c) by purchasing a
         portion of an issue of debt securities of types distributed publicly or
         privately.

         6. With respect to 75% of its total assets, invest in the securities of
         any issuer if, immediately after such investment, more than 5% of the
         total assets of the Portfolio (taken at current value) would be
         invested in the securities of such issuer; provided that this
         limitation does not apply to obligations issued or guaranteed as to
         interest or principal by the U.S. government or its agencies or
         instrumentalities.

         7. With respect to 75% of its total assets, acquire more than 10% of
         the outstanding voting securities of any issuer.

         8. Purchase securities (other than securities of the U.S. government,
         its agencies or instrumentalities) if, as a result of such purchase,
         more than 25% of the Portfolio's total assets would be invested in any
         one industry.

         9. Issue any class of securities that is senior to the Portfolio's
         beneficial interests, to the extent prohibited by the Investment
         Company Act of 1940, as amended, provided that, for the S&P 500 Index
         Fund, collateral arrangements with respect to options and futures,
         including deposits of initial deposit and variation margin, are not
         considered to be the issuance of a senior security for purposes of this
         restriction.

         In addition, it is contrary to the Portfolio's present policy, which
may be changed without interestholder approval, to invest in (a) securities
which are not readily marketable, (b) securities restricted as to resale
(excluding securities determined by the Trustees of the Trust (or the person
designated by the Trustees of the Trust to make such determinations) to be
readily marketable), and (c) repurchase agreements maturing in more than seven
days, if, as a result, more than 15% of the Portfolio's net assets (taken at
current value) would be invested in securities described in (a), (b) and (c)
above.

         All percentage limitations on investments will apply at the time of the
making of an investment and shall not be considered violated unless an excess or
deficiency occurs or exists immediately after and as a result of such
investment. Except for the investment restrictions listed above as fundamental
or to the extent designated as such in the Prospectus with respect to the
Portfolio, the other investment policies described in this SAI or in the
Prospectus are not fundamental and may be changed by approval of the Trustees.

                          TEMPORARY DEFENSIVE POSITION

         While assuming a temporary defensive position, a Fund may invest in
cash or cash equivalent short-term investment grade obligations, including:
obligations of the U.S. Government, its agencies and instrumentalities;
corporate debt securities, such as commercial paper, master demand notes, loan
participation interests, medium-term notes and funding agreements; Yankeedollar
and Eurodollar bank certificates of deposit, time deposits, and banker's
acceptances; asset-backed securities; and repurchase agreements involving the
foregoing obligations.

                               PORTFOLIO TURNOVER

         Following is a list of the Funds' corresponding Portfolios exhibiting
significant variation in the portfolio turnover rate for the fiscal years ended
October 31, 1998 and 1999.

<TABLE>
<CAPTION>
               PORTFOLIO                    1998     1999
               ---------                    ----     ----
               <S>                          <C>      <C>
               Short-Term Bond                74%     115%
               Intermediate Bond             181%     123%
</TABLE>

         High portfolio turnover can increase a Fund's transaction costs and
generate additional capital gains or losses. The portfolio turnover rate for the
Short-Term Bond and Intermediate Bond Funds may continue to exceed 100% due to
the active style in which the portfolios are managed in response to changes in
market conditions.


                                       6
<PAGE>   154


              TRUSTEES AND OFFICERS OF THE TRUST AND THE AMR TRUST

         The Board provides broad supervision over the Trust's affairs. The
Manager is responsible for the management of Trust assets, and the Trust's
officers are responsible for the Trust's operations. The Trustees and officers
of the Trust and AMR Trust are listed below, together with their principal
occupations during the past five years. Unless otherwise indicated, the address
of each person listed below is 4333 Amon Carter Boulevard, MD 5645, Fort Worth,
Texas 76155.

<TABLE>
<CAPTION>
                                      POSITION WITH
NAME, AGE AND ADDRESS                 EACH TRUST        PRINCIPAL OCCUPATION DURING PAST 5 YEARS
- ---------------------                 ----------        ----------------------------------------
<S>                                   <C>               <C>
William F. Quinn* (52)                Trustee and       President, AMR Investment Services, Inc. (1986-Present); Chairman,
                                      President         American Airlines Employees Federal Credit Union (1989-Present);
                                                        Director, Crescent Real Estate Equities, Inc. (1994-Present); Vice Chairman,
                                                        United Way of Tarrant County, Texas (1988-Present); Director, Southern
                                                        Methodist University Cox School of Business (1999-Present); Director,
                                                        Southern Methodist University Endowment Fund Advisory Board (1996-Present);
                                                        Trustee, American AAdvantage Mileage Funds (1995-Present); Trustee, American
                                                        Select Funds (1999-Present).

Alan D. Feld (63)                     Trustee           Partner, Akin, Gump, Strauss, Hauer & Feld, LLP (1960-Present)#; Director,
1700 Pacific Avenue                                     Clear Channel Communications (1984-Present); Director, CenterPoint
Suite 4100                                              Properties, Inc. (1994-Present); Trustee, American AAdvantage Mileage Funds
Dallas, Texas  75201                                    (1996-Present); Trustee, American Select Funds (1999-Present).

Ben J. Fortson (67)                   Trustee           President and CEO, Fortson Oil Company (1958-Present); Director,
301 Commerce Street                                     Kimbell Art Foundation  (1964-Present); Director, Burnett Foundation
Suite 3301                                              (1987-Present); Honorary Trustee, Texas Christian University (1986-Present);
Fort Worth, Texas  76102                                Trustee, American Aadvantage Mileage Funds (1996-Present); Trustee, American
                                                        Select Funds (1999-Present).

John S. Justin (83)                   Trustee           Chairman (1969-Present), Chief Executive Officer (1969-1999), Justin
2821 West Seventh Street                                Industries, Inc. (a diversified  holding company); Executive Board
Fort Worth, Texas  76107                                Member, Blue Cross/Blue Shield of Texas (1985-Present); Board Member,
                                                        Zale Lipshy Hospital (1993-Present); Trustee, Texas Christian University
                                                        (1980-Present); Director and Executive Board Member, Moncrief Radiation
                                                        Center (1985-Present); Trustee, American AAdvantage Mileage Funds
                                                        (1995-Present); Trustee, American Select Funds (1999-Present).

Stephen D. O'Sullivan* (64)           Trustee           Consultant (1994-Present); Trustee, American AAdvantage Mileage Funds
                                                        (1995-Present); Trustee, American Select Funds (1999-Present).

Roger T. Staubach (58)                Trustee           Chairman  of the Board and Chief Executive Officer  of The Staubach
15601 Dallas Parkway                                    Company (a commercial real estate company) (1982-Present); Director,
Suite 400                                               Brinker International (1993-Present); Trustee, Institute for Aerobics
Dallas, Texas 75001                                     Research;  Member, Executive Council, Daytop/Dallas; Member, National
                                                        Board of Governors, United Way of America; Board of Directors, PowerUP;
                                                        former quarterback of the Dallas Cowboys professional football team;
                                                        Trustee, American AAdvantage Mileage Funds (1995-Present); Trustee, American
                                                        Select Funds (1999-Present).

Kneeland Youngblood (44)              Trustee           Managing Partner, Pharos Capital Group, LLC (a private equity firm)
100 Crescent Court                                      (1998-Present); Director, L&B RealtyAdvisors (1998-2000); Trustee,
Suite 1740                                              Teachers Retirement System of Texas (1993-1999); Director, United
Dallas, Texas 75201                                     States Enrichment Corporation (1993-1998), Director, Just For the Kids
                                                        (1995-Present); Director, Starwood Financial Trust (1998-Present); Member,
                                                        Council on Foreign Relations (1995-Present); Trustee, American AAdvantage
                                                        Mileage Funds (1996-Present); Trustee, American Select Funds (1999-Present).

Nancy A. Eckl (37)                    Vice              Vice President, Trust Investments, AMR Investment Services, Inc.
                                      President         (1990-Present).
</TABLE>


                                       7
<PAGE>   155




<TABLE>
<CAPTION>
                                       POSITION WITH
NAME, AGE AND ADDRESS                  EACH TRUST         PRINCIPAL OCCUPATION DURING PAST 5 YEARS
- ---------------------                  ----------         ----------------------------------------
<S>                                    <C>                <C>
Michael W. Fields (46)                 Vice               Vice President, Fixed Income Investments, AMR Investment Services,
                                       President          Inc. (1988-Present).

Barry Y. Greenberg (36)                Vice President     Vice President, Legal and Compliance, AMR Investment Services, Inc.
                                       and Assistant      (1995-Present); Attorney, Securities and Exchange Commission
                                       Secretary          (1988-1995).

Rebecca L. Harris (33)                 Treasurer          Vice President, Finance (1995-Present), Controller (1991-1995), AMR
                                                          Investment Services, Inc.

John B. Roberson (41)                  Vice               Vice President, Sales and Marketing, AMR Investment Services, Inc.
                                       President          (1991-Present).

Robert J. Zutz (47)                    Secretary          Partner, Kirkpatrick & Lockhart LLP (law firm)
1800 Massachusetts Ave. NW
2nd Floor
Washington, D.C. 20036
</TABLE>


*  Messrs. Quinn and O'Sullivan are deemed to be "interested persons" of the
   Trust and AMR Trust as defined by the 1940 Act.

#  The law firm of Akin, Gump, Strauss, Hauer & Feld LLP ("Akin, Gump") provides
   legal services to American Airlines, Inc., an affiliate of the Manager. Mr.
   Feld has advised the Trusts that he has had no material involvement in the
   services provided by Akin, Gump to American Airlines, Inc. and that he has
   received no material benefit in connection with these services. Akin, Gump
   does not provide legal services to the Manager or AMR Corporation.

         All Trustees and officers as a group own less than 1% of the
outstanding shares of any of the Funds.

         As compensation for their service to the Trust, the American AAdvantage
Mileage Funds, the American Select Funds and the AMR Trust (collectivley, the
"Trusts"), the Independent Trustees and their spouses receive free air travel
from American Airlines, Inc., an affiliate of the Manager. The Trusts pay
American Airlines the flight service charges incurred for these travel
arrangements. The Trusts compensate each Trustee with payments in an amount
equal to the Trustees' income tax on the value of this free airline travel. Mr.
O'Sullivan, as a retiree of American Airlines, Inc., already receives flight
benefits. Prior to March 1, 2000, the Trusts compensated Mr. O'Sullivan up to
$10,000 annually to cover his personal flight service charges and the charges
for his three adult children, as well as any income tax charged on the value of
these flight benefits. Beginning March 1, 2000, Mr. O'Sullivan will receive an
annual retainer of $20,000 plus $1,250 for each Board meeting attended. Trustees
are also reimbursed for any expenses incurred in attending Board meetings. These
amounts (excluding reimbursements) are reflected in the following table for the
fiscal year ended October 31, 1999. The compensation amounts below include the
flight service charges paid by the Trusts to American Airlines.


<TABLE>
<CAPTION>
                                        Aggregate          Pension or Retirement
                                       Compensation      Benefits Accrued as Part    Estimated Annual     Total Compensation
                                         From the           of the AAdvantage         Benefits Upon           From the
Name of Trustee                      AAdvantage Trust        Trust's Expenses           Retirement              Trusts
- ---------------                    -------------------   ------------------------    ----------------     ------------------
<S>                                <C>                   <C>                         <C>                  <C>
William F. Quinn                            $0                      $0                      $0                    $0
Alan D. Feld                             $27,894                    $0                      $0                 $85,697
Ben J. Fortson                            $2,532                    $0                      $0                  $7,778
John S. Justin                              $0                      $0                      $0                    $0
Stephen D. O'Sullivan                       $0                      $0                      $0                    $0
Roger T. Staubach                         $9,439                    $0                      $0                 $28,997
Kneeland Youngblood                      $21,194                    $0                      $0                 $65,114
</TABLE>

             TRUSTEES AND OFFICERS OF THE EQUITY 500 INDEX PORTFOLIO

         The Equity 500 Index Portfolio Board oversees the activities of the
Equity 500 Index Portfolio and reviews contractual arrangements with companies
that provide services to the Portfolio. The Trustees and officers of the Equity
500 Index Portfolio and their principal occupations during the past five years
are set forth below. Their titles may have varied during that period.


                                       8
<PAGE>   156


<TABLE>
<CAPTION>
                                          POSITION WITH
                                          EQUITY 500
NAME, AGE AND ADDRESS                     INDEX PORTFOLIO      PRINCIPAL OCCUPATION DURING PAST 5 YEARS
- ---------------------                     ---------------      ----------------------------------------
<S>                                       <C>                  <C>
William L. Boyan (61)                     Trustee              Chairman of the Board of Trustees, Old Mutual South Africa
John Hancock Financial Services                                Equity Trust (1995-Present); Trustee, Children's Hospital and
200 Clarendon Street                                           Children's Medical Center (1983-Present); Director (1983-1998)
Boston, MA  02117                                              and President and Chief Operations Officer (1992-1998), John
                                                               Hancock Mutual Life Insurance Company.

Michael F. Holland (54)                   Trustee              Director and President, Holland & Company LLC (1995-Present);
375 Park Avenue                                                General Partner, The Blackstone Group (1994-1995).
New York, NY  10152

Rina K. Spence (50)                       Trustee              Founder, President and CEO, Spence Center for Women's Health
7 Acacia Street                                                (1994-1998).
Cambridge, MA  02138

Douglas T. Williams (59)                  Trustee              Executive/Senior Vice President, Chase Manhattan Bank (1987-1999).
P.O. Box 779
Nantucket, MA  02554

James B. Little (64)                      President and        Senior Vice President and CEO of Mutual Funds, John Hancock
695 Adams Street                          Treasurer            Funds (1986-1998); Senior Vice President, Putnam Investments
Dorchester, MA  02212                                          (1979-1986).
</TABLE>

         Prior to March 1, 2000, the S&P 500 Index Fund invested all of its
investable assets in the BT Equity 500 Index Portfolio. The BT Equity 500 Index
Portfolio and certain other investment companies advised by BT (the "BT Funds
Complex") collectively pay each Trustee who is not a director, officer or
employee of BT or any of its affiliates an annual fee of $10,000, respectively,
per annum plus $1,250, respectively, per meeting attended and reimburses them
for travel and out-of-pocket expenses. For the years ended December 31, 1998,
and 1999 the BT Equity 500 Index Portfolio incurred Trustees fees equal to
$2,982 and $4,242, respectively.

         The following table reflects fees paid to the Trustees of the BT Equity
500 Index Portfolio for their services to that Portfolio and to certain other
investment companies advised by BT (the "BT Funds Complex") for the year ended
December 31, 1999.

<TABLE>
<CAPTION>
                                                                                        Total Compensation from BT Funds
                                                 Aggregate Compensation from the BT         Complex Paid to Trustees
        Name of Trustee                               Equity 500 Index Portfolio                   (24 Funds)
        ---------------                          ----------------------------------     --------------------------------
<S>                                              <C>                                    <C>
        Charles P. Biggar                                       $1,235                               $43,750
        S. Leland Dill                                          $1,074                               $43,750
        Martin J. Gruber                                         $212                                $45,000
        Richard J. Herring                                       $189                                $43,750
        Bruce E. Langton                                         $212                                $43,750
        Philip Saunders, Jr.                                    $1,108                               $45,000
        Harry Van Benschoten                                     $212                                $45,000
</TABLE>


                                       9
<PAGE>   157

                       CONTROL PERSONS AND 5% SHAREHOLDERS

         The following persons may be deemed to control certain Funds by virtue
of their ownership of more than 25% of the outstanding shares of a Fund as of
January 31, 2000:

<TABLE>
<S>                                                                                          <C>
American AAdvantage Balanced Fund
AMR Corporation and subsidiary companies and Employee Benefit Trusts thereof..................84%
4333 Amon Carter Boulevard
Fort Worth, TX  76155

American AAdvantage Large Cap Value Fund
AMR Corporation and subsidiary companies and Employee Benefit Trusts thereof..................98%
4333 Amon Carter Boulevard
Fort Worth, TX  76155

American AAdvantage Small Cap Value Fund
AMR Corporation and subsidiary companies and Employee Benefit Trusts thereof..................97%
4333 Amon Carter Boulevard
Fort Worth, TX  76155

American AAdvantage International Equity Fund
AMR Corporation and subsidiary companies and Employee Benefit Trusts thereof..................51%
4333 Amon Carter Boulevard
Fort Worth, TX  76155

American AAdvantage Short-Term Bond Fund
AMR Corporation and subsidiary companies and Employee Benefit Trusts thereof..................92%
4333 Amon Carter Boulevard
Fort Worth, TX  76155

American AAdvantage S&P 500 Index Fund
AMR Corporation and subsidiary companies and Employee Benefit Trusts thereof..................91%
4333 Amon Carter Boulevard
Fort Worth, TX  76155
</TABLE>

         AMR Corporation and subsidiary companies and Employee Benefit Trusts
thereof own 100% of the shares of the AMR Class of the Balanced Fund, the Large
Cap Value Fund, the Small Cap Value Fund, the International Equity Fund, the
Intermediate Bond Fund and the Short-Term Bond Fund.

         In addition, the following persons own 5% or more of the outstanding
shares of a Fund or Class as of January 31, 2000:

<TABLE>
<CAPTION>
                                                              Total    Institutional     PlanAhead
American AAdvantage International Equity Fund                 Fund        Class            Class
- ---------------------------------------------                 ----     -------------     ---------
<S>                                                           <C>      <C>               <C>
Sky Chefs Master Trust                                          11%               78%
   601 Ryan Plaza Drive
   Arlington, TX  76011
</TABLE>

<TABLE>
<CAPTION>
                                                              Total    Institutional     PlanAhead
American AAdvantage International Equity Fund                 Fund        Class            Class
- ---------------------------------------------                 ----     -------------     ---------
<S>                                                           <C>      <C>               <C>
The Burnett Foundation                                                             7%
   801 Cherry Street, Suite 1400
   Fort Worth, TX  76102
Charles Schwab & Co.*                                           12%*              24%*          28%*
   101 Montgomery Street
   San Francisco, CA  94104-4122
Fidelity Investments Institutional Operations Co. Inc.*                                         25%*
   100 Magellan Way
   Covington, KY  41015-1999
NA Bank & Co.*                                                                     8%*           8%*
   P.O. Box 2180
   Tulsa, OK  74101-2180
National Financial Services Corp.*                                                 9%*          13%*
   P.O. Box 3908
   New York, NY  10163-3908
Oklahoma Gas & Electric                                                            5%
   P.O. Box 321
   Oklahoma City, OK 73101-0321
*Denotes record owner of Fund shares only
</TABLE>


                                       10
<PAGE>   158


<TABLE>
<CAPTION>
                                                              Total    Institutional     PlanAhead
American AAdvantage S&P 500 Index Fund                        Fund        Class            Class
- --------------------------------------                        ----     -------------     ---------
<S>                                                           <C>      <C>               <C>
Charles Schwab & Co.*                                                                           16%*
   4500 Cherry Creek Dr. South, Suite 700
   Denver, CO  80222
Pershing*                                                                                        6%*
   One Pershing Plaza, 6th Floor
   Jersey City, NJ  07399-0001
Retirement Advisors of America*                                  8%*               8%*
   13155 Noel Road, Floor 24
   Dallas, TX  75240-5090
*Denotes record owner of Fund shares only
</TABLE>


<TABLE>
<CAPTION>
                                                              Total    Institutional     PlanAhead
American AAdvantage Intermediate Bond Fund                    Fund        Class            Class
- ------------------------------------------                    ----     -------------     ---------
<S>                                                           <C>      <C>               <C>
 National Financial Services Corp.*                                                             77%*
    P.O. Box 3908
    New York, NY  10163-3908
 Retirement Advisors of America*                                76%*              99%*
    13155 Noel Road, Floor 24
    Dallas, TX  75240-5090
*Denotes record owner of Fund shares only
</TABLE>


<TABLE>
<CAPTION>
                                                              Total    Institutional     PlanAhead
American AAdvantage Short-Term Bond Fund                      Fund        Class            Class
- ----------------------------------------                      ----     -------------     ---------
<S>                                                           <C>      <C>               <C>
Charles Schwab & Co.*                                                             14%*           7%*
   101 Montgomery Street
   San Francisco, CA  94104-4122
C.R. Smith Museum                                                                 39%
   P.O. Box 619616 MD 5334
   Dallas/Fort Worth Airport, TX  75261-9616
Fidelity Investments*                                                                           42%*
   P.O. Box 73307
   Chicago, IL  60673-7307
First Financial Trust                                                             17%
   161 Worcester Road
   Framingham, MA 01701
The Komen Foundation Endowment                                                    10%
   5005 LBJ Freeway, Suite 250
   Dallas, TX  75244-6120
National Financial Services Corp.*                                                12%*           5%*
   P.O. Box 3908
   New York, NY  10163-3908
*Denotes record owner of Fund shares only
</TABLE>


<TABLE>
<CAPTION>
                                                              Total    Institutional     PlanAhead
American AAdvantage Money Market Fund                         Fund        Class            Class
- -------------------------------------                         ----     -------------     ---------
<S>                                                           <C>      <C>               <C>
LA Teachers Retirement System                                                      5%
   Custodial Trust Co.
   101 Carnegie Center
   Princeton, NJ  08540-6231
DFW International Airport Revenue Bonds                                            6%
   Chase Bank of Texas NA
   600 Travis Street, Suite 1150
   Houston, TX  77002-3002
Hewlett Packard Finance Co.                                      7%               11%
   3000 Hanover Street
   Palo Alto, CA 94304-1185
NA Bank & Co.*                                                                     7%*
   P.O. Box 2180
   Tulsa, OK  74101-2180
National Investor Service Corp.*                                 9%*                            91%*
   55 Water Street, 32nd Floor
   New York, NY  10041-3299
Orange County Litigation Fund                                                      8%
   c/o Metropolitan West Financial Inc.
   11440 San Vicente Blvd.
   Los Angeles, CA  90049-6242
*Denotes record owner of Fund shares only
</TABLE>


                                       11
<PAGE>   159


<TABLE>
<CAPTION>
                                                              Total    Institutional     PlanAhead
American AAdvantage Municipal Market Fund                     Fund        Class            Class
- -----------------------------------------                     ----     -------------     ---------
<S>                                                           <C>      <C>               <C>
Anne and Martin McNamara                                                          74%
   9307 Guernsey Lane
   Dallas, TX  75220-3929
Merit Energy Co.                                                                  14%
   12222 Merit Dr., Suite 1500
   Dallas, TX 75251-3206
Merit Partners LP                                                                 11%
   12222 Merit Dr., Suite 1500
   Dallas, TX 75251-3206
National Investor Service Corp.*                                12%*                           100%*
   55 Water Street, 32nd Floor
   New York, NY  10041-3299
*Denotes record owner of Fund shares only
</TABLE>


<TABLE>
<CAPTION>
American AAdvantage U.S. Government                           Total    Institutional     PlanAhead
Money Market Fund                                             Fund        Class            Class
- -------------------------------------                         ----     -------------     ---------
<S>                                                           <C>      <C>               <C>
Grapevine Industrial Development Corp.                                            22%
   First National Bank of Chicago
   One First National Plaza, Suite 0126
   Chicago, IL  60670
Hare & Co.                                                                        11%
   Bank of New York
   One Wall Street
   New York, NY  10005-2505
Lone Star Airport Improvement Authority                          7%               30%
   First National Bank of Chicago
   One First National Place
   Chicago, IL  60670
National Investor Service Corp.*                                 6%*                            19%*
   55 Water Street, 32nd Floor
   New York, NY  10041-3299
Transco & Co*                                                   30%*              32%*          80%*
   105 N. Main
   Wichita, KS  67201
*Denotes record owner of Fund shares only
</TABLE>

                         INVESTMENT ADVISORY AGREEMENTS

         To the extent that the Funds invest all of their investable assets in a
corresponding portfolio of the AMR Trust, investment advisers receive a fee on
behalf of the Portfolio, and not the corresponding Fund. The following table
reflects the fees paid to the investment advisers from the AMR Trust for the
fiscal years ending October 31, 1997, 1998 and 1999:


                                       12
<PAGE>   160


<TABLE>
<CAPTION>

                                                        Investment Advisory  Investment Advisory     Investment Advisory
                       Adviser                             Fees for 1997        Fees for 1998           Fees for 1999
                       -------                          -------------------  -------------------    ---------------------
<S>                                                     <C>                  <C>                    <C>
Barrow, Hanley Mewhinney & Strauss, Inc.                    $1,052,749           $1,324,073              $1,302,106
Brandywine Asset Management, Inc.                           $  857,875           $1,291,065              $1,377,569
GSB Investment Management, Inc.*                            $  804,221           $  936,043              $  881,048
Hotchkis and Wiley                                          $1,607,851           $1,970,618              $2,157,417
Independence Investment Associates, Inc.                    $1,110,438           $1,258,417              $1,340,561
Lazard Asset Management                                        N/A**                N/A**                $  699,871
Morgan Stanley Asset Management                             $  885,253           $1,231,651              $  410,090
Templeton Investment Counsel, Inc.                          $  669,848           $  994,381              $1,196,727
</TABLE>


*  As of March 1, 2000, GSB Investment Management, Inc. was terminated as an
   investment adviser to the Funds.

** Lazard Asset Management was not an investment adviser to the Funds during
   this period.

         Under the terms of the Equity 500 Index Portfolio's Investment Advisory
Agreement with State Street, State Street manages the Equity 500 Index Portfolio
subject to the supervision and direction of the Equity 500 Index Portfolio
Board. Subject to such policies as the Equity 500 Index Portfolio Board may
determine, State Street furnishes a continuing investment program for the Equity
500 Index Portfolio and makes investment decisions on its behalf. State Street
places all orders for purchases and sales of the Equity 500 Index Portfolio's
investments.

         State Street bears all expenses in connection with the performance of
services under the Agreement. The S&P 500 Index Fund and the Equity 500 Index
Portfolio each bear certain other expenses incurred in their operation,
including: taxes, interest, brokerage fees and commissions, if any; fees of
Trustees of the Portfolio or Trustees of the Trust who are not officers,
directors or employees of State Street, the Manager or any of their affiliates;
SEC fees and state Blue Sky qualification fees; charges of custodians and
transfer and dividend disbursing agents; certain insurance premiums; outside
auditing and legal expenses; costs attributable to investor services, including
telephone and personnel expenses; costs of preparing and printing prospectuses
and statements of additional information for regulatory purposes and for
distribution to existing shareholders; costs of shareholders' reports and
meetings of shareholders, officers and Trustees of the Equity 500 Index
Portfolio or Trustees of the Trust, and any extraordinary expenses.

         Prior to March 1, 2000, the S&P 500 Index Fund invested all of its
investable assets in the BT Equity 500 Index Portfolio. For the years ended
December 31, 1997, 1998 and 1999, BT earned $2,430,147, $3,186,503 and
$5,174,400, respectively, as compensation for investment advisory services
provided to the BT Equity 500 Index Portfolio. During the same periods, BT
reimbursed $1,739,490, $799,296 and $214,624, respectively, to the BT Equity 500
Index Portfolio to cover expenses.

         Each Investment Advisory Agreement will automatically terminate if
assigned, and may be terminated without penalty at any time by the Manager, by a
vote of a majority of the Trustees or by a vote of a majority of the outstanding
voting securities of the applicable Fund on no less than thirty (30) days' nor
more than sixty (60) days' written notice to the investment adviser, or by the
investment adviser upon sixty (60) days' written notice to the Trust. The
Investment Advisory Agreements will continue in effect provided that annually
such continuance is specifically approved by a vote of the Trustees, including
the affirmative votes of a majority of the Trustees who are not parties to the
Agreement or "interested persons" (as defined in the 1940 Act) of any such
party, cast in person at a meeting called for the purpose of considering such
approval, or by the vote of shareholders.

         SWS Financial Services, Inc. ("SWS"), located at 7001 Preston Road,
Dallas, Texas 75205, is the distributor and principal underwriter of the Funds'
shares, and, as such, receives an annualized fee of $50,000 from the Manager for
distributing the shares of the Trust, the American AAdvantage Mileage Funds and
the American Select Funds.

            MANAGEMENT, ADMINISTRATIVE SERVICES AND DISTRIBUTION FEES

         The Manager is paid a management fee as compensation for paying
investment advisory fees and for providing the Trust and the AMR Trust with
advisory and asset allocation services. Pursuant to management and
administrative services agreements, the Manager provides the Trust and the AMR
Trust with office space, office equipment and personnel necessary to manage and
administer the Trusts' operations. This includes:

         o        complying with reporting requirements;
         o        corresponding with shareholders;
         o        maintaining internal bookkeeping, accounting and auditing
                  services and records; and
         o        supervising the provision of services to the Trusts by third
                  parties.

         In addition to its oversight of the investment advisers, the Manager
invests the portion of Fund assets that the investment advisers determine to be
allocated to high quality short-term debt obligations.


                                       13
<PAGE>   161


         Management fees for the fiscal years ended October 31 were
approximately as follows: 1997, $13,730,443, of which $7,061,014 was paid by the
Manager to the other investment advisers; 1998, $17,230,000, of which
approximately $8,675,000 was paid by the Manager to the other investment
advisers and 1999, $16,283,000, of which approximately $8,551,000 was paid by
the Manager to the other investment advisers. Management fees in the amount of
approximately $7,309, $407,195 and $48,000 were waived by the Manager during the
fiscal years ended October 31, 1997, 1998 and 1999.

         Under the Management Agreement, the Manager presently monitors the
services provided by State Street to the Equity 500 Index Portfolio. The Manager
receives no fee for providing these monitoring services. In the event that the
Board determines that it is in the best interest of the S&P 500 Index Fund's
shareholders to withdraw its investment from the Equity 500 Index Portfolio, the
Manager would become responsible for directly managing the assets of the S&P 500
Index Fund. In such event, the Fund would pay the Manager an annual fee of up to
0.10% of the Fund's average net assets, accrued daily and paid monthly.

         In addition to the management fee, the Manager is paid an
administrative services fee for providing administrative and management services
(other than investment advisory services) to the Funds. Administrative services
fees for the fiscal years ended October 31 were approximately as follows: 1997,
$4,538,345, 1998, $7,476,000 and 1999, $10,120,000.

         The Manager receives compensation for administrative and oversight
functions with respect to securities lending of the Portfolios of the AMR Trust.
Fees received by the Manager from securities lending for the fiscal years ended
October 31 were approximately as follows: 1997, $81,113, 1998, $175,025 and
1999, $213,000.

         State Street provides administrative services to the Equity 500 Index
Portfolio. Under the Administration Agreement between the Equity 500 Index
Portfolio and State Street, State Street is obligated on a continuous basis to
provide such administrative services as the Equity 500 Index Portfolio Board
reasonably deems necessary for the proper administration of the Portfolio. State
Street generally will assist in all aspects of the Portfolio's operations;
supply and maintain office facilities (which may be in State Street's own
offices), statistical and research data, data processing services, clerical,
accounting, bookkeeping and recordkeeping services (including without limitation
the maintenance of such books and records as are required under the 1940 Act and
the rules thereunder, except as maintained by other agents), internal auditing,
executive and administrative services, and stationery and office supplies;
prepare reports to investors; prepare and file tax returns; supply financial
information and supporting data for reports to and filing with the SEC and
various state Blue Sky authorities; supply supporting documentation for meetings
of the Equity 500 Index Portfolio Board; provide monitoring reports and
assistance regarding compliance with its Declaration of Trust, By-Laws,
investment objectives and policies and with Federal and state securities laws;
arrange for appropriate insurance coverage; calculate net asset values, net
income and realized capital gains or losses; and negotiate arrangements with,
and supervise and coordinate the activities of, agents and others to supply
services.

         Prior to March 1, 2000, the S&P 500 Index Fund invested all of its
investable assets in the BT Equity 500 Index Portfolio. For the years ended
December 31, 1997, 1998 and 1999, BT earned $1,215,073, $676,625 and $344,960,
respectively, as compensation for administrative and other services provided to
the BT Equity 500 Index Portfolio.

         The PlanAhead Class has adopted a service plan ("Service Plan") which
provides that each Fund's PlanAhead Class will pay 0.25% per annum of its
average daily net assets to the Manager (or another entity approved by the
Board). The Manager or these approved entities may spend such amounts on any
activities or expenses primarily intended to result in or relate to the
servicing of PlanAhead Class shares including but not limited to payment of
shareholder service fees and transfer agency or sub-transfer agency expenses.
The fee, which is included as part of a Fund's "Other Expenses" in the Table of
Fees and Expenses in the PlanAhead Class Prospectus, will be payable monthly in
arrears without regard to whether the amount of the fee is more or less than the
actual expenses incurred in a particular month by the entity for the services
provided pursuant to the Service Plan. The primary expenses expected to be
incurred under the Service Plan are transfer agency fees and servicing fees paid
to financial intermediaries such as plan sponsors and broker-dealers.

                             OTHER SERVICE PROVIDERS

         The transfer agent for the Trust is State Street Bank & Trust Company
("State Street"), Boston, Massachusetts, who provides transfer agency services
to Fund shareholders directly and through its affiliate National Financial Data
Services, Kansas City, Missouri. State Street also serves as custodian for the
Portfolios


                                       14
<PAGE>   162


of the AMR Trust and the Funds. In addition to its other duties as custodian,
pursuant to instructions given by the Manager, State Street invests certain
excess cash balances of certain funds in various futures contracts. State Street
also serves as custodian and transfer agent for the assets of the Equity 500
Index Portfolio. The independent auditor for the Funds, the AMR Trust and the
Equity 500 Index Portfolio is Ernst & Young LLP, Dallas, Texas and Boston,
Massachusetts.

                        PORTFOLIO SECURITIES TRANSACTIONS

         Each investment adviser will place its own orders to execute securities
transactions that are designed to implement the applicable Portfolio's
investment objective and policies. In placing such orders, each investment
adviser will seek the best available price and most favorable execution. The
full range and quality of services offered by the executing broker or dealer
will be considered when making these determinations. Pursuant to written
guidelines approved by the AMR Trust Board, as appropriate, an investment
adviser of a Portfolio, or its affiliated broker-dealer, may execute portfolio
transactions and receive usual and customary brokerage commissions (within the
meaning of Rule 17e-1 of the 1940 Act) for doing so. A Portfolio's turnover
rate, or the frequency of portfolio transactions, will vary from year to year
depending on market conditions and the Portfolio's cash flows. High portfolio
activity increases a Portfolio's transaction costs, including brokerage
commissions, and may result in a greater number of taxable transactions.

         The Investment Advisory Agreements provide, in substance, that in
executing portfolio transactions and selecting brokers or dealers, the principal
objective of each investment adviser is to seek the best net price and execution
available. It is expected that securities ordinarily will be purchased in the
primary markets, and that in assessing the best net price and execution
available, each investment adviser shall consider all factors it deems relevant,
including the breadth of the market in the security, the price of the security,
the financial condition and execution capability of the broker or dealer and the
reasonableness of the commission, if any, for the specific transaction and on a
continuing basis.

         The Portfolios of the AMR Trust have established brokerage commission
recapture arrangements with certain brokers or dealers. If a Portfolio
investment adviser chooses to execute a transaction through a participating
broker, the broker rebates a portion of the commission back to the Portfolio.
Any collateral benefit received through participation in the commission
recapture program is directed exclusively to the Portfolios. Neither the Manager
nor any of the investment advisers receive any benefits from the commission
recapture program. A Portfolio investment adviser's participation in the
brokerage commission recapture program is optional. Each investment adviser
retains full discretion in selecting brokerage firms for securities transactions
and is instructed to use the commission recapture program for a transaction only
if it is consistent with the investment adviser's obligation to seek the best
execution available.

         State Street places all orders for purchases and sales of the Equity
500 Index Portfolio's investments. In selecting broker-dealers, State Street may
consider research and brokerage services furnished to it and its affiliates.
Affiliates of State Street may receive brokerage commissions from the Equity 500
Index Portfolio in accordance with procedures adopted by the Equity 500 Index
Portfolio Board under the 1940 Act, which procedures require periodic review of
these transactions.

         In certain instances there may be securities that are suitable for the
Equity 500 Index Portfolio as well as for one or more of State Street's other
clients. Investment decisions for the Equity 500 Index Portfolio and for State
Street's other clients are made with a view to achieving their respective
investment objectives. It may develop that a particular security is bought or
sold for only one client even though it might be held by, or bought or sold for,
other clients. Likewise, a particular security may be bought for one or more
clients when one or more clients are selling that same security. Some
simultaneous transactions are inevitable when several clients receive investment
advice from the same investment adviser, particularly when the same security is
suitable for the investment objectives of more than one client. When two or more
clients are simultaneously engaged in the purchase or sale of the same security,
the securities are allocated among clients in a manner believed to be equitable
to each. It is recognized that in some cases this system could have a
detrimental effect on the price or volume of the security as far as the Equity
500 Index Portfolio is concerned. However, it is believed that the ability of
the Equity 500 Index Portfolio to participate in volume transactions will
produce better executions for the Portfolio.

         State Street may have deposit, loan and other commercial banking
relationships with the issuers of obligations which may be purchased on behalf
of the Equity 500 Index Portfolio, including outstanding loans to such issuers
which could be repaid in whole or in part with the proceeds of securities so
purchased. Such


                                       15
<PAGE>   163


affiliates deal, trade and invest for their own accounts in such obligations and
are among the leading dealers of various types of such obligations. State Street
has informed the Equity 500 Index Portfolio that, in making its investment
decisions, it does not obtain or use material inside information in its
possession or in the possession of any of its affiliates.

         In selecting brokers or dealers to execute particular transactions,
investment advisers are authorized to consider "brokerage and research services"
(as those terms are defined in Section 28(e) of the Securities Exchange Act of
1934), provision of statistical quotations (including the quotations necessary
to determine a Portfolio's net asset value), the sale of Trust shares by such
broker-dealer or the servicing of Trust shareholders by such broker-dealer, and
other information provided to the applicable Portfolio, to the Manager, State
Street and/or to the investment advisers (or their affiliates), provided,
however, that the investment adviser determines that it has received the best
net price and execution available. The investment advisers are also authorized
to cause a Portfolio to pay a commission to a broker or dealer who provides such
brokerage and research services for executing a portfolio transaction which is
in excess of the amount of the commission another broker or dealer would have
charged for effecting that transaction. The Trustees, the Manager or the
investment advisers, as appropriate, must determine in good faith, however, that
such commission was reasonable in relation to the value of the brokerage and
research services provided viewed in terms of that particular transaction or in
terms of all the accounts over which the Manager or the investment adviser
exercises investment discretion.

         For the fiscal years ended October 31, 1997, 1998 and 1999, the
following brokerage commissions were paid by the Portfolios:

<TABLE>
<CAPTION>
Portfolio                                1997            1998            1999
- ---------                             ----------      ----------      ----------
<S>                                   <C>             <C>             <C>
Balanced                              $  562,493      $  520,881      $  489,411
Large Cap Value                       $1,192,792      $1,643,540      $1,520,056
Small Cap Value*                      $        0      $        0      $  111,087
International Equity                  $  956,160      $1,833,458      $1,331,000
</TABLE>

   * The Small Cap Value Portfolio commenced operations on December 31, 1998.

         The commissions listed above were paid by the corresponding Portfolios
of the AMR Trust. Shareholders of the Funds bear only their pro-rata portion.

         For the fiscal years ended December 31, 1997, 1998 and 1999 the BT
Equity 500 Index Portfolio paid the following brokerage commissions: $341,058,
$534,801 and $678,820. Shareholders of the S&P 500 Index Fund bear only their
pro-rata portion of the brokerage commissions.

         The fees of the investment advisers are not reduced by reason of
receipt of such brokerage and research services. However, with disclosure to and
pursuant to written guidelines approved by the AMR Trust Board, or the Equity
500 Index Portfolio Board, an investment adviser of a Portfolio or its
affiliated broker-dealer may execute portfolio transactions and receive usual
and customary brokerage commissions (within the meaning of Rule 17e-1 under the
1940 Act) for doing so.

         During the fiscal year ended October 31, 1997, the following
commissions were paid to affiliated brokers:

<TABLE>
<CAPTION>
PORTFOLIO                    BROKER                     AFFILIATED WITH                                  COMMISSION
- ---------                    ------                     -----------------                                -----------
<S>                          <C>                        <C>                                              <C>
Balanced                     Merrill Lynch & Co.        Hotchkis and Wiley                               $    43,886
Large Cap Value              Merrill Lynch & Co.        Hotchkis and Wiley                               $   105,166
International Equity         Jardine Fleming            Rowe-Price Fleming International, Inc.           $     3,260
International Equity         Ord Minnett                Rowe-Price Fleming International, Inc.           $    13,141
International Equity         Robert Fleming & Co.       Rowe-Price Fleming International, Inc.           $    81,109
International Equity         Morgan Stanley Intl.       Morgan Stanley Asset Management Inc.             $     5,413
International Equity         Merrill Lynch & Co.        Hotchkis and Wiley                               $    50,428
</TABLE>

         The percentages of total commissions of the Balanced Portfolio, the
Large Cap Value Portfolio and the International Equity Portfolio paid to
affiliated brokers in 1997 were 7.80%, 8.82% and 16.04%, respectively. The
transactions represented 5.75% of the Balanced Portfolio, 6.20% of the Large Cap
Value Portfolio and 9.2% of the International Equity Portfolio's total dollar
value of portfolio transactions for the fiscal year ended October 31, 1997.

         During the fiscal year ended October 31, 1998, the following
commissions were paid to affiliated brokers:


                                       16
<PAGE>   164


<TABLE>
<CAPTION>
PORTFOLIO                    BROKER                           AFFILIATED WITH                                COMMISSION
- ---------                    ------                           ---------------                                -----------
<S>                          <C>                              <C>                                            <C>
Balanced                     Merrill Lynch & Co.              Hotchkis and Wiley                             $    38,538
Balanced                     Morgan Stanley Intl.             Morgan Stanley Asset Management                $    16,486
Balanced                     Legg Mason Wood Walker           Legg Mason, Inc.                               $       930
Large Cap Value              Merrill Lynch & Co.              Hotchkis and Wiley                             $   131,987
Large Cap Value              Morgan Stanley Intl.             Morgan Stanley Asset Management                $    61,469
Large Cap Value              Legg Mason Wood Walker           Legg Mason, Inc.                               $     4,598
International Equity         Merrill Lynch & Co.              Hotchkis and Wiley                             $    29,669
International Equity         Morgan Stanley Intl.             Morgan Stanley Asset Management                $    30,057
International Equity         Robert Fleming & Co.             Rowe-Price Fleming International, Inc.         $    93,606
International Equity         Ord Minnett                      Rowe-Price Fleming International, Inc.         $    13,959
International Equity         Jardine Fleming                  Rowe-Price Fleming International, Inc.         $     3,846
</TABLE>

         The percentages of total commissions of the Balanced Portfolio, the
Large Cap Value Portfolio and the International Equity Portfolio paid to
affiliated brokers in 1998 were 10.74%, 12.05% and 9.33%, respectively. The
transactions represented 7.09% of the Balanced Portfolio, 8.81% of the Large Cap
Value Portfolio and 9.14% of the International Equity Portfolio's total dollar
value of portfolio transactions for the fiscal year ended October 31, 1998.

         During the fiscal year ended October 31, 1999, the following
commissions were paid to affiliated brokers:

<TABLE>
<CAPTION>
PORTFOLIO              BROKER                                      AFFILIATED WITH                 COMMISSION
- ----------             -------                                     ---------------                -----------
<S>                    <C>                                         <C>                            <C>
Balanced               Howard, Weil, Labouisse, Friedrichs, Inc.   Brandywine Asset Management    $     1,200
Balanced               Merrill Lynch & Co.                         Hotchkis and Wiley             $    53,394
Balanced               Southwest Securities                        SWS Financial Services         $     6,243
Large Cap Value        Howard, Weil, Labouisse, Friedrichs, Inc.   Brandywine Asset Management    $     8,100
Large Cap Value        Merrill Lynch & Co.                         Hotchkis and Wiley             $   197,021
Small Cap Value        Merrill Lynch & Co.                         Hotchkis and Wiley             $       366
International Equity   Merrill Lynch & Co.                         Hotchkis and Wiley             $     6,249
</TABLE>

         The percentages of total commissions of the Balanced Portfolio, the
Large Cap Value Portfolio, the Small Cap Value Portfolio and the International
Equity Portfolio paid to affiliated brokers in 1999 were 12.43%, 13.49% 0.33%
and 0.47%, respectively. The transactions represented 11.76% of the Balanced
Portfolio, 9.84% of the Large Cap Value Portfolio, 0.22% of the Small Cap Value
Portfolio and 0.34% of the International Equity Portfolio's total dollar value
of portfolio transactions for the fiscal year ended October 31, 1999.

                               REDEMPTIONS IN KIND

         Although each Fund intends to redeem shares in cash, each reserves the
right to pay the redemption price in whole or in part by a distribution of
readily marketable securities held by the applicable Fund's corresponding
Portfolio. However, shareholders always will be entitled to redeem shares for
cash up to the lesser of $250,000 or 1% of the applicable Fund's net asset value
during any 90-day period. Redemption in kind is not as liquid as a cash
redemption. In addition, if redemption is made in kind, shareholders who receive
securities and sell them could receive less than the redemption value of their
securities and could incur certain transaction costs.

                                 NET ASSET VALUE

         It is the policy of the Money Market Fund, the Municipal Money Market
Fund and the U.S. Government Money Market Fund (collectively the "Money Market
Funds") to attempt to maintain a constant price per share of $1.00. There can be
no assurance that a $1.00 net asset value per share will be maintained. The
portfolio instruments held by the Money Market Funds' corresponding Portfolios
are valued based on the amortized cost valuation technique pursuant to Rule 2a-7
under the 1940 Act. This involves valuing an instrument at its cost and
thereafter assuming a constant amortization to maturity of any discount or
premium, even though the portfolio security may increase or decrease in market
value. Such market fluctuations are generally in response to changes in interest
rates. Use of the amortized cost valuation method requires the corresponding
Portfolios of the Money Market Funds to purchase instruments having remaining
maturities of 397 days or less, to maintain a dollar weighted average portfolio
maturity of 90 days or less, and to invest only in securities determined by the
Trustees to be of high quality with minimal credit risks. The corresponding
portfolios of the Money Market Funds may invest in issuers or instruments that
at the time of purchase have received the highest short-term rating by two
Rating Organizations, such as "D-1" by Duff & Phelps and "F-1" by Fitch IBCA,
Inc., and have received the next highest short-term rating by other Rating
Organizations, such as "A-2" by Standard & Poor's and "P-2" by


                                       17
<PAGE>   165


Moody's Investors Service, Inc. See "Ratings of Municipal Obligations" and
"Ratings of Short-Term Obligations" for further information concerning ratings.

                                 TAX INFORMATION

TAXATION OF THE FUNDS

         To qualify as a regulated investment company ("RIC") under the Internal
Revenue Code of 1986, as amended ("Code"), each Fund (each of which is treated
as a separate corporation for these purposes) must, among other requirements:

         o        Derive at least 90% of its gross income each taxable year from
            dividends, interest, payments with respect to securities loans and
            gains from the sale or other disposition of securities or (in the
            case of the International Equity Fund) foreign currencies, or
            certain other income, including gains from options, futures or
            forward contracts ("Income Requirement");

         o        Diversify its investments in securities within certain
            statutory limits ("Diversification Requirement"); and

         o        Distribute annually to its shareholders at least 90% of its
            investment company taxable income (generally, taxable net investment
            income plus net short-term capital gain and, in the case of the
            International Equity Fund, net gains from foreign currency
            transactions) plus, in the case of the Municipal Money Market Fund,
            net interest income excludable from gross income under section
            103(a) of the Code.

         Each Fund, as an investor in its corresponding Portfolio, is deemed to
own a proportionate share of the Portfolio's assets and to earn the income on
that share for purposes of determining whether the Fund satisfies the Income and
Diversification Requirements. If a Fund failed to qualify as a RIC for any
taxable year, it would be taxed on the full amount of its taxable income for
that year without being able to deduct the distributions it makes to its
shareholders and the shareholders would treat all those distributions as
dividends (that is, ordinary income) to the extent of the Fund's earnings and
profits.

TAXATION OF THE PORTFOLIOS

         Each Portfolio should be classified as a separate partnership for
federal income tax purposes and is not a "publicly traded partnership." As a
result, each Portfolio is or should not be subject to federal income tax;
instead, each investor in a Portfolio, such as a Fund, is required to take into
account in determining its federal income tax liability its share of the
Portfolio's income, gains, losses, deductions, credits and tax preference items,
without regard to whether it has received any cash distributions from the
Portfolio.

         Because, as noted above, each Fund is deemed to own a proportionate
share of its corresponding Portfolio's assets and to earn a proportionate share
of its corresponding Portfolio's income for purposes of determining whether the
Fund satisfies the requirements to qualify as a RIC, each Portfolio intends to
conduct its operations so that its corresponding Fund will be able to satisfy
all those requirements.

         Distributions to a Fund from its corresponding Portfolio (whether
pursuant to a partial or complete withdrawal or otherwise) will not result in
the Fund's recognition of any gain or loss for federal income tax purposes,
except that (1) gain will be recognized to the extent any cash that is
distributed exceeds the Fund's basis for its interest in the Portfolio before
the distribution, (2) income or gain will be recognized if the distribution is
in liquidation of the Fund's entire interest in the Portfolio and includes a
disproportionate share of any unrealized receivables held by the Portfolio and
(3) loss will be recognized if a liquidation distribution consists solely of
cash and/or unrealized receivables. A Fund's basis for its interest in its
corresponding Portfolio generally will equal the amount of cash and the basis of
any property the Fund invests in the Portfolio, increased by the Fund's share of
the Portfolio's net income and gains and decreased by (a) the amount of cash and
the basis of any property the Portfolio distributes to the Fund and (b) the
Fund's share of the Portfolio's losses.

         A Portfolio may acquire zero coupon or other securities issued with
original issue discount. As an investor in a Portfolio that holds those
securities, a Fund would have to include in its income its share of the original
issue discount that accrues on the securities during the taxable year, even if
the Portfolio (and, hence, the Fund) receives no corresponding payment on the
securities during the year. Because each Fund annually


                                       18
<PAGE>   166


must distribute substantially all of its investment company taxable income,
including any original issue discount, to satisfy the Distribution Requirement
and avoid imposition of the 4% excise tax described in the Prospectus, a Fund
may be required in a particular year to distribute as a dividend an amount that
is greater than the total amount of cash it actually receives. Those
distributions would be made from the Fund's cash assets, if any, or the proceeds
of redemption of a portion of the Fund's interest in its corresponding Portfolio
(which redemption proceeds would be paid from the Portfolio's cash assets or the
proceeds of sales of portfolio securities, if necessary). The Portfolio might
realize capital gains or losses from any such sales, which would increase or
decrease the Fund's investment company taxable income and/or net capital gain
(the excess of net long-term capital gain over net short-term capital loss).

         If the Balanced, the Large Cap Value, the International Equity, or the
Small Cap Value Portfolio acquires stock in a foreign corporation that is a
"passive foreign investment company" ("PFIC") and holds the stock beyond the end
of the year of acquisition, its corresponding Fund will be subject to federal
income tax on the Fund's share of a portion of any "excess distribution"
received by the Portfolio on the stock or of any gain realized by the Portfolio
from disposition of the stock (collectively "PFIC income"), plus interest
thereon, even if the Fund distributes the PFIC income as a taxable dividend to
its shareholders. A Fund may avoid this tax and interest if its corresponding
Portfolio elects to treat the PFIC as a "qualified electing fund;" however, the
requirements for that election are difficult to satisfy. These Portfolios
currently do not intend to acquire securities that are considered PFICs.

         Hedging strategies, such as entering into forward contracts and selling
and purchasing options and futures contracts, involve complex rules that will
determine for federal income tax purposes the amount, character and timing of
recognition of gains and losses the Balanced, Large Cap Value, Small Cap Value,
International Equity and the Equity 500 Index Portfolio realize in connection
therewith. The International Equity Fund's share of the International Equity
Portfolio's (1) income from foreign currencies (except certain gains that may be
excluded by future regulations) and (2) income from transactions in futures and
forward contracts derived with respect to its business of investing in
securities or foreign currencies will qualify as allowable income for that Fund
under the Income Requirement. The Balanced, Large Cap Value and Small Cap Value
Funds' share of their corresponding Portfolios' income from futures contracts
will qualify as allowable income under the Income Requirement. Similarly, the
S&P 500 Index Fund's share of the Equity 500 Index Portfolio's income from
options and futures derived with respect to its business of investing securities
will so qualify for that Fund.

         Dividends and interest received by the International Equity Portfolio,
and gains realized thereby, may be subject to income, withholding or other taxes
imposed by foreign countries and U.S. possessions that would reduce the yield
and/or total return on its securities. Tax treaties between certain countries
and the United States may reduce or eliminate these foreign taxes, however, and
many foreign countries do not impose taxes on capital gains on investments by
foreign investors.

TAXATION OF THE FUNDS' SHAREHOLDERS

         A portion of the dividends from a Fund's investment company taxable
income, whether received in cash or paid in additional Fund shares, may be
eligible for the dividends-received deduction allowed to corporations. The
eligible portion may not exceed the Fund's share of the aggregate dividends
received by its corresponding Portfolio from U.S. corporations. However,
dividends received by a corporate shareholder and deducted by it pursuant to the
dividends-received deduction are subject indirectly to the alternative minimum
tax. No dividends paid by the Money Market Funds, the International Equity Fund,
the Intermediate Bond Fund or the Short-Term Bond Fund are expected to be
eligible for this deduction.

         Distributions by the Municipal Money Market Fund of the amount by which
the Fund's share of its corresponding Portfolio's income on tax-exempt
securities exceeds certain amounts disallowed as deductions, designated by the
Fund as "exempt-interest dividends," generally may be excluded from gross income
by its shareholders. Dividends paid by the Fund will qualify as exempt-interest
dividends if, at the close of each quarter of its taxable year, at least 50% of
the value of its total assets (including its share of the Municipal Money Market
Portfolio's assets) consists of securities the interest on which is excludable
from gross income under section 103(a) of the Code. The Fund intends to continue
to satisfy this requirement. The aggregate dividends excludable from
shareholders' gross income may not exceed the Fund's net tax-exempt income. The
shareholders' treatment of dividends from the Fund under state and local income
tax laws may differ from the treatment thereof under the Code.


                                       19
<PAGE>   167


         Exempt-interest dividends received by a corporate shareholder may be
indirectly subject to the alternative minimum tax. In addition, entities or
persons who are "substantial users" (or persons related to "substantial users")
of facilities financed by private activity bonds ("PABs") or industrial
development bonds ("IDBs") should consult their tax advisers before purchasing
shares of the Municipal Money Market Fund because, for users of certain of these
facilities, the interest on those bonds is not exempt from federal income tax.
For these purposes, the term "substantial user" is defined generally to include
a "non-exempt person" who regularly uses in trade or business a part of a
facility financed from the proceeds of PABs or IDBs.

         Up to 85% of social security and railroad retirement benefits may be
included in taxable income for recipients whose adjusted gross income (including
income from tax-exempt sources such as the Municipal Money Market Fund) plus 50%
of their benefits exceeds certain base amounts. Exempt-interest dividends from
the Fund still are tax-exempt to the extent described above; they are only
included in the calculation of whether a recipient's income exceeds the
established amounts.

         If more than 50% of the value of the International Equity Fund's total
assets (including its share of the International Equity Portfolio's total
assets) at the close of its taxable year consists of securities of foreign
corporations, the Fund will be eligible to, and may, file an election with the
IRS that will enable the Fund's shareholders, in effect, to receive the benefit
of the foreign tax credit with respect to the Fund's share of any foreign and
U.S. possessions income taxes paid by the Portfolio. If the Fund makes this
election, the Fund will treat those taxes as dividends paid to its shareholders
and each shareholder will be required to (1) include in gross income, and treat
as paid by him, his proportionate share of those taxes, (2) treat his share of
those taxes and of any dividend paid by the Fund that represents income from
foreign or U.S. possessions sources as his own income from those sources and (3)
either deduct the taxes deemed paid by him in computing his taxable income or,
alternatively, use the foregoing information in calculating the foreign tax
credit against his federal income tax. If the election is made, the Fund will
report to its shareholders shortly after each taxable year their respective
share of the Portfolio's income from foreign and U.S. possessions sources and
the taxes paid by the Portfolio to foreign countries and U.S. possessions.
Pursuant to that election, individuals who have no more than $300 ($600 for
married persons filing jointly) of creditable foreign taxes included on Forms
1099 and all of whose foreign source income is "qualified passive income" may
elect each year to be exempt from the extremely complicated foreign tax credit
limitation and will be able to claim a foreign tax credit without having to file
the detailed Form 1116 that otherwise is required.

         The foregoing is only a summary of some of the important federal tax
considerations affecting the Funds and their shareholders and is not intended as
a substitute for careful tax planning. Accordingly, prospective investors are
advised to consult their own tax advisers for more detailed information
regarding the above and for information regarding federal, state, local and
foreign taxes.

                        YIELD AND TOTAL RETURN QUOTATIONS

         A quotation of yield on shares of each class of the Money Market Funds
may appear from time to time in advertisements and in communications to
shareholders and others. Quotations of yields are indicative of yields for the
limited historical period used but not for the future. Yield will vary as
interest rates and other conditions change. Yield also depends on the quality,
length of maturity and type of instruments invested in by the corresponding
Portfolios of the Money Market Funds, and the applicable class's operating
expenses. A comparison of the quoted yields offered for various investments is
valid only if yields are calculated in the same manner. In addition, other
similar investment companies may have more or less risk due to differences in
the quality or maturity of securities held.

         The yields of the Money Market Funds may be calculated in one of two
ways:

         (1) Current Yield--the net average annualized return without
         compounding accrued interest income. For a 7-day current yield, this is
         computed by dividing the net change in value over a 7 calendar-day
         period of a hypothetical account having one share at the beginning of a
         7 calendar-day period by the value of the account at the beginning of
         this period to determine the "base period return." The quotient is
         multiplied by 365 divided by 7 and stated to two decimal places. A
         daily current yield is calculated by multiplying the net change in
         value over one day by 365 and stating it to two decimal places. Income
         other than investment income and capital changes, such as realized
         gains and losses from the sale of securities and unrealized
         appreciation and depreciation, are excluded in calculating the net
         change in value of an account. However, this calculation includes the
         aggregate fees and other expenses that are charged to all shareholder
         accounts in a class of a Fund. In determining the net change in value
         of a hypothetical account, this value is adjusted to reflect the value
         of any additional shares purchased with dividends


                                       20
<PAGE>   168


         from the original share and dividends declared on both the original
         share and any such additional shares.

         (2) Effective Yield--the net average annualized return as computed by
         compounding accrued interest income. In determining the 7-day effective
         yield, a class of a Fund will compute the "base period return" in the
         same manner used to compute the "current yield" over a 7 calendar-day
         period as described above. One is then added to the base period return
         and the sum is raised to the 365/7 power. One is subtracted from the
         result, according to the following formula:

                                                        (365/7)
            EFFECTIVE YIELD = [ (BASE PERIOD RETURN + 1)       ] - 1

         Based on these formulas, the current and effective yields were as
follows for the periods and Funds indicated:


                                       21
<PAGE>   169


<TABLE>
<CAPTION>
                                                                               Current yield for       Effective yield for
                                                     Current daily yield       the 7 day period         the 7 day period
                                                            as of                    ended                    ended
                                                      December 31, 1999        December 31, 1999        December 31, 1999
                                                     -------------------       -----------------        -----------------
<S>                                                  <C>                       <C>                      <C>
Institutional Class
    Money Market Fund                                       5.47%                    5.61%                    5.77%
    Municipal Money Market Fund                             4.61%                    4.34%                    4.43%
    U.S. Government Money Market Fund                       5.32%                    5.59%                    5.75%

PlanAhead Class
    Money Market Fund                                       5.15%                    5.29%                    5.43%
    Municipal Money Market Fund                             4.22%                    3.95%                    4.02%
    U.S. Government Money Market Fund                       4.85%                    5.13%                    5.26%
</TABLE>

         The Municipal Money Market Fund also may advertise a tax equivalent
current and effective yield. The tax equivalent yields are calculated as
follows:

      CURRENT YIELD/(1-APPLICABLE TAX RATE) = CURRENT TAX EQUIVALENT YIELD

    EFFECTIVE YIELD/(1-APPLICABLE TAX RATE) = EFFECTIVE TAX EQUIVALENT YIELD

Based on these formulas, the current and effective tax equivalent yields for the
Municipal Money Market Fund for the seven-day periods ending December 31, 1999
were:

<TABLE>
<CAPTION>
                                                                       Current                         Effective
Class                                                            Tax Equivalent Yield            Tax Equivalent Yield
- -----                                                            --------------------            --------------------
<S>                                                              <C>                             <C>
Institutional (based on a 35.0% corporate tax rate)                     6.68%                            6.82%
PlanAhead (based on a 39.6% personal tax rate)                          6.54%                            6.66%
</TABLE>

         The advertised yields for each class of the Variable NAV Funds (as
defined in the Prospectus) are computed by dividing the net investment income
per share earned during a 30-day (or one month) period less the aggregate fees
that are charged to all shareholder accounts of the class in proportion to the
30-day (or one month) period and the weighted average size of an account in that
class of a Fund by the maximum offering price per share of the class on the last
day of the period, according to the following formula:

                             YIELD = 2{(A-B +1)6- 1}
                                        ---
                                        CD

where, with respect to a particular class of a Fund, "a" is the dividends and
interest earned during the period; "b" is the sum of the expenses accrued for
the period (net of reimbursement, if any) and the aggregate fees that are
charged to all shareholder accounts in proportion to the 30-day (or one month)
period and the weighted average size of an account in the class; "c" is the
average daily number of class shares outstanding during the period that were
entitled to receive dividends; and "d" is the maximum offering price per class
share on the last day of the period. Based on this formula, the 30-day yield for
the period ended October 31, 1999 for the Short-Term Bond Fund was 6.74%, 6.57%
and 6.24%, for the AMR, Institutional and PlanAhead Classes, respectively. The
30-day yield for the period ended October 31, 1999 for the Intermediate Bond
Fund was 6.39%, 6.18% and 5.83%, for the AMR, Institutional and PlanAhead
Classes, respectively.

         Each class of the Intermediate Bond and the Short-Term Bond Fund also
may advertise a monthly distribution rate. The distribution rate gives the
return of the class based solely on the dividend payout to that class if someone
was entitled to the dividends for an entire month. A monthly distribution rate
is calculated from the following formula:

                     MONTHLY DISTRIBUTION RATE = A/P*(365/N)

where, with respect to a particular class of shares, "A" is the dividend accrual
per share during the month, "P" is the share price at the end of the month and
"N" is the number of days in the month. Based on this formula, the monthly
distribution rate for the AMR, Institutional and PlanAhead Classes of the
Short-Term Bond Fund for the month of October 1999 was 6.53%, 6.36% and 6.04%,
respectively. The monthly distribution rate for the AMR Institutional and
PlanAhead Classes of the Intermediate Bond Fund for the month of October 1999
was 6.39%,


                                       22
<PAGE>   170


6.19% and 5.84%, respectively. The "monthly distribution rate" is a
non-standardized performance calculation and when used in an advertisement will
be accompanied by the appropriate standardized SEC calculations.

         The advertised total return for a class of a Fund is calculated by
equating an initial amount invested in a class of a Fund to the ending
redeemable value, according to the following formula:

                                        (n)
                                P(1 + T)   = ERV

where "P" is a hypothetical initial payment of $1,000; "T" is the average annual
total return for the class; "n" is the number of years involved; and "ERV" is
the ending redeemable value of a hypothetical $1,000 payment made in the class
at the beginning of the investment period covered.

         Based on this formula, annualized total returns were as follows for the
periods and Funds indicated:

<TABLE>
<CAPTION>
                                                      For the           For the          For the        For the period from
                                                  one-year period      five-year     ten-year period      commencement of
                                                       ended:        period ended:        ended:         active operations
                                                                                                              through:
                                                    10/31/99(1)       10/31/99(1)      10/31/99(1)         10/31/99(1)(3)
                                                  ---------------    -------------   ---------------    -------------------
<S>                                               <C>                <C>             <C>                <C>
AMR Class
    Balanced Fund                                      0.83%            13.16%            11.06%               10.55%
    Large Cap Value Fund(7)                            1.97%            15.87%            12.82%               12.16%
    Small Cap Value Fund                               N/A(2)           N/A(2)            N/A(2)               -9.20%
    International Equity Fund                          20.27%           13.81%            N/A(2)               12.29%
    Intermediate Bond Fund                             -1.06%           N/A(2)            N/A(2)               5.01%
    Short-Term Bond Fund(8)                            2.83%             5.97%            6.46%                6.63%
Institutional Class
    Balanced Fund                                      0.53%            12.84%            10.90%               10.42%
    Large Cap Value Fund(7)                            1.72%            15.57%            12.67%               12.04%
    Small Cap Value Fund                               N/A(2)           N/A(2)            N/A(2)               -9.30%
    International Equity Fund                          19.98%           13.50%            N/A(2)               12.10%
    Intermediate Bond Fund                             -0.83%           N/A(2)            N/A(2)               5.13%
    Short-Term Bond Fund(8)                            2.56%             5.73%            6.32%                6.51%
PlanAhead Class
    Balanced Fund                                      0.22%            12.50%            10.73%               10.28%
    Large Cap Value Fund(7)                            1.41%            15.17%            12.46%               11.87%
    Small Cap Value Fund                               N/A(2)           N/A(2)            N/A(2)               -9.50%
    International Equity Fund                          19.68%           13.14%            N/A(2)               11.87%
    Intermediate Bond Fund                             -0.98%           N/A(2)            N/A(2)               4.91%
    Short-Term Bond Fund(6)(8)                         2.21%             5.46%            6.19%                6.40%

                                                    12/31/99(1)       12/31/99(1)      12/31/99(1)         12/31/99(1)(3)
                                                    -----------       -----------      -----------         --------------
Institutional Class
    S&P 500 Index Fund(4)                             20.70%            N/A(2)            N/A(2)               27.45%
    Money Market Fund                                  5.18%             5.58%            5.45%                6.00%
    Municipal Money Market Fund(5)                     3.00%             3.45%            N/A(2)               3.29%
    U.S. Gov't. Money Market Fund(9)                   5.06%             5.36%            N/A(2)               4.71%
PlanAhead Class
    S&P 500 Index Fund(4)                             20.24%            N/A(2)            N/A(2)               27.19%
    Money Market Fund                                  4.87%             5.26%            5.27%                5.85%
    Municipal Money Market Fund(5)                     2.74%             3.15%            N/A(2)               3.02%
    U.S. Gov't. Money Market Fund(9)                   4.66%             4.99%            N/A(2)               4.45%
</TABLE>

(1) The Institutional Class is the initial class for each Fund, except for the
S&P 500 Index Fund. Except for the S&P 500 Index Fund, total returns for the
PlanAhead and AMR Classes reflect Institutional Class returns from the date of
commencement of operations of each of these Funds and returns of the applicable
class from the commencement of operations of the new classes through the end of
each period. Due to the different expense structures between the classes, total
returns would vary from the results shown had the classes been in operation for
the entire periods.

(2) The Fund was not operational during this period.

(3) Inception dates are as follows:


                                       23
<PAGE>   171


<TABLE>
<CAPTION>
                        Fund                      Institutional Class     AMR Class    PlanAhead Class
                        ----                      -------------------     ---------    ---------------
<S>                                               <C>                     <C>          <C>
                     Balanced                          7/17/87              8/1/94           8/1/94
                     Large Cap Value                   7/17/87              8/1/94           8/1/94
                     Small Cap Value                   12/31/98             3/1/99           3/1/99
                     International Equity               8/7/91              8/1/94           8/1/94
                     S&P 500 Index(4)                   1/1/97                N/A            3/1/98
                     Intermediate Bond                 9/15/97              3/1/99           3/1/98
                     Short-Term Bond                   12/3/87              8/1/94           8/1/94
                     Money Market                       9/1/87                N/A            8/1/94
                     Municipal Money Market            11/10/93               N/A            8/1/94
                     U.S. Government Money Market       3/2/92                N/A            8/1/94
</TABLE>

(4)   On March 1, 1998, the S&P 500 Index Fund-AMR Class was redesignated the
      S&P 500 Index Fund-Institutional Class.

(5)   A portion of the Management and Administrative Services fees has been
      waived for the Municipal Money Market Fund since its inception.

(6)   A portion of the Service Plan Fees of the PlanAhead Class has been waived
      for the Short-Term Bond Fund since August 1, 1994.

(7)   Prior to March 1, 1999, the Large Cap Value Fund was known as the Growth
      and Income Fund and operated under different investment policies.

(8)   Prior to March 1, 1998, the Short-Term Bond Fund was known as the
      Limited-Term Income Fund.

(9)   Prior to March 1, 1997, the U.S. Government Money Market Fund was known as
      the U.S. Treasury Money Market Fund and operated under different
      investment policies.

See Appendix A for historical performance of the S&P 500 Composite Stock Price
Index.

         Each class of a Fund also may use "aggregate" total return figures for
various periods that represent the cumulative change in value of an investment
in a class of a Fund for the specific period. Such total returns reflect changes
in share prices of a class of a Fund and assume reinvestment of dividends and
distributions.

         Each Fund may give total returns from inception using the date when the
current managers began active management as the inception date. However, returns
using the actual inception date of the Fund also will be provided.

         In reports or other communications to shareholders or in advertising
material, each class of a Fund may from time to time compare its performance
with that of other mutual funds in rankings prepared by Lipper Analytical
Services, Inc., Morningstar, Inc., IBC Financial Data, Inc. and other similar
independent services which monitor the performance of mutual funds or
publications such as the "New York Times," "Barrons" and the "Wall Street
Journal." Each class of a Fund may also compare its performance with various
indices prepared by independent services such as Standard & Poor's, Merrill
Lynch, Morgan Stanley or Lehman Brothers or to unmanaged indices that may assume
reinvestment of dividends but generally do not reflect deductions for
administrative and management costs.

         Each Fund may advertise the standard deviation of its returns for
various time periods and compare its standard deviation to that of various
indices. Standard deviation of returns over time is a measure of volatility. It
indicates the spread of a Fund's returns about their central tendency or mean.
In theory, a Fund that is more volatile should receive a higher return in
exchange for taking extra risk. Standard deviation is a well-accepted statistic
to gauge the riskiness of an investment strategy and measure its historical
volatility as a predictor of risk, although the measure is subject to time
selection bias.

         Advertisements for the Funds may mention that the Funds offer a variety
of investment options. They may also compare the Funds to federally insured
investments such as bank certificates of deposit and credit union deposits,
including the long-term effects of inflation on these types of investments.
Advertisements may also compare the historical rate of return of different types
of investments. Advertisements for the International Equity Fund may compare the
differences between domestic and foreign investments. Information concerning
broker-dealers who sell the Funds may also appear in advertisements for the
Funds, including their ranking as established by various publications compared
to other broker-dealers.

         From time to time, the Manager may use contests as a means of promoting
the American AAdvantage Funds. Prizes may include free air travel and/or hotel
accommodations. Listings for certain of the Funds may be found in newspapers
under the heading "Amer AAdvant."


                                       24
<PAGE>   172


                            DESCRIPTION OF THE TRUST

         The Trust is an entity of the type commonly known as a "Massachusetts
business trust." Under Massachusetts law, shareholders of such a trust may,
under certain circumstances, be held personally liable for its obligations.
However, the Trust's Declaration of Trust contains an express disclaimer of
shareholder liability for acts or obligations of the Trust and provides for
indemnification and reimbursement of expenses out of Trust property for any
shareholder held personally liable for the obligations of the Trust. The
Declaration of Trust also provides that the Trust may maintain appropriate
insurance (for example, fidelity bonding) for the protection of the Trust, its
shareholders, Trustees, officers, employees and agents to cover possible tort
and other liabilities. Thus, the risk of a shareholder incurring financial loss
due to shareholder liability is limited to circumstances in which both
inadequate insurance existed and the Trust itself was unable to meet its
obligations. The Trust has not engaged in any other business.

         The Trust was originally created to manage money for large
institutional investors, including pension and 401(k) plans for American
Airlines, Inc. The AMR Class is offered to tax-exempt retirement and benefit
plans of AMR Corporation and its affiliates. The following individuals are
eligible for purchasing shares of the Institutional Class with an initial
investment of less than $2 million: (i) employees of the Manager, (ii) officers
and directors of AMR and (iii) members of the Trust's Board of Trustees. The
PlanAhead Class was later created to give individuals and other smaller
investors an opportunity to invest in the American AAdvantage Funds. As a
result, shareholders of the PlanAhead Class benefit from the economies of scale
generated by being part of a larger pool of assets.

         The corresponding Portfolios of the Balanced, the Large Cap Value, the
International Equity, the Small Cap Value and the Intermediate Bond and
Short-Term Bond Funds utilize a multi-manager approach designed to reduce
volatility by diversifying assets over multiple investment management firms.
Each adviser is carefully chosen by the Manager through a rigorous screening
process.

                                OTHER INFORMATION

         American Depositary Receipts (ADRs), European Depositary Receipts
(EDRs)-ADRs are depositary receipts for foreign issuers in registered form
traded in U.S. securities markets, whereas, EDRs are in bearer form and traded
in European securities markets. These securities are not denominated in the same
currency as the securities into which they may be converted. Investing in ADRs
and EDRs involves greater risks than are normally present in domestic
investments. There is generally less publicly available information about
foreign companies and there may be less governmental regulation and supervision
of foreign stock exchanges, brokers and listed companies. In addition, such
companies may use different accounting and financial standards (and certain
currencies may become unavailable for transfer from a foreign currency),
resulting in a Fund's possible inability to convert immediately into U.S.
currency proceeds realized upon the sale of portfolio securities of the affected
foreign companies.

         Asset-Backed Securities-Through the use of trusts and special purpose
subsidiaries, various types of assets (primarily home equity loans, automobile
and credit card receivables, other types of receivables/assets as well as
purchase contracts, financing leases and sales agreements entered into by
municipalities) are securitized in pass-through structures similar to
Mortgage-Backed Securities, as described below. The Portfolios are permitted to
invest in asset-backed securities, subject to the Portfolios' rating and quality
requirements.

         Bank Deposit Notes-Bank deposit notes are obligations of a bank, rather
than bank holding company corporate debt. The only structural difference between
bank deposit notes and certificates of deposit is that interest on bank deposit
notes is calculated on a 30/360 basis, as are corporate notes/bonds. Similar to
certificates of deposit, deposit notes represent bank level investments and,
therefore, are senior to all holding company corporate debt.

         Bankers' Acceptances-Bankers' acceptances are short-term credit
instruments designed to enable businesses to obtain funds to finance commercial
transactions. Generally, an acceptance is a time draft drawn on a bank by an
exporter or an importer to obtain a stated amount of funds to pay for specific
merchandise. The draft is then "accepted" by a bank that, in effect,
unconditionally guarantees to pay the face value of the instrument on its
maturity date. The acceptance may then be held by the accepting bank as an
earning asset or it may be sold in the secondary market at the going rate of
discount for a specific maturity. Although maturities for acceptances can be as
long as 270 days, most acceptances have maturities of six months or less.

         Cash Equivalents-Cash equivalents include certificates of deposit,
bearer deposit notes, bankers' acceptances, government obligations, commercial
paper, short-term corporate debt securities and repurchase agreements.


                                       25
<PAGE>   173


         Certificates of Deposit-Certificates of deposit are issued against
funds deposited in an eligible bank (including its domestic and foreign
branches, subsidiaries and agencies), are for a definite period of time, earn a
specified rate of return and are normally negotiable.

         Cover-Transactions using forward contracts, futures contracts, options
on futures contracts and options on indices ("Financial Instruments"), other
than purchased options, expose a Portfolio to an obligation to another party. A
Portfolio will not enter into any such transactions unless it owns either (1) an
offsetting ("covered") position in securities, currencies, or other forward
contracts, options or futures contracts, or (2) cash, receivables and liquid
assets, with a value, marked-to-market daily, sufficient to cover its potential
obligations to the extent not covered as provided in (1) above. Each Portfolio
will comply with SEC guidelines regarding cover for these instruments and will,
if the guidelines so require, set aside cash, receivables, or liquid assets in a
segregated account with its custodian in the prescribed amount.

         Assets used as cover or held in a segregated account cannot be sold
while the position in the corresponding Financial Instrument is open, unless
they are replaced with other appropriate assets. As a result, the commitment of
a large portion of a Portfolio's assets to cover or to segregated accounts could
impede portfolio management or the Portfolio's ability to meet redemption
requests or other current obligations.

         Commercial Paper-Commercial paper refers to promissory notes
representing an unsecured debt of a corporation or finance company with a fixed
maturity of no more than 270 days. A variable amount master demand note (which
is a type of commercial paper) represents a direct borrowing arrangement
involving periodically fluctuating rates of interest under a letter agreement
between a commercial paper issuer and an institutional lender pursuant to which
the lender may determine to invest varying amounts.

         Debentures-Debentures are unsecured debt securities. The holder of a
debenture is protected only by the general creditworthiness of the issuer.

         Derivatives-Generally, a derivative is a financial arrangement, the
value of which is based on, or "derived" from, a traditional security, asset or
market index. Some "derivatives" such as mortgage-related and other asset-backed
securities are in many respects like any other investment, although they may be
more volatile or less liquid than more traditional debt securities. There are,
in fact, many different types of derivatives and many different ways to use
them. There are a range of risks associated with those uses.

         Dollar Rolls-A dollar roll is a contract to sell mortgage-backed
securities as collateral against a commitment to repurchase similar, but not
identical, mortgage-backed securities on a specified future date. The other
party to the contract is entitled to all principal, interest, and prepayment
cash flows while it holds the collateral. Each Portfolio maintains with the
Custodian a segregated account containing high-grade liquid securities in an
amount at least equal to the forward purchase obligation.

         Eurodollar and Yankeedollar obligations-Eurodollar obligations are U.S.
dollar obligations issued outside the United States by domestic or foreign
entities, while Yankeedollar obligations are U.S. dollar obligations issued
inside the United States by foreign entities. There is generally less publicly
available information about foreign issuers and there may be less governmental
regulation and supervision of foreign stock exchanges, brokers and listed
companies. Foreign issuers may use different accounting and financial standards,
and the addition of foreign governmental restrictions may affect adversely the
payment of principal and interest on foreign investments. In addition, not all
foreign branches of United States banks are supervised or examined by regulatory
authorities as are United States banks, and such branches may not be subject to
reserve requirements.

         Forward Foreign Currency Exchange Contracts-A forward foreign currency
exchange contract ("forward contract") is a contract to purchase or sell a
currency at a future date. The two parties to the contract set the number of
days and the price. Forward contracts are used as a hedge against movements in
future foreign exchange rates. The corresponding Portfolio of the International
Equity Fund may enter into forward contracts to purchase or sell foreign
currencies for a fixed amount of U.S. dollars or other foreign currency.

         Forward contracts may serve as long hedges -- for example, the
Portfolio may purchase a forward contract to lock in the U.S. dollar price of a
security denominated in a foreign currency that the Portfolio intends to
acquire. Forward contracts may also serve as short hedges -- for example, the
Portfolio may sell a forward contract to lock in the U.S. dollar equivalent of
the proceeds from the anticipated sale of a security denominated


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in a foreign currency or from the anticipated dividend or interest payments
denominated in a foreign currency. The Manager may seek to hedge against changes
in the value of a particular currency by using forward contracts on another
foreign currency or basket of currencies, the value of which the Manager
believes will bear a positive correlation to the value of the currency being
hedged.

         The cost to the Portfolio of engaging in forward contracts varies with
factors such as the currency involved, the length of the contract period and the
market conditions then prevailing. Because forward contracts are usually entered
into on a principal basis, no fees or commissions are involved. When the
Portfolio enters into a forward contract, it relies on the contra party to make
or take delivery of the underlying currency at the maturity of the contract.
Failure by the contra party to do so would result in the loss of any expected
benefit of the transaction.

         Buyers and sellers of forward contracts can enter into offsetting
closing transactions by selling or purchasing, respectively, an instrument
identical to the instrument purchased or sold. Secondary markets generally do
not exist for forward contracts, with the result that closing transactions
generally can be made for forward contracts only by negotiating directly with
the contra party. Thus, there can be no assurance that the Portfolio will in
fact be able to close out a forward contract at a favorable price prior to
maturity. In addition, in the event of insolvency of the contra party, the
Portfolio might be unable to close out a forward contract at any time prior to
maturity. In either event, the Portfolio would continue to be subject to market
risk with respect to the position, and would continue to be required to maintain
a position in the securities or currencies that are the subject of the hedge or
to maintain cash or securities in a segregated account.

         The precise matching of forward currency contract amounts and the value
of the securities involved generally will not be possible because the value of
such securities, measured in the foreign currency, will change after the forward
contract has been established. Thus, the Portfolio might need to purchase or
sell foreign currencies in the spot (cash) market to the extent such foreign
currencies are not covered by forward contracts. The projection of short-term
currency market movements is extremely difficult, and the successful execution
of a short-term hedging strategy is highly uncertain.

         Full Faith and Credit Obligations of the U.S. Government-Securities
issued or guaranteed by the U.S. Treasury, backed by the full taxing power of
the U.S. Government or the right of the issuer to borrow from the U.S. Treasury.

         Futures Contracts-Futures contracts obligate a purchaser to take
delivery of a specific amount of an obligation underlying the futures contract
at a specified time in the future for a specified price. Likewise, the seller
incurs an obligation to deliver the specified amount of the underlying
obligation against receipt of the specified price. Futures are traded on both
U.S. and foreign commodities exchanges. Futures contracts will be traded for the
same purposes as entering into forward contracts. The use of futures contracts
by the Equity 500 Index Portfolio is explained further under "Index Futures
Contracts and Options on Index Futures Contracts."

         The purchase of futures can serve as a long hedge, and the sale of
futures can serve as a short hedge.

         No price is paid upon entering into a futures contract. Instead, at the
inception of a futures contract a Portfolio is required to deposit "initial
deposit" consisting of cash or U.S. Government Securities in an amount generally
equal to 10% or less of the contract value. Margin must also be deposited when
writing a call or put option on a futures contract, in accordance with
applicable exchange rules. Unlike margin in securities transactions, initial
margin on futures contracts does not represent a borrowing, but rather is in the
nature of a performance bond or good-faith deposit that is returned to the
Portfolio at the termination of the transaction if all contractual obligations
have been satisfied. Under certain circumstances, such as periods of high
volatility, a Portfolio may be required by a futures exchange to increase the
level of its initial margin payment, and initial margin requirements might be
increased generally in the future by regulatory action.

         Subsequent "variation margin" payments are made to and from the futures
broker daily as the value of the futures position varies, a process known as
"marking-to-market." Variation margin does not involve borrowing, but rather
represents a daily settlement of a Portfolio's obligations to or from a futures
broker. When the Portfolio purchases or sells a futures contract, it is subject
to daily variation margin calls that could be substantial in the event of
adverse price movements. If a Portfolio has insufficient cash to meet daily
variation margin requirements, it might need to sell securities at a time when
such sales are disadvantageous.


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         Purchasers and sellers of futures contracts can enter into offsetting
closing transactions, by selling or purchasing, respectively, an instrument
identical to the instrument purchased or sold. Positions in futures contracts
may be closed only on a futures exchange or board of trade that provides a
secondary market. The Portfolios intend to enter into futures contracts only on
exchanges or boards of trade where there appears to be a liquid secondary
market. However, there can be no assurance that such a market will exist for a
particular contract at a particular time. In such event, it may not be possible
to close a futures contract.

         Although futures contracts by their terms call for the actual delivery
or acquisition of securities or currency, in most cases the contractual
obligation is fulfilled before the date of the contract without having to make
or take delivery of the securities or currency. The offsetting of a contractual
obligation is accomplished by buying (or selling, as appropriate) on a
commodities exchange an identical futures contract calling for delivery in the
same month. Such a transaction, which is effected through a member of an
exchange, cancels the obligation to make or take delivery of the securities or
currency. Since all transactions in the futures market are made, offset or
fulfilled through a clearinghouse associated with the exchange on which the
contracts are traded, a Portfolio will incur brokerage fees when it purchases or
sells futures contracts.

         Under certain circumstances, futures exchanges may establish daily
limits on the amount that the price of a futures contract can vary from the
previous day's settlement price; once that limit is reached, no trades may be
made that day at a price beyond the limit. Daily price limits do not limit
potential losses because prices could move to the daily limit for several
consecutive days with little or no trading, thereby preventing liquidation of
unfavorable positions.

         If a Portfolio were unable to liquidate a futures contract due to the
absence of a liquid secondary market or the imposition of price limits, it could
incur substantial losses. The Portfolio would continue to be subject to market
risk with respect to the position. In addition, the Portfolio would continue to
be required to make daily variation margin payments and might be required to
maintain the position being hedged by the futures contract or option thereon or
to maintain cash or securities in a segregated account.

         To the extent that a Portfolio enters into futures contracts, in each
case other than for bona fide hedging purposes (as defined by the Commodities
Futures Trading Commission ("CFTC")), the aggregate initial margin will not
exceed 5% of the liquidation value of a Portfolio's portfolio, after taking into
account unrealized profits and unrealized losses on any contracts that the
Portfolio has entered into. This policy does not limit to 5% the percentage of
the Portfolio's assets that are at risk in futures contracts.

         Futures contracts require the deposit of initial margin valued at a
certain percentage of the contract and possibly adding "variation margin" should
the price of the contract move in an unfavorable direction. As with forward
contracts, the segregated assets must be either cash or high-grade liquid debt
securities.

         The ordinary spreads between prices in the cash and futures market, due
to differences in the nature of those markets, are subject to distortions.
First, all participants in the futures market are subject to initial deposit and
variation margin requirements. Rather than meeting additional variation margin
deposit requirements, investors may close futures contracts through offsetting
transactions that could distort the normal relationship between the cash and
futures markets. Second, the liquidity of the futures market depends on
participants entering into offsetting transactions rather than making or taking
delivery. To the extent participants decide to make or take delivery, liquidity
in the futures market could be reduced, thus producing distortion. Third, from
the point of view of speculators, the margin deposit requirements in the futures
market are less onerous than margin requirements in the securities market.
Therefore, increased participation by speculators in the futures market may
cause temporary price distortions. Due to the possibility of distortion, a
correct forecast of securities price or currency exchange rate trends by the
investment adviser may still not result in a successful transaction.

         In addition, futures contracts entail risks. Although an investment
adviser believes that use of such contracts will benefit a particular Portfolio,
if that investment adviser's investment judgment about the general direction of,
for example, an index is incorrect, a Portfolio's overall performance would be
worse than if it had not entered into any such contract. In addition, there are
differences between the securities and futures markets that could result in an
imperfect correlation between the markets, causing a given transaction not to
achieve its objectives.

         General Obligation Bonds-General obligation bonds are secured by the
pledge of the issuer's full faith, credit, and usually, taxing power. The taxing
power may be an unlimited ad valorem tax or a limited tax, usually on real
estate and personal property. Most states do not tax real estate, but leave that
power to local units of government.


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<PAGE>   176


         Illiquid Securities-Historically, illiquid securities have included
securities subject to contractual or legal restrictions on resale because they
have not been registered under the 1933 Act, securities that are otherwise not
readily marketable and repurchase agreements having a remaining maturity of
longer than seven calendar days. Securities that have not been registered under
the 1933 Act are referred to as private placements or restricted securities and
are purchased directly from the issuer or in the secondary market. Mutual funds
do not typically hold a significant amount of these restricted or other illiquid
securities because of the potential for delays on resale and uncertainty in
valuation. Limitations on resale may have an adverse effect on the marketability
of portfolio securities and a mutual fund might be unable to dispose of
restricted or other illiquid securities promptly or at reasonable prices and
might thereby experience difficulty satisfying redemptions within seven calendar
days. A mutual fund also might have to register such restricted securities in
order to dispose of them resulting in additional expense and delay. Adverse
market conditions could impede such a public offering of securities.

         In recent years, however, a large institutional market has developed
for certain securities that are not registered under the 1933 Act, including
repurchase agreements, commercial paper, foreign securities, municipal
securities and corporate bonds and notes. Institutional investors depend on an
efficient institutional market in which the unregistered security can be readily
resold or on an issuer's ability to honor a demand for repayment. However, the
fact that there are contractual or legal restrictions on resale of such
investments to the general public or to certain institutions may not be
indicative of their liquidity.

         Index Futures Contracts and Options on Index Futures Contracts-The
Balanced, Large Cap Value, Small Cap Value, International Equity, and Equity 500
Index Portfolios (the "Portfolios") may invest in index futures contracts,
options on index futures contracts and options on securities indices.

                  Index Futures Contracts-U.S. futures contracts have been
         designed by exchanges which have been designated "contracts markets" by
         the CFTC and must be executed through a futures commission merchant, or
         brokerage firm, which is a member of the relevant contract market.
         Futures contracts trade on a number of exchange markets, and through
         their clearing corporations.

                  At the same time a futures contract on the Standard & Poor's
         500 Composite Stock Price Index (the "S&P 500" or the "Index") is
         purchased or sold, the Portfolio must allocate cash or securities as a
         deposit payment ("initial deposit"). It is expected that the initial
         deposit would be approximately 1-1/2% to 5% of a contract's face value.
         Daily thereafter, the futures contract is valued and the payment of
         "variation margin" may be required.

                  Options on Index Futures Contracts-The purchase of a call
         option on an index futures contract is similar in some respects to the
         purchase of a call option on such an index.

                  The writing of a call option on a futures contract with
         respect to the Index constitutes a partial hedge against declining
         prices of the underlying securities that are deliverable upon exercise
         of the futures contract. If the futures price at expiration of the
         option is below the exercise price, the Portfolio will retain the full
         amount of the option premium, which provides a partial hedge against
         any decline that may have occurred in the Portfolio's holdings. The
         writing of a put option on an index futures contract constitutes a
         partial hedge against increasing prices of the underlying securities
         that are deliverable upon exercise of the futures contract. If the
         futures price at expiration of the option is higher than the exercise
         price, the Portfolio will retain the full amount of the option premium,
         which provides a partial hedge against any increase in the price of
         securities that the Portfolio intends to purchase. If a put or call
         option the Portfolio has written is exercised, the Portfolio will incur
         a loss that will be reduced by the amount of the premium it receives.
         Depending on the degree of correlation between changes in the value of
         its portfolio securities and changes in the value of its futures
         positions, the Portfolio's losses from existing options on futures may
         to some extent be reduced or increased by changes in the value of
         portfolio securities.

                  The purchase of a put option on a futures contract with
         respect to the Index is similar in some respects to the purchase of
         protective put options on the Index. For example, the Portfolio may
         purchase a put option on an index futures contract to hedge against the
         risk of lowering securities values.

                  The amount of risk the Portfolio assumes when it purchases an
         option on a futures contract with respect to the Index is the premium
         paid for the option plus related transaction costs. In addition to the
         correlation risks discussed above, the purchase of such an option also
         entails the risk that changes in the


                                       29
<PAGE>   177


         value of the underlying futures contract will not be fully reflected in
         the value of the option purchased.

                  The Equity 500 Index Portfolio Board has adopted the
         requirement that index futures contracts and options on index futures
         contracts be used as a hedge. Stock index futures may be used on a
         continual basis to equitize cash so that the Portfolios may maintain
         maximum equity exposure. Each Portfolio will not enter into any futures
         contracts or options on futures contracts if immediately thereafter the
         amount of margin deposits on all the futures contracts of the Portfolio
         and premiums paid on outstanding options on futures contracts owned by
         the Portfolio would exceed 5% of the market value of the total assets
         of the Portfolio.

                  Futures Contracts on Stock Indices-The Portfolios may enter
         into contracts providing for the making and acceptance of a cash
         settlement based upon changes in the value of an index of securities
         ("Futures Contracts"). This investment technique is designed only to
         hedge against anticipated future change in general market prices which
         otherwise might either adversely affect the value of securities held by
         the Portfolios or adversely affect the prices of securities which are
         intended to be purchased at a later date for the Portfolios.

                  In general, each transaction in Futures Contracts involves the
         establishment of a position that will move in a direction opposite to
         that of the investment being hedged. If these hedging transactions are
         successful, the futures positions taken for the Portfolios will rise in
         value by an amount that approximately offsets the decline in value of
         the portion of the Portfolios' investments that are being hedged.
         Should general market prices move in an unexpected manner, the full
         anticipated benefits of Futures Contracts may not be achieved or a loss
         may be realized.

                  Although Futures Contracts would be entered into for cash
         management purposes only, such transactions do involve certain risks.
         These risks could include a lack of correlation between the Futures
         Contract and the equity market, a potential lack of liquidity in the
         secondary market and incorrect assessments of market trends, which may
         result in worse overall performance than if a Futures Contract had not
         been entered into.

                  Brokerage costs will be incurred and "margin" will be required
         to be posted and maintained as a good-faith deposit against performance
         of obligations under Futures Contracts written into by the Portfolios.
         Each Portfolio may not purchase or sell a Futures Contract (or options
         thereon) if immediately thereafter its margin deposits on its
         outstanding Futures Contracts (and its premium paid on outstanding
         options thereon) would exceed 5% of the market value of each
         Portfolio's total assets.

                  Options on Securities Indices-The Portfolios may write (sell)
         covered call and put options to a limited extent on the Index ("covered
         options") in an attempt to increase income. Such options give the
         holder the right to receive a cash settlement during the term of the
         option based upon the difference between the exercise price and the
         value of the Index. The Portfolios may forgo the benefits of
         appreciation on the Index or may pay more than the market price or the
         Index pursuant to call and put options written by the Portfolios.

                  By writing a covered call option, the Portfolios forgo, in
         exchange for the premium less the commission ("net premium"), the
         opportunity to profit during the option period from an increase in the
         market value of the Index above the exercise price. By writing a
         covered put option, the Portfolios, in exchange for the net premium
         received, accept the risk of a decline in the market value of the Index
         below the exercise price.

                  Each Portfolio may terminate its obligation as the writer of a
         call or put option by purchasing an option with the same exercise price
         and expiration date as the option previously written.

                  When each Portfolio writes an option, an amount equal to the
         net premium received by the Portfolio is included in the liability
         section of the Portfolio's Statement of Assets and Liabilities as a
         deferred credit. The amount of the deferred credit will be subsequently
         marked to market to reflect the current market value of the option
         written. The current market value of a traded option is the last sale
         price or, in the absence of a sale, the mean between the closing bid
         and asked price. If an option expires on its stipulated expiration date
         or if the Portfolio enters into a closing purchase transaction, the
         Portfolio will realize a gain (or loss if the cost of a closing
         purchase transaction exceeds the premium received when the option was
         sold), and the deferred credit related to such option will be
         eliminated.


                                       30
<PAGE>   178


                  The Portfolios have adopted certain other nonfundamental
         policies concerning index option transactions that are discussed above.
         The Portfolios' activities in index options also may be restricted by
         the requirements of the Code, for qualification as a RIC.

                  The hours of trading for options on the Index may not conform
         to the hours during which the underlying securities are traded. To the
         extent that the option markets close before the markets for the
         underlying securities, significant price and rate movements can take
         place in the underlying securities markets that cannot be reflected in
         the option markets. It is impossible to predict the volume of trading
         that may exist in such options, and there can be no assurance that
         viable exchange markets will develop or continue.

                  Because options on securities indices require settlement in
         cash, State Street may be forced to liquidate portfolio securities to
         meet settlement obligations.

                  Options on Stock Indices-The Portfolio may purchase and write
         put and call options on stock indices listed on stock exchanges. A
         stock index fluctuates with changes in the market values of the stocks
         included in the index. Options on stock indices generally are similar
         to options on stock except that the delivery requirements are
         different. Instead of giving the right to take or make delivery of
         stock at a specified price, an option on a stock index gives the holder
         the right to receive a cash "exercise settlement amount" equal to (a)
         the amount, if any, by which the fixed exercise price of the option
         exceeds (in the case of a put) or is less than (in the case of a call)
         the closing value of the underlying index on the date of exercise,
         multiplied by (b) a fixed "index multiplier." The writer of the option
         is obligated, in return for the premium received, to make delivery of
         this amount. The writer may offset its position in stock index options
         prior to expiration by entering into a closing transaction on an
         exchange or the option may expire unexercised.

                  Because the value of an index option depends upon movements in
         the level of the index rather than the price of a particular stock,
         whether the Portfolio will realize a gain or loss from the purchase or
         writing of options on an index depends upon movements in the level of
         stock prices in the stock market generally or, in the case of certain
         indices, in an industry or market segment, rather than movements in the
         price of a particular stock.

         Loan Participation Interests-Loan participation interests represent
interests in bank loans made to corporations. The contractual arrangement with
the bank transfers the cash stream of the underlying bank loan to the
participating investor. Because the issuing bank does not guarantee the
participations, they are subject to the credit risks generally associated with
the underlying corporate borrower. In addition, because it may be necessary
under the terms of the loan participation for the investor to assert through the
issuing bank such rights as may exist against the underlying corporate borrower,
in the event the underlying corporate borrower fails to pay principal and
interest when due, the investor may be subject to delays, expenses and risks
that are greater than those that would have been involved if the investor had
purchased a direct obligation (such as commercial paper) of such borrower.
Moreover, under the terms of the loan participation, the investor may be
regarded as a creditor of the issuing bank (rather than of the underlying
corporate borrower), so that the issuer may also be subject to the risk that the
issuing bank may become insolvent. Further, in the event of the bankruptcy or
insolvency of the corporate borrower, the loan participation may be subject to
certain defenses that can be asserted by such borrower as a result of improper
conduct by the issuing bank. The secondary market, if any, for these loan
participations is extremely limited and any such participations purchased by the
investor are regarded as illiquid.

         Loan Transactions-Loan transactions involve the lending of securities
to a broker-dealer or institutional investor for its use in connection with
short sales, arbitrages or other security transactions. The purpose of a
qualified loan transaction is to afford a lender the opportunity to continue to
earn income on the securities loaned and at the same time earn fee income or
income on the collateral held by it.

         Securities loans will be made in accordance with the following
conditions: (1) the Portfolio must receive at least 100% collateral in the form
of cash or cash equivalents, securities of the U.S. Government and its agencies
and instrumentalities, and approved bank letters of credit; (2) the borrower
must increase the collateral whenever the market value of the loaned securities
(determined on a daily basis) rises above the level of collateral; (3) the
Portfolio must be able to terminate the loan after notice, at any time; (4) the
Portfolio must receive reasonable interest on the loan or a flat fee from the
borrower, as well as amounts equivalent to any


                                       31
<PAGE>   179


dividends, interest or other distributions on the securities loaned, and any
increase in market value of the loaned securities; (5) the Portfolio may pay
only reasonable custodian fees in connection with the loan; and (6) voting
rights on the securities loaned may pass to the borrower, provided, however,
that if a material event affecting the investment occurs, the AMR Trust Board or
the Equity 500 Index Portfolio Board, as appropriate, must be able to terminate
the loan and vote proxies or enter into an alternative arrangement with the
borrower to enable the AMR Trust Board or the Equity 500 Index Portfolio Board,
as appropriate, to vote proxies.

         While there may be delays in recovery of loaned securities or even a
loss of rights in collateral supplied should the borrower fail financially,
loans will be made only to firms deemed by the AMR Trust Board to be of good
financial standing and will not be made unless the consideration to be earned
from such loans would justify the risk. If the borrower of the securities fails
financially, there is a risk of delay in recovery of the securities loaned or
loss of rights in the collateral. Such loan transactions are referred to in this
Statement of Additional Information as "qualified" loan transactions.

         The cash collateral so acquired through qualified loan transactions may
be invested only in those categories of high quality liquid securities
previously authorized by the AMR Trust Board or the Equity 500 Index Portfolio
Board, as appropriate.

         Mortgage-Backed Securities-Mortgage-backed securities consist of both
collateralized mortgage obligations and mortgage pass-through certificates.

                  Collateralized Mortgage Obligations ("CMOs")-CMOs and
         interests in real estate mortgage investment conduits ("REMICs") are
         debt securities collateralized by mortgages, or mortgage pass-through
         securities. CMOs divide the cash flow generated from the underlying
         mortgages or mortgage pass-through securities into different groups
         referred to as "tranches," which are then retired sequentially over
         time in order of priority. The principal governmental issuers of such
         securities are the Federal National Mortgage Association ("FNMA"), a
         government sponsored corporation owned entirely by private stockholders
         and the Federal Home Loan Mortgage Corporation ("FHLMC"), a corporate
         instrumentality of the United States created pursuant to an act of
         Congress which is owned entirely by Federal Home Loan Banks. The
         issuers of CMOs are structured as trusts or corporations established
         for the purpose of issuing such CMOs and often have no assets other
         than those underlying the securities and any credit support provided. A
         REMIC is a mortgage securities vehicle that holds residential or
         commercial mortgages and issues securities representing interests in
         those mortgages. A REMIC may be formed as a corporation, partnership,
         or segregated pool of assets. The REMIC itself is generally exempt from
         federal income tax, but the income from the mortgages is reported by
         investors. For investment purposes, interests in REMIC securities are
         virtually indistinguishable from CMOs.

                  Mortgage Pass-Through Certificates-Mortgage pass-through
         certificates are issued by governmental, government-related and private
         organizations which are backed by pools of mortgage loans.

                  (1) Government National Mortgage Association ("GNMA") Mortgage
         Pass-Through Certificates ("Ginnie Maes")-GNMA is a wholly owned U.S.
         Government corporation within the Department of Housing and Urban
         Development. Ginnie Maes represent an undivided interest in a pool of
         mortgages that are insured by the Federal Housing Administration or the
         Farmers Home Administration or guaranteed by the Veterans
         Administration. Ginnie Maes entitle the holder to receive all payments
         (including prepayments) of principal and interest owed by the
         individual mortgagors, net of fees paid to GNMA and to the issuer which
         assembles the mortgage pool and passes through the monthly mortgage
         payments to the certificate holders (typically, a mortgage banking
         firm), regardless of whether the individual mortgagor actually makes
         the payment. Because payments are made to certificate holders
         regardless of whether payments are actually received on the underlying
         mortgages, Ginnie Maes are of the "modified pass-through" mortgage
         certificate type. The GNMA is authorized to guarantee the timely
         payment of principal and interest on the Ginnie Maes. The GNMA
         guarantee is backed by the full faith and credit of the United States,
         and the GNMA has unlimited authority to borrow funds from the U.S.
         Treasury to make payments under the guarantee. The market for Ginnie
         Maes is highly liquid because of the size of the market and the active
         participation in the secondary market of security dealers and a variety
         of investors.

                  (2) FHLMC Mortgage Participation Certificates ("Freddie
         Macs")-Freddie Macs represent interests in groups of specified first
         lien residential conventional mortgages underwritten and owned by


                                       32
<PAGE>   180


         the FHLMC. Freddie Macs entitle the holder to timely payment of
         interest, which is guaranteed by the FHLMC. The FHLMC guarantees either
         ultimate collection or timely payment of all principal payments on the
         underlying mortgage loans. In cases where the FHLMC has not guaranteed
         timely payment of principal, the FHLMC may remit the amount due because
         of its guarantee of ultimate payment of principal at any time after
         default on an underlying mortgage, but in no event later than one year
         after it becomes payable. Freddie Macs are not guaranteed by the United
         States or by any of the Federal Home Loan Banks and do not constitute a
         debt or obligation of the United States or of any Federal Home Loan
         Bank. The secondary market for Freddie Macs is highly liquid because of
         the size of the market and the active participation in the secondary
         market of the FHLMC, security dealers and a variety of investors.

                  (3) FNMA Guaranteed Mortgage Pass-Through Certificates
         ("Fannie Maes")-Fannie Maes represent an undivided interest in a pool
         of conventional mortgage loans secured by first mortgages or deeds of
         trust, on one family or two to four family, residential properties. The
         FNMA is obligated to distribute scheduled monthly installments of
         principal and interest on the mortgages in the pool, whether or not
         received, plus full principal of any foreclosed or otherwise liquidated
         mortgages. The obligation of the FNMA under its guarantee is solely its
         obligation and is not backed by, nor entitled to, the full faith and
         credit of the United States.

                  (4) Mortgage-Related Securities Issued by Private
         Organizations-Pools created by non-governmental issuers generally offer
         a higher rate of interest than government and government-related pools
         because there are no direct or indirect government guarantees of
         payments in such pools. However, timely payment of interest and
         principal of these pools is often partially supported by various
         enhancements such as over-collateralization and senior/subordination
         structures and by various forms of insurance or guarantees, including
         individual loan, title, pool and hazard insurance. The insurance and
         guarantees are issued by government entities, private insurers or the
         mortgage poolers. Although the market for such securities is becoming
         increasingly liquid, securities issued by certain private organizations
         may not be readily marketable.

         Municipal Lease Obligations ("MLOs")-MLOs are issued by state and local
governments and authorities to acquire land and a wide variety of equipment and
facilities. These obligations typically are not fully backed by the
municipality's credit and thus interest may become taxable if the lease is
assigned. If funds are not appropriated for the following year's lease payments,
a lease may terminate with the possibility of default on the lease obligation.
With respect to MLOs purchased by the corresponding Portfolio of the Municipal
Money Market Fund, the AMR Trust Board has established the following guidelines
for determining the liquidity of the MLOs in its portfolio, and, subject to
review by the AMR Trust Board, has delegated that responsibility to the
investment adviser: (1) the frequency of trades and quotes for the security; (2)
the number of dealers willing to purchase or sell the security and the number of
other potential buyers; (3) the willingness of dealers to undertake to make a
market in the security; (4) the nature of the marketplace trades; (5) the
likelihood that the marketability of the obligation will be maintained through
the time the security is held by the Portfolio; (6) the credit quality of the
issuer and the lessee; (7) the essentiality to the lessee of the property
covered by the lease and (8) for unrated MLOs, the MLOs' credit status analyzed
according to the factors reviewed by rating agencies.

         Private Activity Obligations-Private activity obligations are issued to
finance, among other things, privately operated housing facilities, pollution
control facilities, convention or trade show facilities, mass transit, airport,
port or parking facilities and certain facilities for water supply, gas,
electricity, sewage or solid waste disposal. Private activity obligations are
also issued to privately held or publicly owned corporations in the financing of
commercial or industrial facilities. The principal and interest on these
obligations may be payable from the general revenues of the users of such
facilities. Shareholders, depending on their individual tax status, may be
subject to the federal alternative minimum tax on the portion of a distribution
attributable to these obligations. Interest on private activity obligations will
be considered exempt from federal income taxes; however, shareholders should
consult their own tax advisers to determine whether they may be subject to the
federal alternative minimum tax.

         Ratings of Long-Term Obligations-The Portfolio utilizes ratings
provided by the following nationally recognized statistical rating organizations
("Rating Organizations") in order to determine eligibility of long-term
obligations.

         The four highest Moody's Investors Service, Inc. ("Moody's") ratings
for long-term obligations (or issuers thereof) are Aaa, Aa, A and Baa.
Obligations rated Aaa are judged by Moody's to be of the best quality.
Obligations rated Aa are judged to be of high quality by all standards. Together
with the Aaa group, such debt


                                       33
<PAGE>   181


comprises what is generally known as high-grade debt. Moody's states that debt
rated Aa is rated lower than Aaa debt because margins of protection or other
elements make long-term risks appear somewhat larger than for Aaa debt.
Obligations which are rated A by Moody's possess many favorable investment
attributes and are considered "upper medium-grade obligations." Obligations
which are rated Baa by Moody's are considered to be medium grade obligations,
i.e., they are neither highly protected nor poorly secured. Interest payments
and principal security appear adequate for the present but certain protective
elements may be lacking or may be characteristically unreliable over any great
length of time. Moody's also supplies numerical indicators 1, 2, and 3 to rating
categories. The modifier 1 indicates that the security is in the higher end of
its rating category; the modifier 2 indicates a mid-range ranking; and modifier
3 indicates a ranking toward the lower end of the category.

         The four highest Standard & Poor's ratings for long-term obligations
are AAA, AA, A and BBB. Obligations rated AAA have the highest rating assigned
by Standard & Poor's. Capacity to pay interest and repay principal is extremely
strong. Obligations rated AA have a very strong capacity to pay interest and
repay principal and differ from the highest rated issues only in a small degree.
Obligations rated A have a strong capacity to pay principal and interest,
although they are somewhat more susceptible to the adverse effects of changes in
circumstances and economic conditions. Obligations rated BBB by Standard &
Poor's are regarded as having adequate capacity to pay interest and repay
principal. Whereas it normally exhibits adequate protection parameters, adverse
economic conditions or changing circumstances are more likely to lead to a
weakened capacity to pay interest and repay principal for debt in this category
than in higher rated categories.

         Duff & Phelps' four highest ratings for long-term obligations are AAA,
AA, A and BBB. Obligations rated AAA have the highest credit quality with risk
factors being negligible. Obligations rated AA are of high credit quality and
strong protection factors. Risk is modest but may vary slightly from time to
time because of economic conditions. Obligations rated A have average but
adequate protection factors. However, risk factors are more variable and greater
in periods of economic stress. Obligations rated BBB have below average
protection factors with considerable variability in risk during economic cycles,
but are still considered sufficient for prudent investment.

         Thomson BankWatch ("BankWatch") long-term debt ratings apply to
specific issues of long-term debt and preferred stock. They specifically assess
the likelihood of an untimely repayment of principal or interest over the term
to maturity of the rated instrument. BankWatch's four highest ratings for
long-term obligations are AAA, AA, A and BBB. Obligations rated AAA indicate
that the ability to repay principal and interest on a timely basis is very high.
Obligations rated AA indicate a superior ability to repay principal and interest
on a timely basis, with limited incremental risk compared to issues rated in the
highest category. Obligations rated A indicate the ability to repay principal
and interest is strong. Issues rated A could be more vulnerable to adverse
developments (both internal and external) than obligations with higher ratings.
BBB is the lowest investment grade category and indicates an acceptable capacity
to repay principal and interest. Issues rated BBB are, however, more vulnerable
to adverse developments (both internal and external) than obligations with
higher ratings.

         Fitch IBCA, Inc. ("Fitch") investment grade bond ratings provide a
guide to investors in determining the credit risk associated with a particular
security. The ratings represent Fitch's assessment of the issuer's ability to
meet the obligations of a specific debt issue or class of debt in a timely
manner. Obligations rated AAA are considered to be investment grade and of the
highest credit quality. The obligor has an exceptionally strong ability to pay
interest and repay principal, which is unlikely to be affected by reasonable
foreseeable events. Bonds rated AA are considered to be investment grade and of
very high credit quality. The obligor's ability to pay interest and repay
principal is very strong, although not quite as strong as bonds rated AAA. Bonds
rated A are considered to be investment grade and of high credit quality. The
obligor's ability to pay interest and repay principal is considered to be
strong, but may be more vulnerable to adverse changes in economic conditions and
circumstances than bonds with higher ratings. Bonds rated BBB are considered to
be investment grade and of satisfactory credit quality. The obligor's ability to
pay interest and repay principal is considered to be adequate. Adverse changes
in economic conditions and circumstances, however, are more likely to have
adverse impact on these bonds, and therefore impair timely payment. The
likelihood that the ratings of these bonds will fall below investment grade is
higher than for bonds with higher ratings.

         Standard & Poor's, Duff & Phelps and Fitch apply indicators, such as
"+","-," or no character, to indicate relative standing within the major rating
categories.

         Ratings of Municipal Obligations-Moody's ratings for state and
municipal short-term obligations are designated Moody's Investment Grade or
"MIG" with variable rate demand obligations being designated as


                                       34
<PAGE>   182


"VMIG." A VMIG rating may also be assigned to commercial paper programs that are
characterized as having variable short-term maturities but having neither a
variable rate nor demand feature. Factors used in determination of ratings
include liquidity of the borrower and short-term cyclical elements.

         Standard & Poor's uses SP-1, SP-2, and SP-3 to rate short-term
municipal obligations. A rating of SP-1 denotes a very strong or strong capacity
to pay principal and interest.

         Ratings of Short-Term Obligations-The rating P-1 is the highest
short-term rating assigned by Moody's. Among the factors considered by Moody's
in assigning ratings are the following: (1) evaluations of the management of the
issuer; (2) economic evaluation of the issuer's industry or industries and an
appraisal of speculative-type risks which may be inherent in certain areas; (3)
evaluation of the issuer's products in relation to competition and customer
acceptance; (4) liquidity; (5) amount and quality of long-term debt; (6) trend
of earnings over a period of ten years; (7) financial strength of a parent
company and the relationships which exist with the issuer; and (8) recognition
by the management of obligations which may be present or may arise as a result
of public interest questions and preparations to meet such obligations.

         Short-term obligations (or issuers thereof) rated A-1 by Standard &
Poor's have the following characteristics. Liquidity ratios are adequate to meet
cash requirements. The issuer has access to at least two additional channels of
borrowing. Basic earnings and cash flow have an upward trend with allowance made
for unusual circumstances. Typically, the issuer's industry is well established
and the issuer has a strong position within the industry. The reliability and
quality of management are unquestioned. Relative strength or weakness of the
above factors determines whether the issuer's short-term obligation is rated
A-1, A-2, or A-3.

         The distinguishing feature of Duff & Phelps Credit Ratings' short-term
rating is the refinement of the traditional 1 category. The majority of
short-term debt issuers carry the highest rating, yet quality differences exist
within that tier. Obligations rated D-1+ indicate the highest certainty of
timely payment. Safety is just below risk-free U.S. Treasury obligations.
Obligations rated D-1 have a very high certainty of timely payment. Risk factors
are minor. Obligations rated D-1- have a high certainty of timely payment. Risk
factors are very small. Obligations rated D-2 have good certainty of timely
payment. Liquidity factors and company fundamentals are sound. Although ongoing
funding needs may enlarge total financing requirements, access to capital
markets is good. Risk factors are small.

         Thomson BankWatch short-term ratings are intended to assess the
likelihood of an untimely or incomplete payment of principal or interest.
Obligations rated TBW-1 indicate a very high likelihood that principal and
interest will be paid on a timely basis. While the degree of safety regarding
timely payment of principal and interest is strong for an obligation rated
TBW-2, the relative degree of safety is not as high as for issues rated TBW-1.

         Fitch's short-term ratings apply to debt obligations that are payable
on demand or have original maturities of generally up to three years, including
commercial paper, certificates of deposit, medium-term notes, and municipal and
investment notes. A rating of F-1+ indicates exceptionally strong credit
quality. Issues assigned this rating are regarded as having the strongest degree
of assurance for timely payment. Obligations rated F-1 have very strong credit
quality. Issues assigned this rating reflect an assurance of timely payment only
slightly less in degree than issues rated F-1+. Issues assigned a rating of F-2
indicate good credit quality. Issues assigned this rating have a satisfactory
degree of assurance for timely payment, but the margin of safety is not as great
as for issues assigned F-1+ and F-1 ratings.

         Repurchase Agreements-A repurchase agreement, which provides a means to
earn income on funds for periods as short as overnight, is an arrangement under
which the purchaser (e.g., a Portfolio) purchases securities and the seller
agrees, at the time of sale, to repurchase the securities at a specified time
and price. The repurchase price will be higher than the purchase price, the
difference being income to the purchaser, or the purchase and repurchase prices
may be the same, with interest at a stated rate due to the purchaser together
with the repurchase price on repurchase. In either case, the income to the
purchaser is unrelated to the interest rate on the securities subject to the
repurchase agreement.

         Each Portfolio may enter into repurchase agreements with any bank or
registered broker-dealer who, in the opinion of the Manager or the Equity 500
Index Portfolio Board, as appropriate, presents a minimum risk of bankruptcy
during the term of the agreement based upon guidelines that periodically are
reviewed by the AMR Trust Board and the Equity 500 Index Portfolio Board. Each
Portfolio may enter into repurchase agreements as a short-term investment of its
idle cash in order to earn income. The securities will be held by a custodian
(or


                                       35
<PAGE>   183


agent) approved by the AMR Trust Board or the Equity 500 Index Portfolio Board,
as appropriate, during the term of the agreement. However, if the market value
of the securities subject to the repurchase agreement becomes less than the
repurchase price (including interest), the Portfolio will direct the seller of
the securities to deliver additional securities so that the market value of all
securities subject to the repurchase agreement will equal or exceed the
repurchase price.

         In the event of the commencement of bankruptcy or insolvency
proceedings with respect to the seller of the securities before the repurchase
of the securities under a repurchase agreement, a Portfolio may encounter a
delay and incur costs before being able to sell the security being held as
collateral. Delays may involve loss of interest or decline in price of the
securities. Apart from the risk of bankruptcy or insolvency proceedings, there
is also the risk that the seller may fail to repurchase the securities, in which
case a Portfolio may incur a loss if the proceeds to the Portfolio from the sale
of the securities to a third party are less than the repurchase price.

         Reverse Repurchase Agreements-The Portfolios may borrow funds for
temporary purposes by entering into reverse repurchase agreements. Pursuant to
such agreements, a Portfolio would sell portfolio securities to financial
institutions such as banks and broker/dealers and agree to repurchase them at a
mutually agreed-upon date and price. The Portfolios intend to enter into reverse
repurchase agreements only to avoid selling securities to meet redemptions
during market conditions deemed unfavorable by the investment adviser possessing
investment authority. At the time a Portfolio enters into a reverse repurchase
agreement, it will place in a segregated custodial account assets such as liquid
high quality debt securities having a value not less than 100% of the repurchase
price (including accrued interest), and will subsequently monitor the account to
ensure that such required value is maintained. Reverse repurchase agreements
involve the risk that the market value of the securities sold by a Portfolio may
decline below the price at which such Portfolio is obligated to repurchase the
securities. Reverse repurchase agreements are considered to be borrowings by an
investment company under the 1940 Act.

         Resource Recovery Obligations-Resource recovery obligations are a type
of municipal revenue obligation issued to build facilities such as solid waste
incinerators or waste-to-energy plants. Usually, a private corporation will be
involved and the revenue cash flow will be supported by fees or units paid by
municipalities for use of the facilities. The viability of a resource recovery
project, environmental protection regulations and project operator tax
incentives may affect the value and credit quality of these obligations.

         Revenue Obligations-Revenue obligations are backed by the revenue cash
flow of a project or facility.

         Rights and Warrants-Rights are short-term warrants issued in
conjunction with new stock issues. Warrants are options to purchase an issuer's
securities at a stated price during a stated term. There is no specific limit on
the percentage of assets a Portfolio may invest in rights and warrants, although
the ability of some of the Portfolios to so invest is limited by their
investment objectives or policies.

         Section 4(2) Securities-Section 4(2) securities are restricted as to
disposition under the federal securities laws, and generally are sold to
institutional investors, such as the Portfolio, that agree they are purchasing
the securities for investment and not with an intention to distribute to the
public. Any resale by the purchaser must be pursuant to an exempt transaction
and may be accomplished in accordance with Rule 144A. Section 4(2) securities
normally are resold to other institutional investors through or with the
assistance of the issuer or dealers that make a market in the Section 4(2)
securities, thus providing liquidity.

         The AMR Trust Board, the Equity 500 Index Portfolio Board and the
applicable investment adviser will carefully monitor the Portfolio's investments
in Section 4(2) securities offered and sold under Rule 144A, focusing on such
important factors, among others, as valuation, liquidity, and availability of
information. Investments in Section 4(2) securities could have the effect of
reducing the Portfolio's liquidity to the extent that qualified institutional
buyers no longer wish to purchase these restricted securities.

         Separately Traded Registered Interest and Principal Securities and Zero
Coupon Obligations-Separately traded registered interest and principal
securities or "STRIPS" and zero coupon obligations are securities that do not
make regular interest payments. Instead they are sold at a discount from their
face value. Each Portfolio will take into account as income a portion of the
difference between these obligations' purchase prices and their face values.
Because they do not pay coupon income, the prices of STRIPS and zero coupon
obligations can be very volatile when interest rates change. STRIPS are zero
coupon bonds issued by the U.S. Treasury.


                                       36
<PAGE>   184


         Tax, Revenue or Bond Anticipation Notes-Tax, revenue or bond
anticipation notes are issued by municipalities in expectation of future tax or
other revenues which are payable from these specific taxes or revenues. Bond
anticipation notes usually provide interim financing in advance of an issue of
bonds or notes, the proceeds of which are used to repay the anticipation notes.
Tax-exempt commercial paper is issued by municipalities to help finance
short-term capital or operating needs in anticipation of future tax or other
revenue.

         U.S. Government Securities-U.S. Government securities are issued or
guaranteed by the U.S. Government and include U.S. Treasury obligations (see
definition below) and securities issued by U.S. agencies and instrumentalities.

         U.S. Government agencies or instrumentalities that issue or guarantee
securities include, but are not limited to, the Federal Housing Administration,
Farmers Home Administration, Export-Import Bank of the United States, Small
Business Administration, GNMA, General Services Administration, Central Bank for
Cooperatives, Federal Home Loan Banks, FHLMC, Federal Intermediate Credit Banks,
Federal Land Banks, Maritime Administration, Tennessee Valley Authority,
District of Columbia Armory Board, Inter-American Development Bank,
Asian-American Development Bank, Agency for International Development, Student
Loan Marketing Association and International Bank of Reconstruction and
Development.

         Obligations of U.S. Government agencies and instrumentalities may or
may not be supported by the full faith and credit of the United States. Some are
backed by the right of the issuer to borrow from the Treasury; others are
supported by discretionary authority of the U.S. Government to purchase the
agencies' obligations; while still others, such as the Student Loan Marketing
Association, are supported only by the credit of the instrumentality. In the
case of securities not backed by the full faith and credit of the United States,
the investor must look principally to the agency issuing or guaranteeing the
obligation for ultimate repayment, and may not be able to assert a claim against
the United States itself in the event the agency or instrumentality does not
meet its commitment.

         U.S. Treasury Obligations-U.S. Treasury obligations include bills,
notes and bonds issued by the U.S. Treasury and Separately Traded Registered
Interest and Principal component parts of such obligations known as STRIPS.

         Variable or Floating Rate Obligations-A variable rate obligation is one
whose terms provide for the adjustment of its interest rate on set dates and
which, upon such adjustment, can reasonably be expected to have a market value
that approximates its par value. A floating rate obligation is one whose terms
provide for the adjustment of its interest rate whenever a specified interest
rate changes and which, at any time, can reasonably be expected to have a market
value that approximates its par value. Variable or floating rate obligations may
be secured by bank letters of credit.

         Pursuant to Rule 2a-7 under the 1940 Act, variable or floating rate
obligations with stated maturities of more than 397 days may be deemed to have
shorter maturities as follows:

         (1) An obligation that is issued or guaranteed by the United States
Government or any agency thereof which has a variable rate of interest
readjusted no less frequently than every 762 days will be deemed by a Portfolio
to have a maturity equal to the period remaining until the next readjustment of
the interest rate.

         (2) A variable rate obligation, the principal amount of which is
scheduled on the face of the instrument to be paid in 397 days or less, will be
deemed by a Portfolio to have a maturity equal to the period remaining until the
next readjustment of the interest rate.

         (3) A variable rate obligation that is subject to a demand feature will
be deemed by a Portfolio to have a maturity equal to the longer of the period
remaining until the next readjustment of the interest rate or the period
remaining until the principal amount can be recovered through demand.

         (4) A floating rate obligation that is subject to a demand feature will
be deemed by a Portfolio to have a maturity equal to the period remaining until
the principal amount can be recovered through demand.

         As used above, an obligation is "subject to a demand feature" when a
Portfolio is entitled to receive the principal amount of the obligation either
at any time on no more than 30 days' notice or at specified intervals not
exceeding one year and upon no more than 30 days' notice.


                                       37
<PAGE>   185


         Variable Rate Auction and Residual Interest Obligations-Variable rate
auction and residual interest obligations are created when an issuer or dealer
separates the principal portion of a long-term, fixed-rate municipal bond into
two long-term, variable-rate instruments. The interest rate on one portion
reflects short-term interest rates, while the interest rate on the other portion
is typically higher than the rate available on the original fixed-rate bond.

         When-Issued and Forward Commitment Transactions- For purchases on a
when-issued basis, the price of the security is fixed at the date of purchase,
but delivery of and payment for the securities is not set until after the
securities are issued (generally one to two months later). The value of
when-issued securities is subject to market fluctuation during the interim
period and no income accrues to a Portfolio until settlement takes place.
Forward commitment transactions involve a commitment to purchase or sell
securities with payment and delivery to take place at some future date, normally
one to two months after the date of the transaction. The payment obligation and
interest rate are fixed at the time the buyer enters into the forward
commitment. Forward commitment transactions are typically used as a hedge
against anticipated changes in interest rates and prices. Each Portfolio
maintains with the Custodian a segregated account containing high-grade liquid
securities in an amount at least equal to the when-issued or forward commitment
transaction. Forward commitment transactions are executed for existing
obligations, whereas in a when-issued transaction, the obligations have not yet
been issued. When entering into a when-issued or forward commitment transaction,
a Portfolio will rely on the other party to consummate the transaction; if the
other party fails to do so, the Portfolio may be disadvantaged.


                                       38
<PAGE>   186


                              FINANCIAL STATEMENTS

         The American AAdvantage Funds' Annual Report to Shareholders for the
period ended October 31, 1999, the American AAdvantage Money Market Funds'
Annual Report to Shareholders for the period ended December 31, 1999 and the S&P
500 Index Fund's Annual Report to Shareholders for the period ended December 31,
1999 are supplied with the Statement of Additional Information, and the
financial statements and accompanying notes appearing therein are incorporated
by reference in this Statement of Additional Information.


                                       39
<PAGE>   187


                                   APPENDIX A

         The following table shows the performance of the S&P 500 Composite
Stock Price Index for the periods indicated. Stock prices fluctuated widely
during the periods but were higher at the end than at the beginning. The results
shown should not be considered as a representation of the income or capital gain
or loss that may be generated by the Index in the future or should this be
considered a representation of the past or future performance of the S&P 500
Index Fund.

<TABLE>
<CAPTION>
     YEAR           TOTAL RETURN                YEAR      TOTAL RETURN                 YEAR       TOTAL RETURN
     ----           ------------                ----      ------------                 ----       ------------
<S>                 <C>                         <C>       <C>                          <C>        <C>
     1999              20.99%                   1974          (26.47)%                 1949            18.79%
     1998              28.76%                   1973          (14.66)%                 1948            5.50%
     1997              33.26%                   1972           18.98%                  1947            5.71%
     1996              23.03%                   1971           14.31%                  1946           (8.07)%
     1995              37.49%                   1970           4.01%                   1945            36.44%
     1994              1.32%                    1969          (8.51)%                  1944            19.75%
     1993              9.99%                    1968           11.06%                  1943            25.90%
     1992              7.67%                    1967           23.98%                  1942            20.34%
     1991              30.55%                   1966          (10.06)%                 1941           (11.59)%
     1990             (3.17)%                   1965           12.45%                  1940           (9.78)%
     1989              31.49%                   1964           16.48%                  1939           (0.41)%
     1988              16.81%                   1963           22.08%                  1938           31.12)%
     1987              5.23%                    1962          (8.73)%                  1937           (35.03)%
     1986              18.47%                   1961           26.89%                  1936            33.92%
     1985              32.16%                   1960           0.47%                   1935            47.67%
     1984              6.27%                    1959           11.96%                  1934           (1.44)%
     1983              22.51%                   1958           43.36%                  1933            53.99%
     1982              21.41%                   1957          (10.78)%                 1932           (8.19)%
     1981             (4.91)%                   1956           6.56%                   1931           (43.34)%
     1980              32.42%                   1955           31.56%                  1930           (24.90)%
     1979              18.44%                   1954           52.62%                  1929            (8.42%
     1978              6.56%                    1953          (0.99)%                  1928            43.61%
     1977             (7.18)%                   1952           18.73%                  1927            37.49%
     1976              23.84%                   1951           24.02%                  1926            11.62%
     1975              37.20%                   1950           31.71%
</TABLE>




                                       40

<PAGE>   188



                       STATEMENT OF ADDITIONAL INFORMATION

                          AMERICAN AADVANTAGE FUNDS(R)
                      AMERICAN AADVANTAGE MILEAGE FUNDS(R)

                            -- PLATINUM CLASS(SM) --

                                  MARCH 1, 2000

     The American AAdvantage Money Market Fund(sm) (the "Money Market Fund"),
the American AAdvantage Municipal Money Market Fund(sm) (the "Municipal Money
Market Fund"), and the American AAdvantage U.S. Government Money Market
Fund(sm), formerly known as the American AAdvantage U.S. Treasury Money Market
Fund prior to March 1, 1997 (the "U.S. Government Money Market Fund"), are three
separate investment portfolios of the American AAdvantage Funds (the "AAdvantage
Trust"). The American AAdvantage Money Market Mileage Fund(sm) (the "Money
Market Mileage Fund"), the American AAdvantage Municipal Money Market Mileage
Fund(sm) (the "Municipal Money Market Mileage Fund"), and the American
AAdvantage U.S. Government Money Market Mileage Fund(sm) (the "U.S. Government
Money Market Mileage Fund") (collectively, the "Mileage Funds") are three
separate investment portfolios of the American AAdvantage Mileage Funds (the
"Mileage Trust") (individually, a "Fund" and, collectively, the "Funds"). The
AAdvantage Trust and the Mileage Trust (collectively the "Trusts") are no load,
open-end, diversified management investment companies. The Trusts were organized
as Massachusetts business trusts on January 16, 1987 and February 22, 1995,
respectively. Each Fund consists of multiple classes of shares designed to meet
the needs of different groups of investors. This Statement of Additional
Information ("SAI") relates only to the Platinum Class of the Funds.

     Each Fund seeks its investment objective by investing all of its investable
assets in a corresponding portfolio (individually, a "Portfolio" and,
collectively, the "Portfolios") of the AMR Investment Services Trust ("AMR
Trust") that has a similar name and an identical investment objective to the
investing Fund.

     This SAI should be read in conjunction with the Platinum Class prospectus
dated March 1, 2000 ("Prospectus"), a copy of which may be obtained without
charge by calling (800) 967-9009.

     This SAI is not a prospectus and is authorized for distribution to
prospective investors only if preceded or accompanied by a current Prospectus.

<PAGE>   189
                                TABLE OF CONTENTS

<TABLE>
<S>                                                                                                                     <C>
Non-Principal Investment Strategies and Risks............................................................................2

Investment Restrictions..................................................................................................2

Trustees and Officers of the Trusts and the AMR Trust....................................................................4

Control Persons and 5% Shareholders......................................................................................6

Management, Administrative Services and Distribution Fees................................................................7

Other Service Providers..................................................................................................8

Redemptions in Kind......................................................................................................8

Net Asset Value..........................................................................................................8

Tax Information..........................................................................................................8

Yield and Total Return Quotations.......................................................................................10

Description of the Trusts...............................................................................................12

Other Information.......................................................................................................12

Financial Statements....................................................................................................20
</TABLE>



<PAGE>   190


                  NON-PRINCIPAL INVESTMENT STRATEGIES AND RISKS

Each Fund may:

     1. Invest in other investment companies (including affiliated investment
     companies) to the extent permitted by the Investment Company Act of 1940
     ("1940 Act") or exemptive relief granted by the Securities and Exchange
     Commission ("SEC").

     2. Loan securities to broker-dealers or other institutional investors.
     Securities loans will not be made if, as a result, the aggregate amount of
     all outstanding securities loans by a Portfolio exceeds 33 1/3% of its
     total assets (including the market value of collateral received). For
     purposes of complying with a Portfolio's investment policies and
     restrictions, collateral received in connection with securities loans is
     deemed an asset of the Portfolio to the extent required by law. AMR
     Investment Services, Inc. (the "Manager") receives compensation for
     administrative and oversight functions with respect to securities lending.
     The amount of such compensation depends on the income generated by the loan
     of the securities. A Portfolio continues to receive interest on the
     securities loaned and simultaneously earns either interest on the
     investment of the cash collateral or fee income if the loan is otherwise
     collateralized.

     3. Enter into repurchase agreements. A repurchase agreement is an agreement
     under which securities are acquired by a Portfolio from a securities dealer
     or bank subject to resale at an agreed upon price on a later date. The
     acquiring Portfolio bears a risk of loss in the event that the other party
     to a repurchase agreement defaults on its obligations and the Portfolio is
     delayed or prevented from exercising its rights to dispose of the
     collateral securities. However, the Manager attempts to minimize this risk
     by entering into repurchase agreements only with financial institutions
     that are deemed to be of good financial standing.

     4. Purchase securities in private placement offerings made in reliance on
     the "private placement" exemption from registration afforded by Section
     4(2) of the Securities Act of 1933 ("1933 Act"), and resold to qualified
     institutional buyers under Rule 144A under the 1933 Act ("Section 4(2)
     securities"). The Portfolios will not invest more than 10% of their
     respective net assets in Section 4(2) securities and illiquid securities
     unless the applicable investment adviser determines, by continuous
     reference to the appropriate trading markets and pursuant to guidelines
     approved by the AMR Trust Board of Trustees ("AMR Trust Board"), that any
     Section 4(2) securities held by such Portfolio in excess of this level are
     at all times liquid.

                             INVESTMENT RESTRICTIONS

     Each Fund has the following fundamental investment policy that enables it
to invest in a corresponding Portfolio of the AMR Trust:

          Notwithstanding any other limitation, the Fund may invest all of its
          investable assets in an open-end management investment company with
          substantially the same investment objectives, policies and limitations
          as the Fund. For this purpose, "all of the Fund's investable assets"
          means that the only investment securities that will be held by the
          Fund will be the Fund's interest in the investment company.

     All other fundamental investment policies and the non-fundamental policies
of each Fund and its corresponding Portfolio are identical. Therefore, although
the following discusses the investment policies of each Portfolio and the AMR
Trust Board, it applies equally to each Fund and the AAdvantage Trust's Board of
Trustees ("AAdvantage Board") and the Mileage Trust's Board of Trustees
("Mileage Trust Board"), as applicable.

     In addition to the investment limitations noted in the Prospectus, the
following restrictions have been adopted by each Portfolio and may be changed
with respect to any Portfolio only by the majority vote of that Portfolio's
outstanding interests. "Majority of the outstanding voting securities" under the
Investment Company Act of 1940, as amended (the "1940 Act"), and as used herein
means, with respect to the Portfolio, the lesser of (a) 67% of the interests of
the Portfolio present at the meeting if the holders of more than 50% of the
interests are present and represented at the interest holders' meeting or (b)
more than 50% of the interests of the Portfolio. Whenever a Fund is requested to
vote on a change in the investment restrictions of its corresponding Portfolio,
that Fund will hold a meeting of its shareholders and will cast its votes as
instructed by its shareholders. The percentage of a Fund's votes representing
that Fund's shareholders not voting will be voted by the AAdvantage Board and
the Mileage Trust Board in the same proportion as those Fund shareholders who
do, in fact, vote.

                                       2

<PAGE>   191


No Portfolio may:

     1. Purchase or sell real estate or real estate limited partnership
     interests, provided, however, that the Portfolio may invest in securities
     secured by real estate or interests therein or issued by companies which
     invest in real estate or interests therein when consistent with the other
     policies and limitations described in the Prospectus.

     2. Purchase or sell commodities (including direct interests and/or leases
     in oil, gas or minerals) or commodities contracts, except with respect to
     forward foreign currency exchange contracts, foreign currency futures
     contracts and when-issued securities when consistent with the other
     policies and limitations described in the Prospectus.

     3. Engage in the business of underwriting securities issued by others
     except to the extent that, in connection with the disposition of
     securities, the Portfolio may be deemed an underwriter under federal
     securities law.

     4. Make loans to any person or firm, provided, however, that the making of
     a loan shall not be construed to include (i) the acquisition for investment
     of bonds, debentures, notes or other evidences of indebtedness of any
     corporation or government which are publicly distributed or (ii) the entry
     into repurchase agreements and further provided, however, that each
     Portfolio may lend its investment securities to broker-dealers or other
     institutional investors in accordance with the guidelines stated in the
     Prospectus.

     5. Purchase from or sell portfolio securities to its officers, Trustees or
     other "interested persons" of the AMR Trust, as defined in the 1940 Act,
     including its investment advisers and their affiliates, except as permitted
     by the 1940 Act and exemptive rules or orders thereunder.

     6. Issue senior securities except that the Portfolio may engage in
     when-issued and forward commitment transactions.

     7. Borrow money, except from banks or through reverse repurchase agreements
     for temporary purposes in an aggregate amount not to exceed 10% of the
     value of its total assets at the time of borrowing. In addition, although
     not a fundamental policy, the Portfolios intend to repay any money borrowed
     before any additional portfolio securities are purchased. See "Other
     Information" for a further description regarding reverse repurchase
     agreements.

     8. Invest more than 5% of its total assets (taken at market value) in
     securities of any one issuer, other than obligations issued by the U.S.
     Government, its agencies and instrumentalities, or purchase more than 10%
     of the voting securities of any one issuer, with respect to 75% of the
     Portfolio's total assets; or

     9. Invest more than 25% of its total assets in the securities of companies
     primarily engaged in any one industry (except for the banking industry),
     provided that: (i) this limitation does not apply to obligations issued or
     guaranteed by the U.S. Government, its agencies and instrumentalities; (ii)
     municipalities and their agencies and authorities are not deemed to be
     industries; and (iii) financial service companies are classified according
     to the end users of their services (for example, automobile finance, bank
     finance, and diversified finance will be considered separate industries).

     The following non-fundamental investment restrictions may be changed with
respect to each Fund by a vote of a majority of the Board or, with respect to
the Portfolio, by a vote of a majority of the AMR Trust Board. The Portfolio may
not:

     1. Invest more than 15% of its net assets in illiquid securities, including
     time deposits and repurchase agreements that mature in more than seven
     days; or

     2. Purchase securities on margin, effect short sales (except that a
     Portfolio may obtain such short term credits as may be necessary for the
     clearance of purchases or sales of securities) or purchase or sell call
     options or engage in the writing of such options.

     All Portfolios may invest up to 10% of their total assets in the securities
of other investment companies to the extent permitted by law. A Portfolio may
incur duplicate advisory or management fees when investing in another mutual
fund.

                                       3

<PAGE>   192


              TRUSTEES AND OFFICERS OF THE TRUSTS AND THE AMR TRUST

     The AAdvantage Board, the Mileage Trust Board and the AMR Trust Board
provide broad supervision over each Trust's affairs. The Manager is responsible
for the management and the administration of each Trust's assets, and each
Trust's officers are responsible for the respective Trust's operations. The
Trustees and officers of the Trusts and the AMR Trust are listed below, together
with their principal occupations during the past five years. Unless otherwise
indicated, the address of each person listed below is 4333 Amon Carter
Boulevard, MD 5645, Fort Worth, Texas 76155.

<TABLE>
<CAPTION>
                                       POSITION WITH
NAME, AGE AND ADDRESS                   EACH TRUST        PRINCIPAL OCCUPATION DURING PAST 5 YEARS
- ---------------------                  -------------      ----------------------------------------

<S>                                    <C>                <C>
William F. Quinn* (52)                 Trustee and        President, AMR Investment Services, Inc. (1986-Present); Chairman,
                                       President          American Airlines Employees Federal Credit Union (October 1989-Present);
                                                          Director, Crescent Real Estate Equities, Inc. (1994-Present); Vice
                                                          Chairman, United Way of Tarrant County, Texas (1988-Present); Director,
                                                          Southern Methodist University Cox School of Business (1999-Present);
                                                          Director, Southern Methodist University Endowment Fund Advisory Board
                                                          (1996-Present); Trustee, American AAdvantage Funds (1987-Present);
                                                          Trustee, American AAdvantage Mileage Funds (1995-Present); Trustee,
                                                          American Select Funds (1999-Present).

Alan D. Feld (63)                      Trustee            Partner, Akin, Gump, Strauss, Hauer & Feld, LLP (1960-Present)#;
1700 Pacific Avenue                                       Director, Clear Channel Communications (1984-Present); Director,
Suite 4100                                                CenterPoint Properties, Inc. (1994-Present); Trustee, American
Dallas, Texas  75201                                      AAdvantage Funds (1996-Present); Trustee, American AAdvantage
                                                          Mileage Funds (1996-Present); Trustee, American Select Funds
                                                          (1999-Present).

Ben J. Fortson (67)                    Trustee            President and CEO, Fortson Oil Company (1958-Present); Director,
301 Commerce Street                                       Kimbell Art Foundation (1964-Present); Director, Burnett
Suite 3301                                                Foundation (1987-Present); Honorary Trustee, Texas Christian
Fort Worth, Texas  76102                                  University (1986-Present); Trustee, American AAdvantage Funds
                                                          (1996-Present); Trustee, American AAdvantage Mileage Funds (1996-Present);
                                                          Trustee, American Select Funds (1999-Present).

John S. Justin (83)                    Trustee            Chairman (1969-Present), Chief Executive Officer (1969-1999),
2821 West Seventh Street                                  Justin Industries, Inc. (a diversified holding company); Executive
Fort Worth, Texas  76107                                  Board Member, Blue Cross/Blue Shield of Texas (1985-Present);
                                                          Board Member, Zale Lipshy Hospital (June 1993-Present); Trustee, Texas
                                                          Christian University (1980-Present); Director and Executive Board Member,
                                                          Moncrief Radiation Center (1985-Present); Trustee, American AAdvantage
                                                          Funds (1989-Present); Trustee, American AAdvantage Mileage Funds
                                                          (1995-Present); Trustee, American Select Funds (1999-Present).

Stephen D. O'Sullivan* (64)            Trustee            Consultant (1994-Present); Trustee, American AAdvantage Funds
                                                          (1987-Present); Trustee, American AAdvantage Mileage Funds (1995-Present);
                                                          Trustee, American Select Funds (1999-Present).
</TABLE>

                                        4

<PAGE>   193


<TABLE>
<CAPTION>
                                       POSITION WITH
NAME, AGE AND ADDRESS                   EACH TRUST        PRINCIPAL OCCUPATION DURING PAST 5 YEARS
- ---------------------                  -------------      ----------------------------------------

<S>                                    <C>                <C>
Roger T. Staubach (58)                 Trustee            Chairman of the Board and Chief Executive Officer of The Staubach
15601 Dallas Parkway                                      Company (a commercial real estate company) (1982-Present);
Suite 400                                                 Director, Brinker International (1993-Present); Trustee, Institute
Dallas, Texas 75001                                       for Aerobics Research; Member, Executive Council, Daytop/Dallas; Member,
                                                          National Board of Governors, United Way of America; Board of Directors,
                                                          PowerUP; former quarterback of the Dallas Cowboys professional football
                                                          team; Trustee, American AAdvantage Funds (1995-Present); Trustee, American
                                                          AAdvantage Mileage Funds (1995-Present); Trustee, American Select Funds
                                                          (1999-Present).

Kneeland Youngblood (44)               Trustee            Managing Partner, Pharos Capital Group, LLC (a private equity firm)
100 Crescent Court                                        (1998-Present); Director, L&B Realty Advisors (1998-2000); Trustee,
Suite 1740                                                Teachers Retirement System of Texas (1993-1999); Director, United
Dallas, Texas 75201                                       States Enrichment Corporation (1993-1998), Director, Just For the
                                                          Kids (1995-Present); Director, Starwood Financial Trust (1998-Present);
                                                          Member, Council on Foreign Relations (1995-Present); Trustee, American
                                                          AAdvantage Funds (1996-Present); Trustee, American AAdvantage Mileage
                                                          Funds (1996-Present); Trustee, American Select Funds (1999-Present).

Nancy A. Eckl (37)                     Vice               Vice President, Trust Investments, AMR Investment Services, Inc.
                                       President          (December 1990-Present).

Michael W. Fields (46)                 Vice               Vice President, Fixed Income Investments, AMR Investment Services,
                                       President          Inc. (August 1988-Present).

Barry Y. Greenberg (36)                Vice President     Vice President, Legal and Compliance, AMR Investment Services,
                                       and Assistant      Inc. (1995-Present); Attorney, Securities and Exchange Commission
                                       Secretary          (1988-1995).

Rebecca L. Harris (33)                 Treasurer          Vice President, Finance (1995-Present), Controller (1991-1995),
                                                          AMR Investment Services, Inc.

John B. Roberson (41)                  Vice               Vice President, Sales and Marketing, AMR Investments Services,
                                       President          Inc. (1991-Present).

Robert J. Zutz (47)                    Secretary          Partner, Kirkpatrick & Lockhart LLP (law firm).
1800 Massachusetts Ave. NW
Washington, D.C. 20036
</TABLE>

*  Messrs. Quinn and O'Sullivan are deemed to be "interested persons" of each
   Trust and the AMR Trust as defined by the 1940 Act.

#  The law firm of Akin, Gump, Strauss, Hauer & Feld LLP ("Akin, Gump") provides
   legal services to American Airlines, Inc., an affiliate of the Manager. Mr.
   Feld has advised the Trusts that he has had no material involvement in the
   services provided by Akin, Gump to American Airlines, Inc. and that he has
   received no material benefit in connection with these services. Akin, Gump
   does not provide legal services to the Manager or AMR Corporation.

     All Trustees and officers as a group own less than 1% of the outstanding
shares of any of the Funds.

     As compensation for their service to the Trusts, the American Select Funds
(the "Select Funds") and the AMR Trust, the Independent Trustees and their
spouses receive free air travel from American Airlines, Inc., an affiliate of
the Manager. The Trusts, the Select Funds and the AMR Trust pay American
Airlines the flight service charges incurred for these travel arrangements. The
Trusts, the Select Funds and the AMR Trust compensate each Trustee with payments
in an amount equal to the Trustees' income tax on the value of this free airline
travel. Mr. O'Sullivan, as a retiree of American Airlines, Inc., already
receives flight benefits. Prior to March 1, 2000, the Trusts and the AMR Trust
compensated Mr. O'Sullivan up to $10,000 annually to cover his personal flight
service charges and the charges for his three adult children, as well as any
income tax charged on

                                       5

<PAGE>   194


the value of these flight benefits. Beginning March 1, 2000, Mr. O'Sullivan will
receive an annual retainer of $20,000, plus $1,250 for each Board meeting
attended. Trustees are also reimbursed for any expenses incurred in attending
Board meetings. These amounts (excluding reimbursements) are reflected in the
following table for the fiscal year ended October 31, 1999. The compensation
amounts below include the flight service charges paid by the Trusts and the AMR
Trust to American Airlines.

<TABLE>
<CAPTION>
                                                                                 Pension or        Total
                              Aggregate        Aggregate       Retirement        Estimated      Compensation
                             Compensation     Compensation      Benefits           Annual         From the
                               From the         From the     Accrued as Part      Benefits      Trusts, Select
                              AAdvantage        Mileage      of the Trusts'         Upon          Funds and
Name of Trustee                 Trust            Trust          Expenses         Retirement       AMR Trust
- ---------------                -------          -------          -------          -------          -------

<S>                            <C>              <C>              <C>              <C>              <C>
William F. Quinn               $     0          $     0          $     0          $     0          $     0
Alan D. Feld                   $27,894          $ 1,285          $     0          $     0          $85,697
Ben J. Fortson                 $ 2,532          $   117          $     0          $     0          $ 7,778
John S. Justin                 $     0          $     0          $     0          $     0          $     0
Stephen D. O'Sullivan          $     0          $     0          $     0          $     0          $     0
Roger T. Staubach              $ 9,439          $   435          $     0          $     0          $28,997
Kneeland Youngblood            $21,194          $   977          $     0          $     0          $65,114
</TABLE>

                       CONTROL PERSONS AND 5% SHAREHOLDERS

     There are no persons deemed to control any of the Funds by virtue of their
ownership of more than 25% of the outstanding shares of a Fund as of January 31,
2000.

     The following persons are record owners of 5% or more of the outstanding
shares of the Platinum Class of the Funds as of January 31, 2000:

<TABLE>
<S>                                                                                                                   <C>
American AAdvantage Money Market Fund
National Investor Service Corp.........................................................................................16%
55 Water Street, 32nd Floor
New York, NY  10041-3299

Southwest Securities, Inc..............................................................................................84%
1201 Elm Street, Suite 4300
Dallas, TX  75270-2180

American AAdvantage Municipal Money Market Fund
National Investor Service Corp.........................................................................................13%
55 Water Street, 32nd Floor
New York, NY  10041-3299

Southwest Securities, Inc..............................................................................................87%
1201 Elm Street, Suite 4300
Dallas, TX  75270-2180

American AAdvantage U.S. Government Money Market Fund
National Investor Service Corp.........................................................................................13%
55 Water Street, 32nd Floor
New York, NY  10041-3299

Southwest Securities, Inc..............................................................................................87%
1201 Elm Street, Suite 4300
Dallas, TX  75270-2180

American AAdvantage Money Market Mileage Fund
National Investor Service Corp.........................................................................................91%
55 Water Street, 32nd Floor
New York, NY  10041-3299
</TABLE>

                                       6

<PAGE>   195


<TABLE>
<S>                                                                                                                   <C>
Southwest Securities, Inc...............................................................................................9%
1201 Elm Street, Suite 4300
Dallas, TX  75270-2180

American AAdvantage Municipal Money Market Mileage Fund
AMR Investment Services, Inc..........................................................................................100%
4333 Amon Carter Blvd., MD 5645
Fort Worth, TX  76155

American AAdvantage U.S. Government Money Market Mileage Fund
AMR Investment Services, Inc..........................................................................................100%
4333 Amon Carter Blvd., MD 5645
Fort Worth, TX  76155
</TABLE>

            MANAGEMENT, ADMINISTRATIVE SERVICES AND DISTRIBUTION FEES

     The Manager is paid a management fee as compensation for paying investment
advisory fees and for providing the Trust and the AMR Trust with advisory and
asset allocation services. Pursuant to management and administrative services
agreements, the Manager provides the Trusts and the AMR Trust with office space,
office equipment and personnel necessary to manage and administer the Trusts'
operations. This includes:

     o  complying with reporting requirements;

     o  corresponding with shareholders;

     o  maintaining internal bookkeeping, accounting and auditing services and
        records; and

     o  supervising the provision of services to the Trusts by third parties.

     Management fees for the AAdvantage Trust for the fiscal years ended October
31 were approximately as follows: 1997, $13,730,443, of which approximately
$7,061,014 was paid by the Manager to other investment advisers; 1998,
$17,230,000, of which approximately $8,675,000 was paid by the Manager to other
investment advisers; and 1999, $16,283,000, of which approximately $8,551,000
was paid by the Manager to other investment advisers. Management fees in the
amount of approximately $7,309, $407,195, and $48,000 were waived by the Manager
during the fiscal years ended October 31, 1997, 1998 and 1999 respectively.
These amounts include payments by Portfolios in the AAdvantage Trust other than
the Funds.

     Management fees for the Mileage Trust for the fiscal years ended October 31
were approximately as follows: 1997, $13,730,443, of which $7,061,014 was paid
by the Manager to other investment advisers; 1998, $17,230,000 of which
approximately $8,675,000 was paid by the Manager to other investment advisers;
and 1999, $16,283,000, of which approximately $8,551,000 was paid by the Manager
to other investment advisers. Management fees in the amount of approximately
$7,309 $407,195 and $48,000 were waived by the Manager during the fiscal years
ended October 31, 1997, 1998 and 1999.

     In addition to the management fee, the Manager is paid an administrative
services fee for providing administrative and management services (other than
investment advisory services) to the Funds. Administrative services fees for the
AAdvantage Trust for the fiscal years ended October 31 were approximately as
follows: 1997, $4,538,345; 1998, $7,476,000; and 1999, $10,120,000. These
amounts include payments by Portfolios in the AAdvantage Trust other than the
Funds. Administrative service fees for the Mileage Trust for the fiscal years
ended October 31, 1997, 1998 and 1999 were approximately $275,120, $548,000 and
$1,324,000, respectively.

     The Manager (or another entity approved by the Board) under a distribution
plan adopted pursuant to Rule 12b-1 under the 1940 Act, is paid 0.25% per annum
of the average daily net assets of each Mileage Fund for distribution-related
services, including costs of advertising and AAdvantage Miles. Distribution fees
pursuant to Rule 12b-1 under the 1940 Act for the fiscal years ended October 31,
1997, 1998 and 1999 were approximately $470,306, $632,000 and $764,000,
respectively.

     The Manager receives compensation for administrative and oversight
functions with respect to securities lending of the Portfolios of the AMR Trust.
Fees received by the Manager from securities lending for the fiscal years ended
October 31, 1997, 1998 and 1999 were approximately $81,113, $175,025 and
$213,000.

     SWS Financial Services, located at 7001 Preston Road, Dallas, Texas 75205,
is the distributor and principal underwriter of the Funds' shares and, as such,
receives an annualized fee of $50,000 from the Manager for distributing shares
of the AAdvantage and Mileage Trusts and the Select Funds.

                                       7

<PAGE>   196


                             OTHER SERVICE PROVIDERS

     The transfer agent for the Trust is State Street Bank & Company ("State
Street"), Boston, Massachusetts, who provides transfer agency services to Fund
shareholders directly and through its affiliate National Financial Data
Services, Kansas City, Missouri. State Street also serves as custodian for the
Portfolios of the AMR Trust and the Funds. The independent auditor for the Funds
and the AMR Trust is Ernst & Young LLP, Dallas, Texas.

                               REDEMPTIONS IN KIND

     Although each Fund intends to redeem shares in cash, each reserves the
right to pay the redemption price in whole or in part by a distribution of
readily marketable securities held by the applicable Fund's corresponding
Portfolio. However, shareholders always will be entitled to redeem shares for
cash up to the lesser of $250,000 or 1% of the applicable Fund's net asset value
during any 90 day period. Redemption in kind is not as liquid as a cash
redemption. In addition, if redemption is made in kind, shareholders who receive
securities and sell them could receive less than the redemption value of their
securities and could incur certain transaction costs.

                                 NET ASSET VALUE

     It is the policy of the Funds to attempt to maintain a constant price per
share of $1.00. There can be no assurance that a $1.00 net asset value per share
will be maintained. The portfolio instruments held by each Fund's corresponding
Portfolio are valued based on the amortized cost valuation technique pursuant to
Rule 2a-7 under the 1940 Act. This involves valuing an instrument at its cost
and thereafter assuming a constant amortization to maturity of any discount or
premium, even though the portfolio security may increase or decrease in market
value. Such market fluctuations are generally in response to changes in interest
rates. Use of the amortized cost valuation method requires the Funds'
corresponding Portfolios to purchase instruments having remaining maturities of
397 days or less, to maintain a dollar-weighted average portfolio maturity of 90
days or less, and to invest only in securities determined by the AMR Trust Board
to be of high quality with minimal credit risks. The corresponding portfolios of
the Money Market Funds may invest in issuers or instruments that at the time of
purchase have received the highest short-term rating by two Rating
Organizations, such as "D-1" by Duff & Phelps and "F-1" by Fitch IBCA, Inc., and
have received the next highest short-term rating by other Rating Organizations,
such as "A-2" by Standard & Poor's and "P-2" by Moody's Investors Service, Inc.
See "Ratings of Municipal Obligations" and "Ratings of Short-Term Obligations"
for further information concerning ratings.

                                 TAX INFORMATION

TAXATION OF THE FUNDS

     To qualify for treatment as a regulated investment company ("RIC") under
the Internal Revenue Code of 1986, as amended ("Code"), each Fund (each of which
is treated as a separate corporation for these purposes) must, among other
requirements:

     o  Derive at least 90% of its gross income each taxable year from
        dividends, interest, payments with respect to securities loans and gains
        from the sale or other disposition of securities or certain other
        income;

     o  Diversify its investments in securities within certain statutory limits
        ("Diversification Requirement"); and

     o  Distribute annually to its shareholders at least 90% of its investment
        company taxable income (generally, taxable net investment income plus
        net short-term capital gain) plus, in the case of the Municipal Money
        Market Funds, net interest income excludable from gross income under
        Section 103(a) of the Code ("Distribution Requirement").

     Each Fund, as an investor in its corresponding Portfolio, is deemed to own
a proportionate share of the Portfolio's assets and to earn the income on that
share for purposes of determining whether the Fund satisfies the Income and
Diversification Requirements. If a Fund failed to qualify as a RIC for any
taxable year, it would be taxed on the full amount of its taxable income for
that year without being able to deduct the distributions it makes to its
shareholders and the shareholders would treat all those distributions as
dividends (that is, ordinary income) to the extent of the Fund's earnings and
profits.

                                       8

<PAGE>   197


TAXATION OF THE PORTFOLIOS

     Each Portfolio should be classified as a separate partnership for federal
income tax purposes and is not a "publicly traded partnership." As a result,
each Portfolio is not or should not be subject to federal income tax; instead,
each investor in a Portfolio, such as a Fund, is required to take into account
in determining its federal income tax liability its share of the Portfolio's
income, gains, losses, deductions, credits and tax preference items, without
regard to whether it has received any cash distributions from the Portfolio.

     Because, as noted above, each Fund is deemed to own a proportionate share
of its corresponding Portfolio's assets and to earn a proportionate share of its
corresponding Portfolio's income for purposes of determining whether the Fund
satisfies the requirements to qualify as a RIC, each Portfolio intends to
conduct its operations so that its corresponding Fund will be able to satisfy
all those requirements.

     Distributions to a Fund from its corresponding Portfolio (whether pursuant
to a partial or complete withdrawal or otherwise) will not result in the Fund's
recognition of any gain or loss for federal income tax purposes, except that (1)
gain will be recognized to the extent any cash that is distributed exceeds the
Fund's basis for its interest in the Portfolio before the distribution, (2)
income or gain will be recognized if the distribution is in liquidation of the
Fund's entire interest in the Portfolio and includes a disproportionate share of
any unrealized receivables held by the Portfolio and (3) loss will be recognized
if a liquidation distribution consists solely of cash and/or unrealized
receivables. A Fund's basis for its interest in its corresponding Portfolio
generally will equal the amount of cash and the basis of any property the Fund
invests in the Portfolio, increased by the Fund's share of the Portfolio's net
income and gains and decreased by (a) the amount of cash and the basis of any
property the Portfolio distributes to the Fund and (b) the Fund's share of the
Portfolio's losses.

     The Municipal Money Market Funds' corresponding Portfolio may acquire zero
coupon or other securities issued with original issue discount. As investors in
the Portfolio that holds those securities, the Municipal Money Market Funds
would have to include in their income their share of the original issue discount
that accrues on the securities during the taxable year, even if the Portfolio
(and, hence, the Funds) receive no corresponding payment on the securities
during the year. Because each Fund annually must distribute substantially all of
its investment company taxable income, including any original issue discount, to
satisfy the Distribution Requirement and avoid imposition of the 4% excise tax
described in the Prospectus, each Municipal Money Market Fund may be required in
a particular year to distribute as a dividend an amount that is greater than the
total amount of cash it actually receives. Those distributions would be made
from the Fund's cash assets, if any, or the proceeds of redemption of a portion
of each Municipal Money Market Fund's interest in its corresponding Portfolio
(which redemption proceeds would be paid from the Portfolio's cash assets or the
proceeds of sales of portfolio securities, if necessary). The Portfolio might
realize capital gains or losses from any such sales, which would increase or
decrease each Municipal Money Market Fund's investment company taxable income
and/or net capital gain (the excess of net long-term capital gain over net
short-term capital loss).

TAXATION OF THE FUNDS' SHAREHOLDERS

     Distributions by the Municipal Money Market Funds of the amount by which
the Funds' shares of their corresponding Portfolio's income on tax-exempt
securities exceeds certain amounts disallowed as deductions, designated by the
Funds as "exempt-interest dividends," generally may be excluded from gross
income by their shareholders. Dividends paid by the Municipal Money Market Funds
will qualify as exempt-interest dividends if, at the close of each quarter of
the taxable year, at least 50% of the value of each Fund's total assets
(including its share of the Municipal Money Market Portfolio's assets) consists
of securities the interest on which is excludable from gross income under
Section 103(a) of the Code. The Municipal Money Market Funds intend to continue
to satisfy this requirement. The aggregate dividends excludable from
shareholders' gross income may not exceed the Municipal Money Market Funds' net
tax-exempt income. The shareholders' treatment of dividends from the Municipal
Money Market Funds under state and local income tax laws may differ from the
treatment thereof under the Code.

     Exempt-interest dividends received by a corporate shareholder may be
indirectly subject to the alternative minimum tax. In addition, entities or
persons who are "substantial users" (or persons related to "substantial users")
of facilities financed by private activity bonds ("PABs") or industrial
development bonds ("IDBs") should consult their tax advisers before purchasing
shares of either Municipal Money Market Fund because, for users of certain of
these facilities, the interest on those bonds is not exempt from federal income
tax. For these purposes, the term "substantial user" is defined generally to
include a "non-exempt person" who regularly uses in trade or business a part of
a facility financed from the proceeds of PABs or IDBs.

                                       9

<PAGE>   198


     Up to 85% of social security and railroad retirement benefits may be
included in taxable income for recipients whose adjusted gross income (including
income from tax-exempt sources such as the Municipal Money Market Funds) plus
50% of their benefits exceeds certain base amounts. Exempt-interest dividends
from the Municipal Money Market Funds still are tax-exempt to the extent
described above; they are only included in the calculation of whether a
recipient's income exceeds the established amounts.

     The foregoing is only a summary of some of the important federal tax
considerations affecting the Funds and their shareholders and is not intended as
a substitute for careful tax planning. Accordingly, prospective investors are
advised to consult their own tax advisers for more detailed information
regarding the above and for information regarding federal, state, local and
foreign taxes.

                        YIELD AND TOTAL RETURN QUOTATIONS

     The Platinum Class of the AAdvantage Trust commenced operations on November
7, 1995, the Platinum Class of the Money Market Mileage Fund commenced
operations on January 29, 1996, and the Platinum Class of the Municipal Money
Market Mileage Fund and the U.S. Government Money Market Mileage Fund commenced
operations on November 1, 1999. For purposes of advertising performance, and in
accordance with Securities and Exchange Commission staff interpretations, the
Funds in the AAdvantage Trust have adopted the performance of the Institutional
Class of the Funds in the AAdvantage Trust for periods prior to their inception
date. The Mileage Funds have adopted the performance of the Institutional Class
of the Funds in the AAdvantage Trust (except the Municipal Money Market Mileage
Fund), the Mileage Class of the Funds in the AAdvantage Trust, and the Mileage
Class of the Funds in the Mileage Trust for periods prior to their inception
date. The performance results for the Platinum Class is lower, because the
expenses for the other classes (except for the Mileage Funds) do not reflect the
12b-1 fees, Administrative Services Plan fees or other class expenses that will
be borne by the Platinum Class.

     A quotation of yield on shares of the Funds may appear from time to time in
advertisements and in communications to shareholders and others. Quotations of
yields are indicative of yields for the limited historical period used but not
for the future. Yield will vary as interest rates and other conditions change.
Yield also depends on the quality, length of maturity and type of instruments
invested in by the Funds, and the applicable Fund's operating expenses. A
comparison of the quoted yields offered for various investments is valid only if
yields are calculated in the same manner. In addition, other similar investment
companies may have more or less risk due to differences in the quality or
maturity of securities held.

     The yields of the Funds may be calculated in one of two ways:

     (1) Current Yield--the net average annualized return without compounding
     accrued interest income. For a 7-day current yield, this is computed by
     dividing the net change in value over a 7 calendar-day period of a
     hypothetical account having one share at the beginning of a 7 calendar-day
     period by the value of the account at the beginning of this period to
     determine the "base period return". The quotient is multiplied by 365
     divided by 7 and stated to two decimal places. A daily current yield is
     calculated by multiplying the net change in value over one day by 365 and
     stating it to two decimal places. Income other than investment income and
     capital changes, such as realized gains and losses from the sale of
     securities and unrealized appreciation and depreciation, are excluded in
     calculating the net change in value of an account. However, this
     calculation includes the aggregate fees and other expenses that are charged
     to all shareholder accounts in a Fund. In determining the net change in
     value of a hypothetical account, this value is adjusted to reflect the
     value of any additional shares purchased with dividends from the original
     share and dividends declared on both the original share and any such
     additional shares.

     (2) Effective Yield--the net average annualized return as computed by
     compounding accrued interest income. In determining the 7-day effective
     yield, a Fund will compute the "base period return" in the same manner used
     to compute the "current yield" over a 7 calendar-day period as described
     above. One is then added to the base period return and the sum is raised to
     the 365/7 power. One is subtracted from the result, according to the
     following formula:

                                                        (365/7)
             EFFECTIVE YIELD = [(BASE PERIOD RETURN + 1)       ] - 1

     The current and effective yields for the Funds are as follows:

                                       10

<PAGE>   199


<TABLE>
<CAPTION>
                                            Current daily      Current yield for the   Effective yield for the
                                             yield as of         seven-day period        seven-day period
                                             December 31,       ended December 31,      ended December 31,
                                                 1999                  1999                    1999
                                                 ----                  ----                    ----

<S>                                              <C>                   <C>                     <C>
Platinum Class
  Money Market Fund                              4.70%                 4.85%                   4.96%
  Municipal Money Market Fund                    3.92%                 3.65%                   3.71%
  U.S. Government Money Market Fund              4.47%                 4.74%                   4.86%
  Money Market Mileage Fund                      4.62%                 4.76%                   4.88%
  Municipal Money Market Mileage Fund            3.64%                 3.45%                   3.51%
  U.S. Gov't. Money Market Mileage Fund          4.63%                 4.82%                   4.93%
</TABLE>

     The Municipal Money Market Funds also may advertise a tax-equivalent
current and effective yield. The tax-equivalent yields are calculated as
follows:

     CURRENT YIELD/(1 - APPLICABLE TAX RATE) = CURRENT TAX-EQUIVALENT YIELD

   EFFECTIVE YIELD/(1 - APPLICABLE TAX RATE) = EFFECTIVE TAX-EQUIVALENT YIELD

Based on these formulas and a 39.6% personal tax rate, the current and effective
tax equivalent yields for the Municipal Money Market Funds for the seven-day
period ending December 31, 1999 were:

<TABLE>
<CAPTION>
                                             Current                         Effective
Class                                  Tax Equivalent Yield            Tax Equivalent Yield
- -----                                  --------------------            --------------------
<S>                                           <C>                              <C>
Municipal Money Market Fund                   6.04%                            6.14%
Municipal Money Market Mileage Fund           5.71%                            5.81%
</TABLE>

     The advertised total return for a class of a Fund would be calculated by
equating an initial amount invested in a class of a Fund to the ending
redeemable value, according to the following formula:

                                         (n)
                                 P(1 + T)   = ERV

where "P" is a hypothetical initial payment of $1,000; "T" is the average annual
total return for the Fund; "n" is the number of years involved; and "ERV" is the
ending redeemable value of a hypothetical $1,000 payment made in the Fund at the
beginning of the investment period covered.

     Based on this formula, annualized total returns were as follows for the
periods indicated:

<TABLE>
<CAPTION>

                                                                                                   For the period
                                                                                                        from
                                                   For the one-     For the five-    For the ten-   commencement
                                                   year period      year period      year period    of operations
                                                     ended            ended             ended          through
                                                   December 31,     December 31,     December 31,    December 31,
                                                     1999(1)          1999(1)           1999(1)        1999(1)
                                                     -------          -------           -------        -------

<S>                                                   <C>              <C>              <C>             <C>
Platinum Class
  Money Market Fund                                   4.41%            4.96%            5.14%           5.75%
  Municipal Money Market Fund                         2.34%            2.86%             N/A(2)         2.81%
  U. S. Gov't. Money Market Fund(3)                   4.20%            4.72%             N/A(2)         4.30%
  Money Market Mileage Fund                           4.30%            4.80%            4.97%           5.61%
  Municipal Money Market Mileage Fund                 2.69%            3.11%             N/A(2)         2.96%
  U.S. Gov't. Money Market Mileage Fund(3)            4.55%            4.98%             N/A(2)         4.42%
</TABLE>

(1) Performance of the Funds of the AAdvantage Trust represents total returns
achieved by the Institutional Class from the inception date of each Fund up to
the inception date of the Platinum Class on 11/7/95. Performance of the Money
Market Mileage Fund represents total returns of the Money Market
Fund-Institutional Class (9/1/87-10/31/91), the Money Market Fund-Mileage Class
(11/1/91-10/31/95), the Money Market Mileage Fund-Mileage Class
(11/1/95-1/28/96) and the Money Market Mileage Fund-Platinum Class since its
1/29/96 inception. Performance of the Municipal Money Market Mileage Fund
represents total returns of the Municipal Money Market Fund-Mileage Class
(11/10/93-10/31/95), the Municipal Money Market Mileage Fund-Mileage Class
(11/1/95-10/31/99) and the Municipal Money Market Mileage Fund-Platinum Class
since its 11/1/99 inception. Performance of the U.S. Government Money Market
Mileage Fund represents total returns of the U.S. Government Money Market
Fund-Institutional Class (3/2/92-10/31/93), the U.S. Government Money Market
Fund-Mileage Class (11/1/93-10/31/95), the U.S.

                                       11

<PAGE>   200


Government Money Market Mileage Fund-Mileage Class (11/1/95-10/31/99) and the
U.S. Government Money Market Mileage Fund-Platinum Class since its 11/1/99
inception. Total returns have not been adjusted for any difference between the
fees and expenses of each Fund and the historical fees and expenses of the
predecessor Funds. Inception dates are: Money Market Fund-Institutional Class,
9/1/87; Municipal Money Market Fund-Institutional Class, 11/10/93; U.S.
Government Money Market Fund-Institutional Class, 3/1/92.

(2) The Fund was not operational during this period.

(3) Prior to March 1, 1997, the U.S. Government Money Market Fund was known as
the U.S. Treasury Money Market Fund and operated under different investment
policies.

     Each Fund also may use "aggregate" total return figures for various periods
which represent the cumulative change in value of an investment in a Fund for
the specific period. Such total returns reflect changes in share prices of a
Fund and assume reinvestment of dividends and distributions.

     In reports or other communications to shareholders or in advertising
material, each class of a Fund may from time to time compare its performance
with that of other mutual funds in rankings prepared by Lipper Analytical
Services, Inc., Morningstar, Inc., IBC Financial Data, Inc. and other similar
independent services which monitor the performance of mutual funds or
publications such as the "New York Times," "Barrons" and the "Wall Street
Journal." Each Fund also may compare its performance with various indices
prepared by independent services such as Standard & Poor's, Merrill Lynch,
Morgan Stanley or Lehman Brothers or to unmanaged indices that may assume
reinvestment of dividends but generally do not reflect deductions for
administrative and management costs.

     Advertisements for the Funds may mention that the Funds offer a variety of
investment options. They also may compare the Funds to federally insured
investments such as bank certificates of deposit and credit union deposits,
including the long-term effects of inflation on these types of investments.
Advertisements also may compare the historical rate of return of different types
of investments. Information concerning broker-dealers who sell the Funds also
may appear in advertisements for the Funds, including their ranking as
established by various publications compared to other broker-dealers. A
description of the characteristics of the AAdvantage program may appear in Fund
advertisements, including its ranking as compared to other frequent flyer
programs by various publications.

     From time to time, the Manager may offer special promotions as a means to
attract new Mileage Fund shareholders. Such promotions may include contests with
free air travel and/or hotel accommodations as prizes. In addition, the Manager
may offer special AAdvantage mile awards to those who open a Mileage Fund
account during a certain limited time period. In these type of promotion, an
investor would receive one AAdvantage mile for each dollar invested a in Mileage
Fund (up to a maximum investment dollar limit), in addition to one AAdvantage
mile for each ten dollars maintained in a Mileage Fund on an ongoing basis. This
offer may be targeted to a specific number of individuals selected from the
AAdvantage program membership database by applying various search criteria.

                            DESCRIPTION OF THE TRUSTS

     The AAdvantage Trust, organized on January 16, 1987 and the Mileage Trust,
organized on February 22, 1995, (originally named American AAdvantage Funds II)
are entities of the type commonly known as a "Massachusetts business trust."
Under Massachusetts law, shareholders of such a trust may, under certain
circumstances, be held personally liable for its obligations. However, each
Trust's Declaration of Trust contains an express disclaimer of shareholder
liability for acts or obligations of the Trust and provides for indemnification
and reimbursement of expenses out of Trust property for any shareholder held
personally liable for the obligations of the Trust. The Declaration of Trust
also provides that the Trusts may maintain appropriate insurance (for example,
fidelity bonding) for the protection of the Trust, its shareholders, Trustees,
officers, employees and agents to cover possible tort and other liabilities.
Thus, the risk of a shareholder incurring financial loss due to shareholder
liability is limited to circumstances in which both inadequate insurance existed
and the Trust itself was unable to meet its obligations. The Trust has not
engaged in any other business. The Platinum Class was created as an investment
vehicle for cash balances of customers of certain broker-dealers.

                                OTHER INFORMATION

     Asset-Backed Securities-Through the use of trusts and special purpose
subsidiaries, various types of assets (primarily home equity loans, automobile
and credit card receivables, other types of receivables/assets as well as
purchase contracts, financing leases and sales agreements entered into by
municipalities) are securitized in pass-through structures similar to
Mortgage-Backed Securities, as described below. The

                                       12

<PAGE>   201


Portfolios are permitted to invest in asset-backed securities, subject to the
Portfolios' rating and quality requirements.

     Bank Deposit Notes-Bank deposit notes are obligations of a bank, rather
than bank holding company corporate debt. The only structural difference between
bank deposit notes and certificates of deposit is that interest on bank deposit
notes is calculated on a 30/360 basis as are corporate notes/bonds. Similar to
certificates of deposit, deposit notes represent bank level investments and,
therefore, are senior to all holding company corporate debt.

     Bankers' Acceptances-Bankers' acceptances are short-term credit instruments
designed to enable businesses to obtain funds to finance commercial
transactions. Generally, an acceptance is a time draft drawn on a bank by an
exporter or an importer to obtain a stated amount of funds to pay for specific
merchandise. The draft is then "accepted" by a bank that, in effect,
unconditionally guarantees to pay the face value of the instrument on its
maturity date. The acceptance may then be held by the accepting bank as an
earning asset or it may be sold in the secondary market at the going rate of
discount for a specific maturity. Although maturities for acceptances can be as
long as 270 days, most acceptances have maturities of six months or less.

     Cash Equivalents-Cash equivalents include certificates of deposit, bearer
deposit notes, bankers' acceptances, government obligations, commercial paper,
short-term corporate debt securities and repurchase agreements.

     Certificates of Deposit-Certificates of deposit are issued against funds
deposited in an eligible bank (including its domestic and foreign branches,
subsidiaries and agencies), are for a definite period of time, earn a specified
rate of return and are normally negotiable.

     Commercial Paper-Commercial paper refers to promissory notes representing
an unsecured debt of a corporation or finance company with a fixed maturity of
no more than 270 days. A variable amount master demand note (which is a type of
commercial paper) represents a direct borrowing arrangement involving
periodically fluctuating rates of interest under a letter agreement between a
commercial paper issuer and an institutional lender pursuant to which the lender
may determine to invest varying amounts.

     Derivatives-Generally, a derivative is a financial arrangement, the value
of which is based on, or "derived" from, a traditional security, asset or market
index. Some "derivatives" such as mortgage-related and other asset-backed
securities are in many respects like any other investment, although they may be
more volatile or less liquid than more traditional debt securities. There are,
in fact, many different types of derivatives and many different ways to use
them. There are a range of risks associated with those uses.

     Eurodollar and Yankeedollar obligations-Eurodollar obligations are U.S.
dollar obligations issued outside the United States by domestic or foreign
entities, while Yankeedollar obligations are U.S. dollar obligations issued
inside the United States by foreign entities. There is generally less publicly
available information about foreign issuers and there may be less governmental
regulation and supervision of foreign stock exchanges, brokers and listed
companies. Foreign issuers may use different accounting and financial standards,
and the addition of foreign governmental restrictions may affect adversely the
payment of principal and interest on foreign investments. In addition, not all
foreign branches of United States banks are supervised or examined by regulatory
authorities as are United States banks, and such branches may not be subject to
reserve requirements.

     Full Faith and Credit Obligations of the U.S. Government-Securities issued
or guaranteed by the U.S. Treasury, backed by the full taxing power of the U.S.
Government or the right of the issuer to borrow from the U.S. Treasury.

     General Obligation Bonds-General obligation bonds are secured by the pledge
of the issuer's full faith, credit, and usually, taxing power. The taxing power
may be an unlimited ad valorem tax or a limited tax, usually on real estate and
personal property. Most states do not tax real estate, but leave that power to
local units of government.

     Illiquid Securities-Historically, illiquid securities have included
securities subject to contractual or legal restrictions on resale because they
have not been registered under the 1933 Act, securities that are otherwise not
readily marketable and repurchase agreements having a remaining maturity of
longer than seven calendar days. Securities that have not been registered under
the 1933 Act are referred to as private placements or

                                       13

<PAGE>   202


restricted securities and are purchased directly from the issuer or in the
secondary market. Mutual funds do not typically hold a significant amount of
these restricted or other illiquid securities because of the potential for
delays on resale and uncertainty in valuation. Limitations on resale may have an
adverse effect on the marketability of portfolio securities and a mutual fund
might be unable to dispose of restricted or other illiquid securities promptly
or at reasonable prices and might thereby experience difficulty satisfying
redemptions within seven calendar days. A mutual fund also might have to
register such restricted securities in order to dispose of them resulting in
additional expense and delay. Adverse market conditions could impede such a
public offering of securities.

     In recent years, however, a large institutional market has developed for
certain securities that are not registered under the 1933 Act, including
repurchase agreements, commercial paper, foreign securities, municipal
securities and corporate bonds and notes. Institutional investors depend on an
efficient institutional market in which the unregistered security can be readily
resold or on an issuer's ability to honor a demand for repayment. However, the
fact that there are contractual or legal restrictions on resale of such
investments to the general public or to certain institutions may not be
indicative of their liquidity.

     Loan Participation Interests-Loan participation interests represent
interests in bank loans made to corporations. The contractual arrangement with
the bank transfers the cash stream of the underlying bank loan to the
participating investor. Because the issuing bank does not guarantee the
participations, they are subject to the credit risks generally associated with
the underlying corporate borrower. In addition, because it may be necessary
under the terms of the loan participation for the investor to assert through the
issuing bank such rights as may exist against the underlying corporate borrower,
in the event the underlying corporate borrower fails to pay principal and
interest when due, the investor may be subject to delays, expenses and risks
that are greater than those that would have been involved if the investor had
purchased a direct obligation (such as commercial paper) of such borrower.
Moreover, under the terms of the loan participation, the investor may be
regarded as a creditor of the issuing bank (rather than of the underlying
corporate borrower), so that the issuer also may be subject to the risk that the
issuing bank may become insolvent. Further, in the event of the bankruptcy or
insolvency of the corporate borrower, the loan participation may be subject to
certain defenses that can be asserted by such borrower as a result of improper
conduct by the issuing bank. The secondary market, if any, for these loan
participations is extremely limited and any such participations purchased by the
investor are regarded as illiquid.

     Loan Transactions-Loan transactions involve the lending of securities to a
broker-dealer or institutional investor for its use in connection with short
sales, arbitrages or other security transactions. The purpose of a qualified
loan transaction is to afford a lender the opportunity to continue to earn
income on the securities loaned and at the same time earn fee income or income
on the collateral held by it.

     Securities loans will be made in accordance with the following conditions:
(1) the Portfolio must receive at least 100% collateral in the form of cash or
cash equivalents, securities of the U.S. Government and its agencies and
instrumentalities, and approved bank letters of credit; (2) the borrower must
increase the collateral whenever the market value of the loaned securities
(determined on a daily basis) rises above the level of collateral; (3) the
Portfolio must be able to terminate the loan after notice, at any time; (4) the
Portfolio must receive reasonable interest on the loan or a flat fee from the
borrower, as well as amounts equivalent to any dividends, interest or other
distributions on the securities loaned, and any increase in market value of the
loaned securities; (5) the Portfolio may pay only reasonable custodian fees in
connection with the loan; and (6) voting rights on the securities loaned may
pass to the borrower, provided, however, that if a material event affecting the
investment occurs, the AMR Trust Board must be able to terminate the loan and
vote proxies or enter into an alternative arrangement with the borrower to
enable the AMR Trust Board to vote proxies.

     While there may be delays in recovery of loaned securities or even a loss
of rights in collateral supplied should the borrower fail financially, loans
will be made only to firms deemed by the AMR Trust Board to be of good financial
standing and will not be made unless the consideration to be earned from such
loans would justify the risk. If the borrower of the securities fails
financially, there is a risk of delay in recovery of the securities loaned or
loss of rights in the collateral. Such loan transactions are referred to in this
Statement of Additional Information as "qualified" loan transactions.

     The cash collateral so acquired through qualified loan transactions may be
invested only in those categories of high quality liquid securities previously
authorized by the AMR Trust Board.

                                       14

<PAGE>   203


     Mortgage-Backed Securities-Mortgage-backed securities consist of both
collateralized mortgage obligations and mortgage pass-through certificates.

          Collateralized Mortgage Obligations ("CMOs")-CMOs and interests in
     real estate mortgage investment conduits ("REMICs") are debt securities
     collateralized by mortgages, or mortgage pass-through securities. CMOs
     divide the cash flow generated from the underlying mortgages or mortgage
     pass-through securities into different groups referred to as "tranches,"
     which are then retired sequentially over time in order of priority. The
     principal governmental issuers of such securities are the Federal National
     Mortgage Association ("FNMA"), a government sponsored corporation owned
     entirely by private stockholders and the Federal Home Loan Mortgage
     Corporation ("FHLMC"), a corporate instrumentality of the United States
     created pursuant to an act of Congress which is owned entirely by Federal
     Home Loan Banks. The issuers of CMOs are structured as trusts or
     corporations established for the purpose of issuing such CMOs and often
     have no assets other than those underlying the securities and any credit
     support provided. A REMIC is a mortgage securities vehicle that holds
     residential or commercial mortgages and issues securities representing
     interests in those mortgages. A REMIC may be formed as a corporation,
     partnership, or segregated pool of assets. The REMIC itself is generally
     exempt from federal income tax, but the income from the mortgages is
     reported by investors. For investment purposes, interests in REMIC
     securities are virtually indistinguishable from CMOs.

          Mortgage Pass-Through Certificates-Mortgage pass-through certificates
     are issued by governmental, government-related and private organizations
     which are backed by pools of mortgage loans.

          (1) Government National Mortgage Association ("GNMA") Mortgage
     Pass-Through Certificates ("Ginnie Maes")-GNMA is a wholly-owned U.S.
     Government corporation within the Department of Housing and Urban
     Development. Ginnie Maes represent an undivided interest in a pool of
     mortgages that are insured by the Federal Housing Administration or the
     Farmers Home Administration or guaranteed by the Veterans Administration.
     Ginnie Maes entitle the holder to receive all payments (including
     prepayments) of principal and interest owed by the individual mortgagors,
     net of fees paid to GNMA and to the issuer which assembles the mortgage
     pool and passes through the monthly mortgage payments to the certificate
     holders (typically, a mortgage banking firm), regardless of whether the
     individual mortgagor actually makes the payment. Because payments are made
     to certificate holders regardless of whether payments are actually received
     on the underlying mortgages, Ginnie Maes are of the "modified pass-through"
     mortgage certificate type. The GNMA is authorized to guarantee the timely
     payment of principal and interest on the Ginnie Maes. The GNMA guarantee is
     backed by the full faith and credit of the United States, and the GNMA has
     unlimited authority to borrow funds from the U.S. Treasury to make payments
     under the guarantee. The market for Ginnie Maes is highly liquid because of
     the size of the market and the active participation in the secondary market
     of security dealers and a variety of investors.

          (2) FHLMC Mortgage Participation Certificates ("Freddie Macs")-Freddie
     Macs represent interests in groups of specified first lien residential
     conventional mortgages underwritten and owned by the FHLMC. Freddie Macs
     entitle the holder to timely payment of interest, which is guaranteed by
     the FHLMC. The FHLMC guarantees either ultimate collection or timely
     payment of all principal payments on the underlying mortgage loans. In
     cases where the FHLMC has not guaranteed timely payment of principal, the
     FHLMC may remit the amount due because of its guarantee of ultimate payment
     of principal at any time after default on an underlying mortgage, but in no
     event later than one year after it becomes payable. Freddie Macs are not
     guaranteed by the United States or by any of the Federal Home Loan Banks
     and do not constitute a debt or obligation of the United States or of any
     Federal Home Loan Bank. The secondary market for Freddie Macs is highly
     liquid because of the size of the market and the active participation in
     the secondary market of the FHLMC, security dealers and a variety of
     investors.

          (3) FNMA Guaranteed Mortgage Pass-Through Certificates ("Fannie
     Maes")-Fannie Maes represent an undivided interest in a pool of
     conventional mortgage loans secured by first mortgages or deeds of trust,
     on one family or two to four family, residential properties. The FNMA is
     obligated to distribute scheduled monthly installments of principal and
     interest on the mortgages in the pool, whether or not received, plus full
     principal of any foreclosed or otherwise liquidated mortgages. The
     obligation of the FNMA under its guarantee is solely its obligation and is
     not backed by, nor entitled to, the full faith and credit of the United
     States.

          (4) Mortgage-Related Securities Issued by Private Organizations-Pools
     created by non-governmental issuers generally offer a higher rate of
     interest than government and government-related pools because

                                       15

<PAGE>   204


     there are no direct or indirect government guarantees of payments in such
     pools. However, timely payment of interest and principal of these pools is
     often partially supported by various enhancements such as
     over-collateralization and senior/subordination structures and by various
     forms of insurance or guarantees, including individual loan, title, pool
     and hazard insurance. The insurance and guarantees are issued by government
     entities, private insurers or the mortgage poolers. Although the market for
     such securities is becoming increasingly liquid, securities issued by
     certain private organizations may not be readily marketable.

     Municipal Lease Obligations ("MLOs")-MLOs are issued by state and local
governments and authorities to acquire land and a wide variety of equipment and
facilities. These obligations typically are not fully backed by the
municipality's credit and thus interest may become taxable if the lease is
assigned. If funds are not appropriated for the following year's lease payments,
a lease may terminate with the possibility of default on the lease obligation.
With respect to MLOs purchased by the corresponding Portfolio of the Municipal
Money Market Fund, the AMR Trust Board has established the following guidelines
for determining the liquidity of the MLOs in its portfolio, and, subject to
review by the AMR Trust Board, has delegated that responsibility to the
investment adviser: (1) the frequency of trades and quotes for the security; (2)
the number of dealers willing to purchase or sell the security and the number of
other potential buyers; (3) the willingness of dealers to undertake to make a
market in the security; (4) the nature of the marketplace trades; (5) the
likelihood that the marketability of the obligation will be maintained through
the time the security is held by the Portfolio; (6) the credit quality of the
issuer and the lessee; (7) the essentiality to the lessee of the property
covered by the lease and (8) for unrated MLOs, the MLOs' credit status analyzed
according to the factors reviewed by rating agencies.

     Private Activity Obligations-Private activity obligations are issued to
finance, among other things, privately operated housing facilities, pollution
control facilities, convention or trade show facilities, mass transit, airport,
port or parking facilities and certain facilities for water supply, gas,
electricity, sewage or solid waste disposal. Private activity obligations are
also issued to privately held or publicly owned corporations in the financing of
commercial or industrial facilities. The principal and interest on these
obligations may be payable from the general revenues of the users of such
facilities. Shareholders, depending on their individual tax status, may be
subject to the federal alternative minimum tax on the portion of a distribution
attributable to these obligations. Interest on private activity obligations will
be considered exempt from federal income taxes; however, shareholders should
consult their own tax advisers to determine whether they may be subject to the
federal alternative minimum tax.

     Ratings of Long-Term Obligations-The Portfolio utilizes ratings provided by
the following nationally recognized statistical rating organizations ("Rating
Organizations") in order to determine eligibility of long-term obligations.

     The two highest Moody's Investors Service, Inc. ("Moody's") ratings for
long-term obligations (or issuers thereof) are Aaa and Aa. Obligations rated Aaa
are judged by Moody's to be of the best quality. Obligations rated Aa are judged
to be of high quality by all standards. Together with the Aaa group, such debt
comprises what is generally known as high-grade debt. Moody's states that debt
rated Aa is rated lower than Aaa debt because margins of protection or other
elements make long-term risks appear somewhat larger than for Aaa debt. Moody's
also supplies numerical indicators 1, 2, and 3 to rating categories. The
modifier 1 indicates that the security is in the higher end of its rating
category; the modifier 2 indicates a mid-range ranking; and modifier 3 indicates
a ranking toward the lower end of the category.

     The two highest Standard & Poor's ratings for long-term obligations are AAA
and AA. Obligations rated AAA have the highest rating assigned by Standard &
Poor's. Capacity to pay interest and repay principal is extremely strong.
Obligations rated AA have a very strong capacity to pay interest and repay
principal and differs from the highest rated issues only in a small degree.

     Duff & Phelps' two highest ratings for long-term obligations are AAA and
AA. Obligations rated AAA have the highest credit quality with risk factors
being negligible. Obligations rated AA are of high credit quality and strong
protection factors. Risk is modest but may vary slightly from time to time
because of economic conditions.

     Thomson BankWatch ("BankWatch") long-term debt ratings apply to specific
issues of long-term debt and preferred stock. They specifically assess the
likelihood of an untimely repayment of principal or interest over the term to
maturity of the rated instrument. BankWatch's two highest ratings for long-term
obligations are AAA

                                       16

<PAGE>   205


and AA. Obligations rated AAA indicate that the ability to repay principal and
interest on a timely basis is very high. Obligations rated AA indicate a
superior ability to repay principal and interest on a timely basis, with limited
incremental risk compared to issues rated in the highest category.

     Fitch IBCA, Inc. ("Fitch") investment grade bond ratings provide a guide to
investors in determining the credit risk associated with a particular security.
The ratings represent Fitch's assessment of the issuer's ability to meet the
obligations of a specific debt issue or class of debt in a timely manner.
Obligations rated AAA are considered to be investment grade and of the highest
credit quality. The obligor has an exceptionally strong ability to pay interest
and repay principal, which is unlikely to be affected by reasonable foreseeable
events. Bonds rated AA are considered to be investment grade and of very high
credit quality. The obligor's ability to pay interest and repay principal is
very strong, although not quite as strong as bonds rated AAA.

     Standard & Poor's, Duff & Phelps and Fitch apply indicators, such as
"+","-," or no character, to indicate relative standing within the major rating
categories.

     Ratings of Municipal Obligations-Moody's ratings for state and municipal
short-term obligations are designated Moody's Investment Grade or "MIG" with
variable rate demand obligations being designated as "VMIG." A VMIG rating also
may be assigned to commercial paper programs which are characterized as having
variable short-term maturities but having neither a variable rate nor demand
feature. Factors used in determination of ratings include liquidity of the
borrower and short-term cyclical elements.

     Standard & Poor's uses SP-1, SP-2, and SP-3 to rate short-term municipal
obligations. A rating of SP-1 denotes a very strong or strong capacity to pay
principal and interest.

     Ratings of Short-term Obligations-The rating P-1 is the highest short-term
rating assigned by Moody's. Among the factors considered by Moody's in assigning
ratings are the following: (1) evaluations of the management of the issuer; (2)
economic evaluation of the issuer's industry or industries and an appraisal of
speculative-type risks which may be inherent in certain areas; (3) evaluation of
the issuer's products in relation to competition and customer acceptance; (4)
liquidity; (5) amount and quality of long-term debt; (6) trend of earnings over
a period of ten years; (7) financial strength of a parent company and the
relationships which exist with the issuer; and (8) recognition by the management
of obligations which may be present or may arise as a result of public interest
questions and preparations to meet such obligations.

     Short-term obligations (or issuers thereof) rated A-1 by Standard & Poor's
have the following characteristics. Liquidity ratios are adequate to meet cash
requirements. The issuer has access to at least two additional channels of
borrowing. Basic earnings and cash flow have an upward trend with allowance made
for unusual circumstances. Typically, the issuer's industry is well established
and the issuer has a strong position within the industry. The reliability and
quality of management are unquestioned. Relative strength or weakness of the
above factors determines whether the issuer's short-term obligation is rated
A-1, A-2, or A-3.

     The distinguishing feature of Duff & Phelps Credit Ratings' short-term
rating is the refinement of the traditional 1 category. The majority of
short-term debt issuers carry the highest rating, yet quality differences exist
within that tier. Obligations rated D-1+ indicate the highest certainty of
timely payment. Safety is just below risk-free U.S. Treasury obligations.
Obligations rated D-1 have a very high certainty of timely payment. Risk factors
are minor. Obligations rated D-1- have a high certainty of timely payment. Risk
factors are very small. Obligations rated D-2 have good certainty of timely
payment. Liquidity factors and company fundamentals are sound. Although ongoing
funding needs may enlarge total financing requirements, access to capital
markets is good. Risk factors are small.

     Thomson BankWatch short-term ratings are intended to assess the likelihood
of an untimely or incomplete payment of principal or interest. Obligations rated
TBW-1 indicate a very high likelihood that principal and interest will be paid
on a timely basis. While the degree of safety regarding timely payment of
principal and interest is strong for an obligation rated TBW-2, the relative
degree of safety is not as high as for issues rated TBW-1.

     Fitch's short-term ratings apply to debt obligations that are payable on
demand or have original maturities of generally up to three years, including
commercial paper, certificates of deposit, medium-term notes, and municipal and
investment notes. A rating of F-1+ indicates exceptionally strong credit
quality. Issues assigned this rating are regarded as having the strongest degree
of assurance for timely payment. Obligations rated F-1 have very strong credit
quality. Issues assigned this rating reflect an assurance of timely payment only
slightly

                                       17

<PAGE>   206


less in degree than issues rated F-1+. Issues assigned a rating of F-2 indicate
good credit quality. Issues assigned this rating have a satisfactory degree of
assurance for timely payment, but the margin of safety is not as great as for
issues assigned F-1+ and F-1 ratings.

     Repurchase Agreements-A repurchase agreement, which provides a means to
earn income on funds for periods as short as overnight, is an arrangement under
which the purchaser (e.g., a Portfolio) purchases securities and the seller
agrees, at the time of sale, to repurchase the securities at a specified time
and price. The repurchase price will be higher than the purchase price, the
difference being income to the purchaser, or the purchase and repurchase prices
may be the same, with interest at a stated rate due to the purchaser together
with the repurchase price on repurchase. In either case, the income to the
purchaser is unrelated to the interest rate on the securities subject to the
repurchase agreement.

     Each Portfolio may enter into repurchase agreements with any bank or
registered broker-dealer who, in the opinion of the Manager presents a minimum
risk of bankruptcy during the term of the agreement based upon guidelines that
periodically are reviewed by the AMR Trust Board. Each Portfolio may enter into
repurchase agreements as a short-term investment of its idle cash in order to
earn income. The securities will be held by a custodian (or agent) approved by
the AMR Trust Board during the term of the agreement. However, if the market
value of the securities subject to the repurchase agreement becomes less than
the repurchase price (including interest), the Portfolio will direct the seller
of the securities to deliver additional securities so that the market value of
all securities subject to the repurchase agreement will equal or exceed the
repurchase price.

     In the event of the commencement of bankruptcy or insolvency proceedings
with respect to the seller of the securities before the repurchase of the
securities under a repurchase agreement, a Portfolio may encounter a delay and
incur costs before being able to sell the security being held as collateral.
Delays may involve loss of interest or decline in price of the securities. Apart
from the risk of bankruptcy or insolvency proceedings, there is also the risk
that the seller may fail to repurchase the securities, in which case a Portfolio
may incur a loss if the proceeds to the Portfolio from the sale of the
securities to a third party are less than the repurchase price.

     Reverse Repurchase Agreements-The Portfolios may borrow funds for temporary
purposes by entering into reverse repurchase agreements. Pursuant to such
agreements, a Portfolio would sell portfolio securities to financial
institutions such as banks and broker/dealers and agree to repurchase them at a
mutually agreed-upon date and price. The Portfolios intend to enter into reverse
repurchase agreements only to avoid selling securities to meet redemptions
during market conditions deemed unfavorable by the investment adviser possessing
investment authority. At the time a Portfolio enters into a reverse repurchase
agreement, it will place in a segregated custodial account assets such as liquid
high quality debt securities having a value not less than 100% of the repurchase
price (including accrued interest), and will subsequently monitor the account to
ensure that such required value is maintained. Reverse repurchase agreements
involve the risk that the market value of the securities sold by a Portfolio may
decline below the price at which such Portfolio is obligated to repurchase the
securities. Reverse repurchase agreements are considered to be borrowings by an
investment company under the 1940 Act.

     Resource Recovery Obligations-Resource recovery obligations are a type of
municipal revenue obligation issued to build facilities such as solid waste
incinerators or waste-to-energy plants. Usually, a private corporation will be
involved and the revenue cash flow will be supported by fees or units paid by
municipalities for use of the facilities. The viability of a resource recovery
project, environmental protection regulations and project operator tax
incentives may affect the value and credit quality of these obligations.

     Revenue Obligations-Revenue obligations are backed by the revenue cash flow
of a project or facility.

     Section 4(2) Securities-Section 4(2) securities are restricted as to
disposition under the federal securities laws, and generally are sold to
institutional investors, such as the Portfolio, that agree they are purchasing
the securities for investment and not with an intention to distribute to the
public. Any resale by the purchaser must be pursuant to an exempt transaction
and may be accomplished in accordance with Rule 144A. Section 4(2) securities
normally are resold to other institutional investors through or with the
assistance of the issuer or dealers that make a market in the Section 4(2)
securities, thus providing liquidity.

     The AMR Trust Board and the applicable investment adviser will carefully
monitor the Portfolio's investments in Section 4(2) securities offered and sold
under Rule 144A, focusing on such important factors,

                                       18

<PAGE>   207


among others, as valuation, liquidity, and availability of information.
Investments in Section 4(2) securities could have the effect of reducing the
Portfolio's liquidity to the extent that qualified institutional buyers no
longer wish to purchase these restricted securities.

     Separately Traded Registered Interest and Principal Securities and Zero
Coupon Obligations-Separately traded registered interest and principal
securities or "STRIPS" and zero coupon obligations are securities that do not
make regular interest payments. Instead they are sold at a discount from their
face value. Each Portfolio will take into account as income a portion of the
difference between these obligations' purchase prices and their face values.
Because they do not pay coupon income, the prices of STRIPS and zero coupon
obligations can be very volatile when interest rates change. STRIPS are zero
coupon bonds issued by the U.S. Treasury.

     Tax, Revenue or Bond Anticipation Notes-Tax, revenue or bond anticipation
notes are issued by municipalities in expectation of future tax or other
revenues which are payable from these specific taxes or revenues. Bond
anticipation notes usually provide interim financing in advance of an issue of
bonds or notes, the proceeds of which are used to repay the anticipation notes.
Tax-exempt commercial paper is issued by municipalities to help finance
short-term capital or operating needs in anticipation of future tax or other
revenue.

     U.S. Government Securities-U.S. Government securities are issued or
guaranteed by the U.S. Government and include U.S. Treasury obligations (see
definition below) and securities issued by U.S. agencies and instrumentalities.

     U.S. Government agencies or instrumentalities that issue or guarantee
securities include, but are not limited to, the Federal Housing Administration,
Farmers Home Administration, Export-Import Bank of the United States, Small
Business Administration, GNMA, General Services Administration, Central Bank for
Cooperatives, Federal Home Loan Banks, FHLMC, Federal Intermediate Credit Banks,
Federal Land Banks, Maritime Administration, Tennessee Valley Authority,
District of Columbia Armory Board, Inter-American Development Bank,
Asian-American Development Bank, Agency for International Development, Student
Loan Marketing Association and International Bank of Reconstruction and
Development.

     Obligations of U.S. Government agencies and instrumentalities may or may
not be supported by the full faith and credit of the United States. Some are
backed by the right of the issuer to borrow from the Treasury; others are
supported by discretionary authority of the U.S. Government to purchase the
agencies' obligations; while still others, such as the Student Loan Marketing
Association, are supported only by the credit of the instrumentality. In the
case of securities not backed by the full faith and credit of the United States,
the investor must look principally to the agency issuing or guaranteeing the
obligation for ultimate repayment, and may not be able to assert a claim against
the United States itself in the event the agency or instrumentality does not
meet its commitment.

     U.S. Treasury Obligations-U.S. Treasury obligations include bills, notes
and bonds issued by the U.S. Treasury and Separately Traded Registered Interest
and Principal component parts of such obligations known as STRIPS.

     Variable or Floating Rate Obligations-A variable rate obligation is one
whose terms provide for the adjustment of its interest rate on set dates and
which, upon such adjustment, can reasonably be expected to have a market value
that approximates its par value. A floating rate obligation is one whose terms
provide for the adjustment of its interest rate whenever a specified interest
rate changes and which, at any time, can reasonably be expected to have a market
value that approximates its par value. Variable or floating rate obligations may
be secured by bank letters of credit.

     Pursuant to Rule 2a-7 under the 1940 Act, variable or floating rate
obligations with stated maturities of more than 397 days may be deemed to have
shorter maturities as follows:

     (1) An obligation that is issued or guaranteed by the United States
Government or any agency thereof which has a variable rate of interest
readjusted no less frequently than every 762 days will be deemed by a Portfolio
to have a maturity equal to the period remaining until the next readjustment of
the interest rate.

     (2) A variable rate obligation, the principal amount of which is scheduled
on the face of the instrument to be paid in 397 days or less, will be deemed by
a Portfolio to have a maturity equal to the period remaining until the next
readjustment of the interest rate.

                                       19

<PAGE>   208


     (3) A variable rate obligation that is subject to a demand feature will be
deemed by a Portfolio to have a maturity equal to the longer of the period
remaining until the next readjustment of the interest rate or the period
remaining until the principal amount can be recovered through demand.

     (4) A floating rate obligation that is subject to a demand feature will be
deemed by a Portfolio to have a maturity equal to the period remaining until the
principal amount can be recovered through demand.

     As used above, an obligation is "subject to a demand feature" when a
Portfolio is entitled to receive the principal amount of the obligation either
at any time on no more than 30 days' notice or at specified intervals not
exceeding one year and upon no more than 30 days' notice.

     Variable Rate Auction and Residual Interest Obligations-Variable rate
auction and residual interest obligations are created when an issuer or dealer
separates the principal portion of a long-term, fixed-rate municipal bond into
two long-term, variable-rate instruments. The interest rate on one portion
reflects short-term interest rates, while the interest rate on the other portion
is typically higher than the rate available on the original fixed-rate bond.

                              FINANCIAL STATEMENTS

     The American AAdvantage Money Market Funds' and the American AAdvantage
Money Market Mileage Funds' Annual Reports to Shareholders for the fiscal year
ended December 31, 1999, as audited by Ernst & Young, LLP, are supplied with the
SAI, and the financial statements and accompanying notes appearing therein are
incorporated by reference in this SAI.

                                       20
<PAGE>   209
                            AMERICAN AADVANTAGE FUNDS

                            PART C. OTHER INFORMATION


Item 23.          Exhibits

         (a)               Declaration of Trust - (iv)

         (b)               Bylaws - (iv)

         (c)               Voting trust agreement -- none

         (d)(i)(A)         Fund Management Agreement between American AAdvantage
                           Funds and AMR Investment Services, Inc. dated
                           April 3, 1987+

            (i)(B)         Supplement to Fund Management Agreement dated
                           August 1, 1994 - (iv)

            (i)(C)         Supplement to Fund Management Agreement dated
                           August 1, 1995 - (iv)

            (i)(D)         Supplement to Fund Management Agreement dated
                           November 1, 1995*

            (i)(E)         Amendment to Schedule A of Fund Management Agreement
                           dated December 1, 1995 - (i)

            (i)(F)         Supplement to Fund Management Agreement dated
                           December 17, 1996 - (ii)

            (i)(G)         Supplement to Fund Management Agreement dated
                           July 25, 1997 - (iii)

            (i)(H)         Supplement to Fund Management Agreement dated
                           September 1, 1998 - (vi)

            (i)(I)         Supplement to Fund Management Agreement dated
                           January 1, 1999*

           (ii)(A)         Investment Advisory Agreement between AMR Investment
                           Services, Inc. and Independence Investment
                           Associates, Inc. dated November 1, 1995 - (iv)

           (ii)(B)         Investment Advisory Agreement between AMR Investment
                           Services, Inc. and Templeton Investment Counsel, Inc.
                           dated November 1, 1995 - (iv)

           (ii)(C)         Investment Advisory Agreement between AMR Investment
                           Services, Inc. and Barrow, Hanley, Mewhinney &
                           Strause, Inc. dated November 1, 1995 - (iv)

           (ii)(D)         Investment Advisory Agreement between AMR Investment
                           Services, Inc. and Brandywine Asset Management, Inc.
                           dated January 16, 1998 - (v)

           (ii)(E)         Investment Advisory Agreement between AMR Investment
                           Services, Inc. and Hotchkis and Wiley, a division of
                           the Capital Management Group of Merrill Lynch Asset
                           Management, L.P. dated November 12, 1996 - (ii)

           (ii)(F)         Form of Investment Advisory Agreement between AMR
                           Investment Services, Inc. and Lazard Asset
                           Management*

           (ii)(G)         Amendment to Schedule A of Advisory Agreement between
                           AMR Investment Services, Inc. and Brandywine Asset
                           Management, Inc. dated October 15, 1998 - (vi)

<PAGE>   210


           (ii)(H)         Amendment to Schedule A to of Advisory Agreement
                           between AMR Investment Services, Inc. and Hotchkis
                           and Wiley, a division of the Capital Management Group
                           of Merrill Lynch Asset Management, L.P. dated October
                           15, 1998 - (vi)

           (ii)(I)         Form of Amendment to Schedule A of Advisory Agreement
                           between AMR Investment Services, Inc. and
                           Independence Investment Associates, Inc.*

          (iii)(A)         Administrative Services Agreement between the
                           American AAdvantage Funds and AMR Investment
                           Services, Inc. dated November 21, 1997 - (iv)

          (iii)(B)         Supplement to Administrative Services Agreement dated
                           September 1, 1998 - (vi)

          (iii)(C)         Supplement to Administrative Services Agreement dated
                           January 1, 1999*

          (iii)(D)         Supplement to Administrative Services Agreement dated
                           March 1, 2000 - filed herewith

           (iv)            Administrative Services Plan for the Platinum Class -
                           (iv)

           (v)             Master Feeder Participation Agreement among American
                           AAdvantage Funds, American AAdvantage Mileage Funds
                           and State Street Equity 500 Index Portfolio and State
                           Street Bank and Trust Company dated March 1, 2000 -
                           filed herewith

         (e)               Distribution Agreement among the American AAdvantage
                           Funds, the American AAdvantage Mileage Funds, the
                           American Select Funds and SWS Financial Services,
                           Inc. dated December 31, 1999 - filed herewith

         (f)               Bonus, profit sharing or pension plans - none

         (g)               Custodian Agreement between the American AAdvantage
                           Funds and State Street Bank and Trust Company dated
                           December 1, 1997 - (v)

         (h)(i)            Transfer Agency and Service Agreement between the
                           American AAdvantage Funds-and State Street Bank and
                           Trust Company dated January 1, 1998 - (v)

            (ii)           Securities Lending Authorization Agreement between
                           American AAdvantage Funds and State Street Bank and
                           Trust Company dated January 2, 1998 - (v)

            (iii)          Service Plan Agreement for the American AAdvantage
                           Funds PlanAhead Class dated August 1, 1994 - (iv)

            (iv)           Credit Agreement between American AAdvantage Funds
                           and AMR Investment Services, Inc., dated December 1,
                           1999*

            (v)            Administrative Services Agreement among American
                           AAdvantage Funds, American AAdvantage Mileage Funds,
                           AMR Investment Services Trust, AMR Investment
                           Services, Inc. and State Street Bank and Trust
                           Company dated November 29, 1999*

         (i)               Opinion and consent of counsel - filed herewith

         (j)               Consent of Independent Auditors - filed herewith

         (k)               Financial statements omitted from prospectus - none

<PAGE>   211

         (l)               Letter of investment intent - (iv)

         (m)(i)            Plan pursuant to Rule 12b-1 for the Institutional,
                           PlanAhead and AMR Classes - (iv)

            (ii)           Plan pursuant to Rule 12b-1 for the Platinum Class -
                           (iv)

         (n)               Amended and Restated Plan pursuant to Rule 18f-3 -
                           (iv)

                           Other Exhibits -  Powers of Attorney for all Trustees
                           - (ii)

                           Powers of Attorney for Trustees of the State Street
                           Equity 500 Index Portfolio - filed herewith

                           Power of Attorney for the President of the State
                           Street Equity 500 Index Portfolio - filed herewith


- -------------------------

+        Incorporated by reference to PEA No. 4 to the Registration Statement of
         the Trust on Form N-1A as filed with the SEC on December 31, 1990.


(i)      Incorporated by reference to PEA No. 15 to the Registration Statement
         of the Trust on Form N-1A as filed with the SEC on December 22, 1995.


(ii)     Incorporated by reference to PEA No. 19 to the Registration Statement
         of the Trust on Form N-1A as filed with the SEC on February 13, 1997.


(iii)    Incorporated by reference to PEA No. 20 to the Registration Statement
         of the Trust on Form N-1A as filed with the SEC on July 1, 1997.


(iv)     Incorporated by reference to PEA No. 23 to the Registration Statement
         of the Trust on Form N-1A as filed with the SEC on December 18, 1997.

(v)      Incorporated by reference to PEA No. 24 to the Registration Statement
         of the Trust on Form N-1A as filed with the SEC on February 27, 1998.

(vi)     Incorporated by reference to PEA No. 25 to the Registration Statement
         of the Trust on Form N-1A as filed with the SEC on October 15, 1998.

*        Incorporated by reference to PEA No. 28 to the Registration Statement
         of the Trust on Form N-1A as filed with the SEC on December 21, 1999.



Item 24. Persons Controlled by or under Common Control with Registrant

         None.

Item 25. Indemnification

         Article XI, Section 2 of the Declaration of Trust of the Trust provides
         that:

<PAGE>   212

         (a) Subject to the exceptions and limitations contained in paragraph
(b) below:

                  (i) every person who is, or has been, a Trustee or officer of
the Trust (hereinafter referred to as "Covered Person") shall be indemnified by
the appropriate portfolios to the fullest extent permitted by law against
liability and against all expenses reasonably incurred or paid by him in
connection with any claim, action, suit or proceeding in which he becomes
involved as a party or otherwise by virtue of his being or having been a Trustee
or officer and against amounts paid or incurred by him in the settlement
thereof;

                  (ii) the words "claim," "action," "suit," or "proceeding"
shall apply to all claims, actions, suits or proceedings (civil, criminal or
other, including appeals), actual or threatened while in office or thereafter,
and the words "liability" and "expenses" shall include, without limitation,
attorneys' fees, costs, judgments, amounts paid in settlement, fines, penalties
and other liabilities.

         (b) No indemnification shall be provided hereunder to a Covered Person:

                  (i) who shall have been adjudicated by a court or body before
which the proceeding was brought (A) to be liable to the Trust or its
Shareholders by reason of willful misfeasance, bad faith, gross negligence or
reckless disregard of the duties involved in the conduct of his office or (B)
not to have acted in good faith in the reasonable belief that his action was in
the best interest of the Trust; or

                  (ii) in the event of a settlement, unless there has been a
determination that such Trustee or officer did not engage in willful
misfeasance, bad faith, gross negligence or reckless disregard of the duties
involved in the conduct of his office (A) by the court or other body approving
the settlement; (B) by at least a majority of those Trustees who are neither
interested persons of the Trust nor are parties to the matter based upon a
review of readily available facts (as opposed to a full trial-type inquiry); or
(C) by written opinion of independent legal counsel based upon a review of
readily available facts (as opposed to a full trial-type inquiry); provided,
however, that any Shareholder may, by appropriate legal proceedings, challenge
any such determination by the Trustees, or by independent counsel.

         (c) The rights of indemnification herein provided may be insured
against by policies maintained by the Trust, shall be severable, shall not be
exclusive of or affect any other rights to which any Covered Person may now or
hereafter be entitled, shall continue as to a person who has ceased to be such
Trustee or officer and shall inure to the benefit of the heirs, executors and
administrators of such a person. Nothing contained herein shall affect any
rights to indemnification to which Trust personnel, other than Trustees and
officers, and other persons may be entitled by contract or otherwise under law.

         (d) Expenses in connection with the preparation and presentation of a
defense to any claim, action, suit, or proceeding of the character described in
paragraph (a) of this Section 2 may be paid by the applicable Portfolio from
time to time prior to final disposition thereof upon receipt of an undertaking
by or on behalf of such Covered Person that such amount will be paid over by him
to the Trust if it is ultimately determined that he is not entitled to
indemnification under this Section 2; provided, however, that:


<PAGE>   213

                  (i) such Covered Person shall have provided appropriate
security for such undertaking;

                  (ii) the Trust is insured against losses arising out of any
such advance payments; or

                  (iii) either a majority of the Trustees who are neither
interested persons of the Trust nor parties to the matter, or independent legal
counsel in a written opinion, shall have determined, based upon a review of
readily available facts (as opposed to a trial-type inquiry or full
investigation), that there is reason to believe that such Covered Person will be
found entitled to indemnification under this Section 2.

         According to Article XII, Section 1 of the Declaration of Trust, the
Trust is a trust, not a partnership. Trustees are not liable personally to any
person extending credit to, contracting with or having any claim against the
Trust, a particular Portfolio or the Trustees. A Trustee, however, is not
protected from liability due to willful misfeasance, bad faith, gross negligence
or reckless disregard of the duties involved in the conduct of his office.

         Article XII, Section 2 provides that, subject to the provisions of
Section 1 of Article XII and to Article XI, the Trustees are not liable for
errors of judgment or mistakes of fact or law, or for any act or omission in
accordance with advice of counsel or other experts or for failing to follow such
advice.

Item 26. I. Business and Other Connections of Investment Manager

         AMR Investment Services, Inc. (the "Manager"), 4333 Amon Carter
Boulevard, MD 5645, Fort Worth, Texas 76155, offers investment management and
administrative services. Information as to the officers and directors of the
Manager is included in its current Form ADV filed with the SEC and is
incorporated by reference herein.

         II. Business and Other Connections of Investment Advisers

         The investment advisers listed below provide investment advisory
services to the Trust.

         Barrow, Hanley, Mewhinney & Strauss, 3232 McKinney Avenue, 15th Floor,
Dallas, Texas 75204.

         Brandywine Asset Management, Inc., 201 North Walnut Street, Wilmington,
Delaware 19801.

         Hotchkis and Wiley, 725 South Figueroa Street, Suite 4000, Los Angeles,
California 90017.

         Independence Investment Associates, Inc., 53 State Street, Boston,
Massachusetts 02109.

         Lazard Asset Management, 30 Rockefeller Plaza, New York, New York
10112.

         Templeton Investment Counsel, Inc. 500 East Broward Blvd., Ft.
Lauderdale, Florida 33394.

<PAGE>   214

         Information as to the officers and directors of each of the above
investment advisers is included in that adviser's current Form ADV filed with
the SEC and is incorporated by reference herein.

Item 27. Principal Underwriter

                  (a) SWS Financial Services, Inc., 7001 Preston Road, Dallas,
TX 75205 is the principal underwriter for the Trust.

                  (b) The directors and officers of the Trust's principal
underwriter are:

<TABLE>
<CAPTION>
                                       Positions & Offices                                  Position
Name                                    with Underwriter                                    with Registrant
- ----                                    ----------------                                    ---------------
<S>                                   <C>                                                 <C>
Sue H. Peden                           Chief Executive Officer                              None

Raymond E. Wooldridge                  Chairman                                             None

Dianna Boswell                         President                                            None

Diana Burrell                          Vice President                                       None

Diane Scott                            Assistant Vice President                             None
</TABLE>


         The address of the above named directors and officers is 7001 Preston
Road, Dallas, TX 75205.

Item 28. Location of Accounts and Records

         The books and other documents required by Rule 31a-1 under the
Investment Company Act of 1940 are maintained as follows:

31a-1(b)(1) - in the physical possession of the Trust's custodian;
31a-1(b)(2)(i),(ii)&(iii) - in the physical possession of the Trust's custodian
31a-1(b)(2)(iv) - in the physical possession of the Trust's transfer agent
31a-1(b)(4) - in the physical possession of the Trust's Manager
31a-1(b)(5) - in the physical possession of the Trust's investment advisers
31a-1(b)(6) - A record of other purchases or sales etc. - in the physical
   possession of the Trust's Manager, investment advisers and custodian
31a-1(b)(7) - in the physical possession of the Trust's custodian
31a-1(b)(8) - in the physical possession of the Trust's custodian
31a-1(b)(9) - in the physical possession of the Trust's investment advisers
31a-1(b)(10) - in the physical possession of the Trust's Manager
31a-1(b)(11) - in the physical possession of the Trust's Manager
31a-1(b)(12) - in the physical possession of the Trust's Manager, investment
   advisers and custodian


<PAGE>   215
Item 29. Management Services

                  All substantive provisions of any management-related service
contract are discussed in Part A or Part B.

Item 30. Undertakings

         Registrant hereby undertakes to furnish each person to whom a
prospectus is delivered with a copy of its latest annual report to shareholders,
upon request and without charge.

         Registrant hereby undertakes to carry out all indemnification
provisions of its Declaration of Trust in accordance with Investment Company Act
Release No. 11330 (September 4, 1980) and successor releases.

         Insofar as indemnification for liability arising under the Securities
Act of 1933, as amended ("1933 Act"), may be permitted to trustees, officers and
controlling persons of the Registrant pursuant to the provisions under Item 25
herein, or otherwise, the Registrant has been advised that in the opinion of the
SEC such indemnification is against public policy as expressed in the 1933 Act
and is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the Registrant of expenses
incurred or paid by a trustee, officer or controlling person of the Registrant
in the successful defense of any action, suit or proceeding) is asserted by such
trustee, officer or controlling person in connection with the securities being
registered, the Registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the 1933 Act and will be governed by the final
adjudication.


<PAGE>   216


                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, as amended,
and the Investment Company Act of 1940, as amended, the Registrant certifies
that it meets all of the requirements for effectiveness of this amendment to its
Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933
and has duly caused this Post-Effective Amendment No. 29 to its Registration
Statement on Form N-1A to be signed on its behalf by the undersigned, thereunto
duly authorized, in the City of Fort Worth and the State of Texas, on February
29, 2000. No other material event requiring prospectus disclosure has occurred
since the latest of the three dates specified in Rule 485(b)(2).

                                            AMERICAN AADVANTAGE FUNDS

                                            By: /s/ William F. Quinn
                                               ----------------------------
                                                     William F. Quinn
                                                     President
Attest:


/s/ Barry Y. Greenberg
- ----------------------------------
Barry Y. Greenberg
Vice President and Assistant Secretary

         Pursuant to the requirements of the Securities Act of 1933, as amended,
this Post-Effective Amendment No. 29 to the Registration Statement has been
signed below by the following persons in the capacities and on the dates
indicated.


<TABLE>
<CAPTION>
Signature                                       Title                        Date
- ---------                                       -----                        ----
<S>                                         <C>                       <C>

/s/ William F. Quinn                        President and              February 29, 2000
- ----------------------------------          Trustee
William F. Quinn


Alan D. Feld*                               Trustee                    February 29, 2000
- ----------------------------------
Alan D. Feld


Ben J. Fortson*                             Trustee                    February 29, 2000
- ----------------------------------
Ben J. Fortson


John S. Justin*                             Trustee                    February 29, 2000
- ----------------------------------
John S. Justin


Stephen D. O'Sullivan*                      Trustee                    February 29, 2000
- ----------------------------------
Stephen D. O'Sullivan


Roger T. Staubach*                          Trustee                    February 29, 2000
- ----------------------------------
Roger T. Staubach


Dr. Kneeland Youngblood *                   Trustee                    February 29, 2000
- ----------------------------------
Dr. Kneeland Youngblood


*By  /s/ William F. Quinn
    ---------------------------------------
     William F. Quinn, Attorney-In-Fact
</TABLE>


<PAGE>   217


                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, as amended,
and the Investment Company Act of 1940, as amended, AMR Investment Services
Trust certifies that it meets all of the requirements for effectiveness of this
amendment to the Registration Statement as it relates to AMR Investment Services
Trust pursuant to Rule 485(b) under the Securities Act of 1933 and has duly
caused this Post-Effective Amendment No. 29 to the Registration Statement on
Form N-1A as it relates to AMR Investment Services Trust to be signed on its
behalf by the undersigned, thereunto duly authorized, in the City of Fort Worth
and the State of Texas, on February 29, 2000. No other material event requiring
prospectus disclosure has occurred since the latest of the three dates specified
in Rule 485(b)(2).


                                            AMR INVESTMENT SERVICES TRUST

                                            By: /s/ William F. Quinn
                                               ----------------------------
                                                     William F. Quinn
                                                     President
Attest:


/s/ Barry Y. Greenberg
- ----------------------------------
Barry Y. Greenberg
Vice President and Assistant Secretary


         Pursuant to the requirements of the Securities Act of 1933, as amended,
this Post-Effective Amendment No. 29 to the Registration Statement for the
American AAdvantage Funds as it relates to the AMR Investment Services Trust has
been signed below by the following persons in the capacities and on the dates
indicated.



<TABLE>
<CAPTION>
Signature                                       Title                        Date
- ---------                                       -----                        ----
<S>                                         <C>                       <C>

/s/ William F. Quinn                        President and              February 29, 2000
- ----------------------------------          Trustee
William F. Quinn


Alan D. Feld*                               Trustee                    February 29, 2000
- ----------------------------------
Alan D. Feld


Ben J. Fortson*                             Trustee                    February 29, 2000
- ----------------------------------
Ben J. Fortson


John S. Justin*                             Trustee                    February 29, 2000
- ----------------------------------
John S. Justin


Stephen D. O'Sullivan*                      Trustee                    February 29, 2000
- ----------------------------------
Stephen D. O'Sullivan


Roger T. Staubach*                          Trustee                    February 29, 2000
- ----------------------------------
Roger T. Staubach


Dr. Kneeland Youngblood *                   Trustee                    February 29, 2000
- ----------------------------------
Dr. Kneeland Youngblood


*By  /s/ William F. Quinn
    ---------------------------------------
     William F. Quinn, Attorney-In-Fact
</TABLE>


<PAGE>   218



                                   SIGNATURES

         State Street Equity 500 Index Portfolio has duly caused this
Post-Effective Amendment No. 29 to the Registration Statement on Form N-1A of
American AAdvantage Funds, as it relates to the American AAdvantage S&P 500
Index Fund, to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Boston and the Commonwealth of Massachusetts on
February 29, 2000.

                                         STATE STREET EQUITY 500 INDEX PORTFOLIO


                                         By: /s/ James B. Little
                                            -----------------------------------
                                             James B. Little
                                             President and Treasurer

         This Post-Effective Amendment No. 29 to the Registration Statement on
Form N-1A of American AAdvantage Funds, as it relates to the American AAdvantage
S&P 500 Index Fund, has been signed below by the following persons, in the
capacities indicated, with respect to State Street Equity 500 Index Portfolio on
February 29, 2000.

<TABLE>
<CAPTION>
SIGNATURE                                    TITLE
<S>                                          <C>

William L. Boyan*                            Trustee
- ---------------------------
William L. Boyan


Michael F. Holland*                          Trustee
- ---------------------------
Michael F. Holland


Rina K. Spence*                              Trustee
- ---------------------------
Rina K. Spence


Douglas T. Williams*                         Trustee
- ---------------------------
Douglas T. Williams


/s/ James B. Little                          President and Treasurer
- ---------------------------
James B. Little
</TABLE>



*By: /s/ Julie A. Tedesco  ,
     ----------------------
as Attorney-in-Fact pursuant to a Power of Attorney


<PAGE>   219



POWER OF ATTORNEY

Each of the undersigned Trustees of State Street Master Funds (the "Trust")
hereby constitutes and appoints Julie Tedesco, Esq., and Jennifer Fromm, Esq.,
each of them with full powers of substitution, as his or her true and lawful
attorney-in-fact and agent to execute in his or her name and on his or her
behalf in any and all capacities the Registration Statements on Form N-1A, and
any and all amendments thereto, and all other documents, filed by any fund that
has substantially all of its investable assets invested in a Portfolio of the
Trust with the Securities and Exchange Commission (the "SEC"') under the
Investment Company Act of 1940, as amended, and (as applicable) the Securities
Act of 1933, as amended, and any and all instruments which such attorneys and
agents, or any of them, deem necessary or advisable to enable the Trust to
comply with such Acts, the rules, regulations and requirements of the SEC, and
the securities or Blue Sky laws of any state or other jurisdiction, and to file
the same, with all exhibits thereto and other documents in connection therewith,
with the SEC and such other jurisdictions, and each of the undersigned hereby
ratifies and confirms as his or her own act and deed any and all acts that such
attorneys and agents, or any of them, shall do or cause to be done by virtue
hereof. Any one of such attorneys and agents has, and may exercise, all of the
powers hereby conferred. Each of the undersigned hereby revokes any Powers of
Attorney previously granted with respect to the Trust concerning the filings and
actions described herein.

IN WITNESS WHEREOF, the undersigned have hereunto set their hands as of the 28th
day of February, 2000.


<TABLE>
<CAPTION>
SIGNATURE                          TITLE
<S>                                <C>

/s/ William Boyan                  Trustee
- ---------------------------
William Boyan

/s/ Michael Holland                Trustee
- ---------------------------
Michael Holland

/s/ Douglas Williams               Trustee
- ---------------------------
Douglas Williams

/s/ Rina Spence                    Trustee
- ---------------------------
Rina K. Spence
</TABLE>



<PAGE>   220



POWER OF ATTORNEY

The undersigned officer of State Street Master Funds (the "Trust") hereby
constitutes and appoints Julie Tedesco, Esq., and Jennifer Fromm, Esq., each of
them with full powers of substitution, as his true and lawful attorney-in-fact
and agent to execute in his name and on his behalf in any and all capacities the
Registration Statements on Form N-1A, and any and all amendments thereto, and
all other documents, filed by any fund that has substantially all of its
investable assets invested in a Portfolio of the Trust with the Securities and
Exchange Commission (the "SEC"') under the Investment Company Act of 1940, as
amended, and (as applicable) the Securities Act of 1933, as amended, and any and
all instruments which such attorneys and agents, or any of them, deem necessary
or advisable to enable the Trust to comply with such Acts, the rules,
regulations and requirements of the SEC, and the securities or Blue Sky laws of
any state or other jurisdiction, and to file the same, with all exhibits thereto
and other documents in connection therewith, with the SEC and such other
jurisdictions, and the undersigned hereby ratifies and confirms as his own act
and deed any and all acts that such attorneys and agents, or any of them, shall
do or cause to be done by virtue hereof. Any one of such attorneys and agents
has, and may exercise, all of the powers hereby conferred. The undersigned
hereby revokes any Powers of Attorney previously granted with respect to the
Trust concerning the filings and actions described herein.

IN WITNESS WHEREOF, the undersigned has hereunto set his hand as of the 28th day
of February, 2000.



SIGNATURE                           TITLE


/s/ James B. Little                 President and Treasurer
- ---------------------------
James B. Little




<PAGE>   221


                               INDEX TO EXHIBITS


<TABLE>
<CAPTION>
        Exhibit
        Number             Description                                  Page
        ------             -----------                                  ----
<S>                      <C>                                            <C>
         (a)               Declaration of Trust - (iv)

         (b)               Bylaws - (iv)

         (c)               Voting trust agreement -- none

         (d)(i)(A)         Fund Management Agreement between American AAdvantage
                           Funds and AMR Investment Services, Inc. dated
                           April 3, 1987+

            (i)(B)         Supplement to Fund Management Agreement dated
                           August 1, 1994 - (iv)

            (i)(C)         Supplement to Fund Management Agreement dated
                           August 1, 1995 - (iv)

            (i)(D)         Supplement to Fund Management Agreement dated
                           November 1, 1995*

            (i)(E)         Amendment to Schedule A of Fund Management Agreement
                           dated December 1, 1995 - (i)

            (i)(F)         Supplement to Fund Management Agreement dated
                           December 17, 1996 - (ii)

            (i)(G)         Supplement to Fund Management Agreement dated
                           July 25, 1997 - (iii)

            (i)(H)         Supplement to Fund Management Agreement dated
                           September 1, 1998 - (vi)

            (i)(I)         Supplement to Fund Management Agreement dated
                           January 1, 1999*

           (ii)(A)         Investment Advisory Agreement between AMR Investment
                           Services, Inc. and Independence Investment
                           Associates, Inc. dated November 1, 1995 - (iv)

           (ii)(B)         Investment Advisory Agreement between AMR Investment
                           Services, Inc. and Templeton Investment Counsel, Inc.
                           dated November 1, 1995 - (iv)

           (ii)(C)         Investment Advisory Agreement between AMR Investment
                           Services, Inc. and Barrow, Hanley, Mewhinney &
                           Strause, Inc. dated November 1, 1995 - (iv)

           (ii)(D)         Investment Advisory Agreement between AMR Investment
                           Services, Inc. and Brandywine Asset Management, Inc.
                           dated January 16, 1998 - (v)

           (ii)(E)         Investment Advisory Agreement between AMR Investment
                           Services, Inc. and Hotchkis and Wiley, a division of
                           the Capital Management Group of Merrill Lynch Asset
                           Management, L.P. dated November 12, 1996 - (ii)

           (ii)(F)         Form of Investment Advisory Agreement between AMR
                           Investment Services, Inc. and Lazard Asset
                           Management*

           (ii)(G)         Amendment to Schedule A of Advisory Agreement between
                           AMR Investment Services, Inc. and Brandywine Asset
                           Management, Inc. dated October 15, 1998 - (vi)

           (ii)(H)         Amendment to Schedule A to of Advisory Agreement
                           between AMR Investment Services, Inc. and Hotchkis
                           and Wiley, a division of the Capital Management Group
                           of Merrill Lynch Asset Management, L.P. dated October
                           15, 1998 - (vi)
</TABLE>


<PAGE>   222

<TABLE>
<S>                      <C>
           (ii)(I)         Form of Amendment to Schedule A of Advisory Agreement
                           between AMR Investment Services, Inc. and
                           Independence Investment Associates, Inc.*

          (iii)(A)         Administrative Services Agreement between the
                           American AAdvantage Funds and AMR Investment
                           Services, Inc. dated November 21, 1997 - (iv)

          (iii)(B)         Supplement to Administrative Services Agreement dated
                           September 1, 1998 - (vi)

          (iii)(C)         Supplement to Administrative Services Agreement dated
                           January 1, 1999*

          (iii)(D)         Supplement to Administrative Services Agreement dated
                           March 1, 2000-filed herewith

           (iv)            Administrative Services Plan for the Platinum Class -
                           (iv)

           (v)             Master Feeder Participation Agreement among American
                           AAdvantage Funds, American AAdvantage Mileage Funds
                           and State Street Equity 500 Index Portfolio and State
                           Street Bank and Trust Company dated March 1, 2000 -
                           filed herewith

         (e)               Distribution Agreement among the American AAdvantage
                           Funds, the American AAdvantage Mileage Funds, the
                           American Select Funds and SWS Financial Services,
                           Inc. dated December 31, 1999 - filed herewith

         (f)               Bonus, profit sharing or pension plans - none

         (g)               Custodian Agreement between the American AAdvantage
                           Funds and State Street Bank and Trust Company dated
                           December 1, 1997 - (v)

         (h)(i)            Transfer Agency and Service Agreement between the
                           American AAdvantage Funds-and State Street Bank and
                           Trust Company dated January 1, 1998 - (v)

            (ii)           Securities Lending Authorization Agreement between
                           American AAdvantage Funds and State Street Bank and
                           Trust Company dated January 2, 1998 - (v)

            (iii)          Service Plan Agreement for the American AAdvantage
                           Funds PlanAhead Class dated August 1, 1994 - (iv)

            (iv)           Credit Agreement between American AAdvantage Funds
                           and AMR Investment Services, Inc., dated December 1,
                           1999*

            (v)            Administrative Services Agreement among American
                           AAdvantage Funds, American AAdvantage Mileage Funds,
                           AMR Investment Services Trust, AMR Investment
                           Services, Inc. and State Street Bank and Trust
                           Company dated November 29, 1999*

         (i)               Opinion and consent of counsel - filed herewith

         (j)               Consent of Independent Auditors - filed herewith

         (k)               Financial statements omitted from prospectus - none

         (l)               Letter of investment intent - (iv)

         (m)(i)            Plan pursuant to Rule 12b-1 for the Institutional,
                           PlanAhead and AMR Classes - (iv)

            (ii)           Plan pursuant to Rule 12b-1 for the Platinum Class -
                           (iv)

         (n)               Amended and Restated Plan pursuant to Rule 18f-3 -
                           (iv)

                           Other Exhibits -  Powers of Attorney for all Trustees
                           - (ii)
</TABLE>




<PAGE>   223


<TABLE>
<S>                      <C>
                           Powers of Attorney for Trustees of the State Street
                           Equity 500 Index Portfolio - filed herewith

                           Power of Attorney for the President of the State
                           Street Equity 500 Index Portfolio - filed herewith
</TABLE>



- -------------------------

+        Incorporated by reference to PEA No. 4 to the Registration Statement of
         the Trust on Form N-1A as filed with the SEC on December 31, 1990.


(i)      Incorporated by reference to PEA No. 15 to the Registration Statement
         of the Trust on Form N-1A as filed with the SEC on December 22, 1995.


(ii)     Incorporated by reference to PEA No. 19 to the Registration Statement
         of the Trust on Form N-1A as filed with the SEC on February 13, 1997.


(iii)    Incorporated by reference to PEA No. 20 to the Registration Statement
         of the Trust on Form N-1A as filed with the SEC on July 1, 1997.


(iv)     Incorporated by reference to PEA No. 23 to the Registration Statement
         of the Trust on Form N-1A as filed with the SEC on December 18, 1997.

(v)      Incorporated by reference to PEA No. 24 to the Registration Statement
         of the Trust on Form N-1A as filed with the SEC on February 27, 1998.

(vi)     Incorporated by reference to PEA No. 25 to the Registration Statement
         of the Trust on Form N-1A as filed with the SEC on October 15, 1998.

*        Incorporated by reference to PEA No. 28 to the Registration Statement
         of the Trust on Form N-1A as filed with the SEC on December 21, 1999.



<PAGE>   1


                      SUPPLEMENTAL TERMS AND CONDITIONS TO
                THE ADMINISTRATIVE SERVICES AGREEMENT BETWEEN THE
                            AMERICAN AADVANTAGE FUNDS
                                       AND
                          AMR INVESTMENT SERVICES, INC.


         The following terms and conditions hereby are incorporated into the
Administrative Services Agreement ("Agreement") dated November 1, 1995 as
supplemented November 21, 1997, September 1, 1998, and January 1, 1999, between
the American AAdvantage Funds ("Trust") and AMR Investment Services, Inc.
("Manager"). To the extent that there is any conflict between the terms and
conditions of the Agreement and these Supplemental Terms and Conditions
("Supplement"), this Supplement shall govern.

         1. Paragraph 3 of the Agreement is hereby amended to read, in its
entirety, as follows:

         3. Fees for Administrative Services. As compensation for its
         administrative services pursuant to Section 2 of this Agreement, the
         Trust shall pay AMR an annualized fee equal as follows:

         a. If a Fund manages its assets directly or invests all of its
         investable assets (i.e., securities and cash) in another registered
         investment company where AMR does not act as Manager and Administrator,
         the Trust shall pay AMR an annualized fee equal to: (1) 0.05% of the
         net assets of the AMR Class of the Balanced Fund, the Large Cap Value
         Fund, the International Equity Fund, the Intermediate Bond Fund, the
         Short-Term Bond Fund and the Small Cap Value Fund, 0.05% of the net
         assets of the Institutional Class of the S&P 500 Index Fund, and 0.30%
         of the net assets of all other classes of the Balanced Fund, the Large
         Cap Value Fund, the International Equity Fund, the Intermediate Bond
         Fund, the Short-Term Bond Fund, the Small Cap Value Fund and the S&P
         500 Index Fund; (2) 0.10% of the net assets of the Money Market Fund,
         the Municipal Money Market Fund and the U.S. Government Money Market
         Fund; and (3) such percentage of any other class or Fund encompassed by
         this Agreement as specified by one or more schedules attached hereto.

         b. If a Fund invests all of its investable assets (i.e., securities and
         cash) in another registered investment company for which AMR acts as
         Manager and Administrator, the Trust shall pay AMR an annualized fee
         equal to: (1) 0.00% of the net assets of the AMR Class, 0.05% of the
         net assets of the Institutional Class of the S&P 500 Index Fund, and
         0.25% of the net assets of all other classes of the Balanced Fund, the
         Large Cap Value Fund, the International Equity Fund, the Intermediate
         Bond Fund, the Short-Term Bond Fund, the Small Cap Value Fund and the
         S&P 500 Index Fund; (2) 0.10% of the net assets of the Money Market
         Fund, the Municipal Money Market Fund and the U.S. Government Money

<PAGE>   2

         Market Fund; and (3) such percentage of any other class or Fund
         encompassed by this Agreement as specified by one or more schedules
         attached hereto.

         The above-described compensation shall be calculated and accrued daily
and be payable quarterly. The Trust acknowledges that none of the compensation
paid pursuant to this Agreement is compensation for portfolio allocation or
investment advisory functions performed by AMR pursuant to its separate
Management Agreement with the Trust; rather, AMR is compensated for those
services pursuant to a separate Management Agreement between the Trust and AMR.

         2. Notice is hereby given that the Agreement and this Supplement are
executed on behalf of the Trustees of the Trust and not individually and that
the obligations of the Agreement and the Supplement are not binding upon any of
the Trustees, officers, or shareholders of the Trust, but are binding only upon
the assets and property of the Fund to which the Agreement and this Supplement
relate.


Dated:
      -----------------------

                                     AMERICAN AADVANTAGE FUNDS


                                     By:
                                        ----------------------------------------
                                          Barry Y. Greenberg
                                          Vice President and Assistant Secretary


                                     AMR INVESTMENT SERVICES, INC.


                                     By:
                                        ----------------------------------------
                                          William F. Quinn
                                          President







<PAGE>   1
                      MASTER FEEDER PARTICIPATION AGREEMENT

                                      AMONG

                           AMERICAN AADVANTAGE FUNDS,
                       AMERICAN AADVANTAGE MILEAGE FUNDS,

                                       AND

                     STATE STREET EQUITY 500 INDEX PORTFOLIO

                                       AND

                       STATE STREET BANK AND TRUST COMPANY

                                   DATED AS OF

                                  MARCH 1, 2000



                                    AGREEMENT

         THIS AGREEMENT is made and entered into as of the 1st day of March,
2000, by and among American AAdvantage Funds and American AAdvantage Mileage
Funds, each organized as a Massachusetts business trust (each a "Trust" or,
collectively, the "Trusts"), on behalf of the American AAdvantage S&P 500 Index
Fund and the American AAdvantage S&P 500 Index Mileage Fund, respectively, (each
a "Fund" or, collectively, the "Funds"), State Street Equity 500 Index
Portfolio, a series of the State Street Master Funds, a trust organized under
the common law of the Commonwealth of Massachusetts (the "Portfolio"), and State
Street Bank and Trust Company, a Massachusetts bank holding company (the
"Adviser"), with respect to the proposed investment by the Funds in the
Portfolio.

                                   WITNESSETH

         WHEREAS, the Funds and the Portfolio are each open-end management
investment companies and the Funds and the Portfolio have the same investment
objectives and substantively the same investment policies;

         WHEREAS, the Adviser currently serves as the investment adviser of the
Portfolio;

         WHEREAS, the Funds desire to invest all of their investable assets in
the Portfolio in exchange for a beneficial interest in the Portfolio (the
"Investment") on the terms and conditions set forth in this Agreement;


                                      -1-
<PAGE>   2

         WHEREAS, the Portfolio believes that accepting the Investment is in the
best interests of the Portfolio and that the interests of existing investors in
the Portfolio will not be diluted as a result of its accepting the Investment;
and

         NOW, THEREFORE, in consideration of the foregoing, the mutual promises
herein made and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties agree as follows:

                                        I
                                 THE INVESTMENT

         1.1 Account. The Funds will invest all of their investable assets in
the Portfolio and, in exchange therefor, the Portfolio agrees to issue to each
Fund a beneficial interest in the Portfolio equal in value to the net value of
the assets of the Fund conveyed to the Portfolio (an "Account"). Each Fund may
add to or reduce its investment in the Portfolio in the manner described in the
Portfolio's registration statement on Form N-1A (the "Portfolio's N-1A"). Each
Fund's aggregate interest in the Portfolio would then be recomputed in
accordance with the method described in the Portfolio's N-1A.

         1.2 Application. In connection with its initial investment in the
Portfolio, each Fund will execute and deliver to the Portfolio an application
substantially in the form of Appendix A hereto.

         1.3 Investment Date. The Investment, as described in Article I,
together with related acts necessary to consummate such transactions, shall
occur initially on March 1, 2000 and at each subsequent date as the Funds desire
to make a further Investment in the Portfolio. All acts occurring on the date of
Investment shall be deemed to occur simultaneously as of the last daily
determination of the Portfolio's net asset value on the date of the Investment.

         1.4 Related Matters. On each date of Investment, the Fund shall
authorize the Fund's custodian to deliver all of the assets held by such
custodian to the Portfolio's custodian. The Portfolio's custodian shall
acknowledge their respective acceptance of the assets. The Portfolio shall
deliver to the Fund acceptable evidence of the Fund's ownership of the Account.
In addition, each party shall deliver to each other party such bills of sale,
checks, assignments, securities instruments, receipts or other documents as such
other party or its counsel may reasonably request.

                                       II
                         REPRESENTATIONS AND WARRANTIES

         2.1 The Trusts. Each Trust represents and warrants to the Portfolio:

                  (a) Organization. Each Trust is duly organized and validly
existing under the laws of the Commonwealth of Massachusetts as a Massachusetts
business trust. The Funds are duly and validly designated series of the Trusts
and have the requisite power and authority to


                                      -2-
<PAGE>   3

own their property and conduct their business as now being conducted and as
proposed to be conducted pursuant to this Agreement.

                  (b) Authorization of Agreement. The execution and delivery of
this Agreement by the Trusts and the consummation of the transactions
contemplated hereby have been duly authorized by all necessary action on the
part of each Trust by its respective Board of Trustees and no other action or
proceeding is necessary for the execution and delivery of this Agreement by each
Trust, the performance by each Trust of its obligations hereunder and the
consummation by each Fund of the transactions contemplated hereby. This
Agreement has been duly executed and delivered by each Trust and constitutes a
legal, valid and binding obligation of each Fund, enforceable against it in
accordance with its terms.

                  (c) No Bankruptcy Proceedings. Neither Fund is under the
jurisdiction of a court in a proceeding under Title 11 of the United States Code
(the "Bankruptcy Code") or similar case within the meaning of Section
368(a)(3)(A) of the Bankruptcy Code.

                  (d) Fiscal Year. The fiscal year end for each Fund is December
31.

                  (e) Auditors. The Trusts have appointed Ernst & Young LLP as
the Funds' independent public accountants to certify each Fund's financial
statements in accordance with Section 32 of the Investment Company Act of 1940,
an amended ("1940 Act").

                  (f) Registration Statement. AMR Investment Services, Inc.,
Adviser and counsel to the Trusts have reviewed the Portfolio's registration
statement on Form N-1A, as filed with the Securities and Exchange Commission
("SEC"), and understands and agrees to the Portfolio's policies and methods of
operation as described therein.

                  (g) Errors and Omissions Insurance Policy. The Trusts have in
force an errors and omissions liability insurance policy insuring the Funds
against loss up to $12.5 million for negligence or wrongful acts.

                  (h) SEC Filings. Each Fund has duly filed all forms, reports,
proxy statements and other documents (collectively, the "SEC Filings") required
to be filed under the Securities Act of 1933, as amended (the "1933 Act"), the
Securities Exchange Act of 1934 (the "1934 Act") and the 1940 Act (collectively,
the "Securities Laws") in connection with the registration of its shares, any
meetings of its shareholders and its registration as an investment company. The
SEC Filings were prepared in accordance with the requirements of the Securities
Laws, as applicable, and the rules and regulations of the Securities and
Exchange Commission (the "SEC") thereunder, and do not contain any untrue
statement of a material fact or omit to state any material fact required to be
stated therein or necessary in order to make the statements therein, in the
light of the circumstances under which they were made, not misleading.

                  (i) 1940 Act Registration. Each Trust is duly registered as an
open-end management investment company under the 1940 Act and each Fund and its
shares are registered or qualified in any states where such registration or
qualification is necessary and such registrations or qualifications are in full
force and effect.


                                      -3-
<PAGE>   4

         2.2 The Portfolio and the Adviser. The Portfolio and the Adviser each
represents and warrants to the Trusts that:

                  (a) Organization. The Portfolio is a series of the State
Street Master Funds, a duly organized and validly existing trust under the laws
of the Commonwealth of Massachusetts and has the requisite power and authority
to own its property and conduct its business as now being conducted and as
proposed to be conducted pursuant to this Agreement.

                  (b) Authorization of Agreement. The execution and delivery of
this Agreement by the Portfolio and the consummation of the transactions
contemplated hereby have been duly authorized by all necessary action on the
part of the Portfolio by its Board of Trustees and no other action or proceeding
is necessary for the execution and delivery of this Agreement by the Portfolio,
the performance by the Portfolio of its obligations hereunder and the
consummation by the Portfolio of the transactions contemplated hereby. This
Agreement has been duly executed and delivered by the Portfolio and constitutes
a legal, valid and binding obligation of the Portfolio, enforceable against it
in accordance with its terms.

                  (c) Authorization of Issuance of Interest. The issuance by the
Portfolio of an Account in exchange for the Investment by each Fund of its
assets has been duly authorized by all necessary action on the part of the Board
of Trustees of the Portfolio. When issued in accordance with the terms of this
Agreement, the Account will be validly issued, fully paid and non-assessable by
the Portfolio.

                  (d) No Bankruptcy Proceedings. The Portfolio is not under the
jurisdiction of a court in a proceeding under Title 11 of the Bankruptcy Code or
similar case within the meaning of Section 368(a)(3)(A) of the Bankruptcy Code.

                  (e) Fiscal Year. The fiscal year end of the Portfolio is
December 31.

                  (f) Auditors. The Portfolio has appointed Ernst & Young LLP as
the Portfolio's independent public accountants to certify the Portfolio's
financial statements in accordance with Section 32 of the 1940 Act.

                  (g) Registration Statement. The Portfolio has reviewed each
Fund's registration statement on Form N-1A, as filed with the SEC, and
understands and agrees to each Fund's policies and methods of operation as
described therein.

                  (h) Errors and Omissions Insurance Policy. The Portfolio has
in force an errors and omissions liability insurance policy insuring the
Portfolio against loss up to $5 million for negligence or wrongful acts.

                  (i) SEC Filings. The Portfolio has duly filed all SEC Filings
required to be filed with the SEC pursuant to the 1934 Act and the 1940 Act in
connection with any meetings of its investors and its registration as an
investment company. Beneficial interests in the Portfolio are not required to be
registered under the 1933 Act because such interests are offered solely in



                                      -4-
<PAGE>   5

private placement transactions that do not involve any "public offering" within
the meaning of Section 4(2) of the 1933 Act. The SEC Filings were prepared in
accordance with the requirements of the Securities Laws, as applicable, and the
rules and regulations of the SEC thereunder, and do not contain any untrue
statement of a material fact or omit to state any material fact required to be
stated therein or necessary in order to make the statements therein, in the
light of the circumstances under which they were made, not misleading.

                  (j) 1940 Act Registration. The Portfolio is duly registered as
an open-end management investment company under the 1940 Act and such
registration is in full force and effect.

                  (k) Tax Status. The Portfolio is taxable as a partnership
under the Internal Revenue Code of 1986, as amended (the "Code").

                  (l) Pricing Procedures. The Portfolio has adopted pricing and
valuation procedures that comply with the 1940 Act.

                  (m) In-Kind Redemption Procedures. The Portfolio has adopted
in-kind redemption procedures that comply with the 1940 Act and any
interpretations related thereto issued by the SEC staff.

         2.3 The Adviser. The Adviser represents and warrants to the Funds that:

                  (a) Organization. The Adviser is a Massachusetts banking
corporation duly organized, validly existing and in good standing under the laws
of the Commonwealth of Massachusetts and has the requisite power and authority
to conduct its business as now being conducted.

                  (b) Authorization of Agreement. The execution and delivery of
this Agreement by the Adviser have been duly authorized by all necessary action
on the part of the Adviser and no other action or proceeding is necessary for
the execution and delivery of this Agreement by the Adviser. This Agreement has
been duly executed and delivered by the Adviser and constitutes a legal, valid
and binding obligation of the Adviser.

                  (c) Advisers Act. The Adviser is currently exempt from the
definition of an investment adviser under the Investment Advisers Act of 1940,
as amended (the "Advisers Act") and will register as an investment adviser under
the Advisers Act on a timely basis as required by applicable registration.

                  (d) Pricing Procedures. The Adviser has adopted pricing and
valuation procedures that comply with the 1940 Act.



                                      -5-
<PAGE>   6
                                       III
                                    COVENANTS

         3.1 The Trusts. Each Trust covenants that:

                  (a) Advance Review of Certain Documents. Each Trust will
furnish the Portfolio and the Adviser, at least three (3) business days prior to
filing or first use, as the case may be, with drafts of amendments to its
registration statement on Form N-lA and prospectus supplements or amendments
relating to the Fund. Each Trust will furnish the Portfolio and the Adviser with
any proposed advertising or sales literature relating to the Fund at least one
(1) business day prior to filing or first use; provided, however, that such
advance notice shall not be required for advertising or sales literature that
merely references the name of the Fund. Each Trust agrees that it will include
in all such Fund documents any disclosures that may be required by law,
particularly those relating to the Adviser's status as a bank, and it will
include in all such Fund documents any material comments reasonably made by the
Adviser or Portfolio. The Portfolio and Adviser will, however, in no way be
liable for any errors or omissions in such documents, whether or not they make
any objection thereto, except to the extent such errors or omissions result from
information provided by the Adviser or the Portfolio.

                  (b) Tax Status. Each Fund will qualify for treatment as a
regulated investment company under Subchapter M of the Code for all periods
during which this Agreement is in effect, except to the extent a failure to so
qualify may result from any action or omission of the Portfolio.

                  (c) Investment Securities. Neither Fund will own any
investment security other than its Account in the Portfolio for all periods
during which this Agreement is in effect as to that Fund.

                  (d) Proxy Voting. If requested to vote on matters pertaining
to the Portfolio, each Fund will (i) call a meeting of shareholders of the Fund
for the purpose of seeking instructions from shareholders regarding such
matters, (ii) vote the Fund's Account proportionally as instructed by Fund
shareholders, and (iii) vote the Fund's Account with respect to the shares held
by Fund shareholders who do not give voting instructions in the same proportion
as the shares of Fund shareholders who do give voting instructions. Each Fund
will hold each such meeting of Fund shareholders in accordance with a timetable
reasonably established by the Portfolio. The Portfolio will be responsible for
all reasonable costs (including legal fees) associated with Fund proxies and
shareholder meetings called for the purpose of voting on matters pertaining to
the Portfolio.

                  (e) Insurance. The Trusts shall at all times maintain errors
and omissions liability insurance with respect to the Funds covering losses for
negligence and wrongful acts in an amount not less than $12.5 million.



                                      -6-
<PAGE>   7

         3.2      Indemnification by Funds.

                  (a) Each Fund will indemnify and hold harmless the Portfolio,
the Adviser and their respective trustees, directors, officers and employees and
each other person who controls the Portfolio or the Adviser, as the case may be,
within the meaning of Section 15 of the 1933 Act (each, a "Covered Person" and
collectively, "Covered Persons"), against any and all losses, claims, demands,
damages, liabilities and expenses (each, a "Liability" and collectively, the
"Liabilities") (including the reasonable cost of investigating and defending
against any claims therefor and any counsel fees incurred in connection
therewith), joint or several, which

                      (i) arise out of or are based upon any of the Securities
Laws, any other statute or common law or are incurred in connection with or as a
result of any formal or informal administrative proceeding or investigation by a
regulatory agency, insofar as such Liabilities arise out of or are based upon
the ground or alleged ground that any direct or indirect omission or commission
by the Fund (either during the course of its daily activities or in connection
with the accuracy of its representations or its warranties in this Agreement)
caused or continues to cause the Portfolio to violate any federal or state
securities laws or regulations or any other applicable domestic or foreign law
or regulations or common law duties or obligations, but only to the extent that
such Liabilities do not arise out of and are not based upon an omission or
commission of the Portfolio or Adviser;

                      (ii) arise out of any misstatement of a material fact or
an omission of a material fact in the Fund's registration statement (including
amendments thereto) or included in Fund advertising or sales literature, other
than information provided by the Portfolio or the Adviser or included in Fund
advertising or sales literature at the request of the Portfolio or the Adviser;

                      (iii) result from the failure of any representation or
warranty made by the Fund to be accurate when made or the failure of the Fund to
perform any covenant contained herein or to otherwise comply with the terms of
this Agreement;

                      (iv) arise out of any unlawful or negligent act of the
Fund or any director, officer, employee or agent of Fund, whether such act was
committed against the Fund, the Portfolio, Adviser or any third party;

                      (v) arise out of any claim that the use of the names
"Standard & Poor's," "S&P," "Standard & Poor's 500" or "500" by the Fund
violates any license or infringes upon any trademark; or

provided, however, that in no case shall a Fund be liable with respect to any
claim made against any Covered Person unless the party shall have notified the
Fund in writing of the nature of the claim within a reasonable time after the
summons, other first legal process or formal or informal initiation of a
regulatory investigation or proceeding shall have been served upon or provided
to a Covered Person, or any federal, state or local tax deficiency has come to
the attention of the Adviser, the Portfolio or a Covered Person. Failure to
notify the Fund of such claim shall not


                                      -7-
<PAGE>   8

relieve it from any liability that it may have to any party otherwise than on
account of the indemnification contained in this Section.

                  (b) Each Fund will be entitled to participate at its own
expense in the defense or, if it so elects, to assume the defense of any suit
brought to enforce any such liability, but, if a Fund elects to assume the
defense, such defense shall be conducted by counsel chosen by the Fund. In the
event a Fund elects to assume the defense of any such suit and retain such
counsel, each Covered Person and any other defendant or defendants may retain
additional counsel, but shall bear the fees and expenses of such counsel unless
(A) the Fund shall have specifically authorized the retaining of such counsel or
(B) the parties to such suit include any Covered Person and the Fund, and any
such Covered Person has been advised by counsel that one or more legal defenses
may be available to it that may not be available to the Fund, in which case the
Fund shall not be entitled to assume the defense of such suit notwithstanding
its obligation to bear the fees and expenses of such counsel. A Fund shall not
be liable to indemnify any Covered Person for any settlement of any claim
affected without the Fund's written consent, which consent shall not be
unreasonably withheld or delayed. The indemnities set forth in paragraph (a)
will be in addition to any liability that the Company in respect of the Fund
might otherwise have to a Covered Person.

         3.3 The Portfolio. The Portfolio covenants that:

                  (a) Advance Review of Certain Documents. The Portfolio will
furnish the Funds, at least five (5) business days prior to filing with drafts
of amendments to its registration statement on Form N-1A.

                  (b) Tax Status. The Portfolio will qualify to be taxable as a
partnership under the Code for all periods during which this Agreement is in
effect, except to the extent that the failure to so qualify results from any
action or omission of a Fund.

                  (c) Insurance. The Portfolio shall at all times maintain
errors and omissions liability insurance covering losses for negligence and
wrongful acts in an amount not less than $5 million.

                  (d) Availability of Interests. Conditional upon the Fund
complying with the terms of this Agreement, the Portfolio shall permit each Fund
to make additional Investments in the Portfolio on each business day on which
shares of the Fund are sold to the public; provided, however, that the Portfolio
may refuse to permit a Fund to make additional Investments in the Portfolio on
any day on which (i) the Portfolio has refused to permit all other investors in
the Portfolio to make additional Investments in the Portfolio or (ii) the
Trustees of the Portfolio have reasonably determined that permitting additional
Investments by the Fund in the Portfolio would constitute a breach of their
fiduciary duties to the Portfolio.

                  (e) Investment Objective. Portfolio will notify the Funds at
least 60 days prior to changing its investment objective or policies.



                                      -8-
<PAGE>   9

         3.4 Indemnification by Adviser.

                  (a) The Adviser will indemnify and hold harmless the Trusts,
the Funds, their respective trustees, officers and employees and each other
person who controls each Fund, as the case may be, within the meaning of Section
15 of the 1933 Act (each, a "Covered Person" and collectively, "Covered
Persons"), against any and all losses, claims, demands, damages, liabilities and
expenses (each, a "Liability" and collectively, the "Liabilities") (including
the reasonable costs of investigating and defending against any claims therefor
and any counsel fees incurred in connection therewith), joint or several,
whether incurred directly by the Fund or through the Fund's Investment in the
Portfolio, which

                      (i) arise out of or are based upon any of the Securities
Laws, any other statute or common law or are incurred in connection with or as a
result of any formal or informal administrative proceeding or investigation by a
regulatory agency, insofar as such Liabilities arise out of or are based upon
the ground or alleged ground that any direct or indirect omission or commission
by the Portfolio (either during the course of its daily activities or in
connection with the accuracy of its representations or its warranties in this
Agreement) caused or continues to cause the Fund to violate any federal or state
securities laws or regulations or any other applicable domestic or foreign law
or regulations or common law duties or obligations, but only to the extent that
such Liabilities do not arise out of and are not based upon an omission or
commission of the Fund;

                      (ii) arise out of or are based upon an inaccurate
calculation of the Portfolio's net asset value (whether by the Portfolio, the
Adviser or any party retained for that purpose);

                      (iii) arise out of (A) any misstatement of a material fact
or an omission of a material fact in the Portfolio's registration statement
(including amendments thereto) or included at the Adviser's or Portfolio's
request in advertising or sales literature used by the Fund, or (B) any
misstatement of a material fact or an omission of a material fact in the
registration statement or advertising or sales literature of any investor in the
Portfolio, other than the Fund;

                      (iv) arise out of the Portfolio's having caused the Fund
to fail to qualify as a regulated investment company under the Code;

                      (v) result from the failure of any representation or
warranty made by the Portfolio or Adviser to be accurate when made or the
failure of the Portfolio or Adviser to perform any covenant contained herein or
to otherwise comply with the terms of this Agreement;

                      (vi) arise out of any unlawful or negligent act by the
Portfolio, the Adviser or any director, trustee, officer, employee or agent of
the Portfolio or Adviser, whether such act was committed against the Portfolio,
the Fund or any third party;

                      (vii) arise out of any claim that the systems,
methodologies, or technology used in connection with operating the Portfolio,
including the technologies associated



                                      -9-
<PAGE>   10

with maintaining the master-feeder structure of the Portfolio, violates any
license or infringes upon any patent or trademark;

                      (viii) arise out of any claim that the use of the names
"Standard & Poor's," "S&P," "Standard & Poor's 500," "S&P 500" or 500" by the
Portfolio violates any license or infringes upon any trademark; or

                      (ix) result from any Liability of the Portfolio to any
investor in the Portfolio (or shareholder thereof), other than the Fund (and its
shareholders); provided, however, that in no case shall the Adviser be liable
with respect to any claim made against any such Covered Person unless such
Covered Person shall have notified the Adviser in writing of the nature of the
claim within a reasonable time after the summons, other first legal process or
formal or informal initiation of a regulatory investigation or proceeding shall
have been served upon or provided to a Covered Person or any federal, state or
local tax deficiency has come to the attention of the Fund or a Covered Person.
Failure to notify the Adviser of such claim shall not relieve it from any
liability that it may have to any Covered Person otherwise than on account of
the indemnification contained in this paragraph.

                  (b) The Adviser will be entitled to participate at its own
expense in the defense or, if it so elects, to assume the defense of any suit
brought to enforce any such liability, but, if the Adviser elects to assume the
defense, such defense shall be conducted by counsel chosen by the Adviser. In
the event the Adviser elects to assume the defense of any such suit and retain
such counsel, each Covered Person and any other defendant or defendants may
retain additional counsel, but shall bear the fees and expenses of such counsel
unless (A) the Adviser shall have specifically authorized the retaining of such
counsel or (B) the parties to such suit include any Covered Person and the
Adviser, and any such Covered Person has been advised by counsel that one or
more legal defenses may be available to it that may not be available to the
Adviser, in which case the Adviser shall not be entitled to assume the defense
of such suit notwithstanding its obligation to bear the fees and expenses of
such counsel. The Adviser shall not be liable to indemnify any Covered Person
for any settlement of any claim affected without the Adviser's written consent,
which consent shall not be unreasonably withheld or delayed. The indemnities set
forth in paragraph (a) will be in addition to any liability that the Company in
respect of the Adviser might otherwise have to a Covered Person.

         3.5 In-Kind Redemption. In the event a Fund desires to withdraw or
redeem all of its Interests in the Portfolio, unless otherwise agreed to by the
parties, the Portfolio will effect such redemption "in kind" and in such a
manner that the securities delivered to the Fund's custodian for the account of
the Fund will mirror, as closely as practicable, the composition of the
Portfolio immediately prior to such redemption. No other withdrawal or
redemption of any Interest in the Portfolio will be satisfied by means of an "in
kind" redemption except in compliance with Rule 18f-1 under the 1940 Act,
provided, however, that for purposes of determining compliance with Rule 18f-1,
each shareholder of the Fund redeeming shares of the Fund on a particular day
will be treated as a direct holder of an Interest in the Portfolio being
redeemed that day.

         3.6 Auditors. In the event a Fund's independent public accountants
differ from those of the Portfolio, the Portfolio shall be responsible for any
costs and expenses associated with the



                                      -10-
<PAGE>   11

need for the Portfolio's independent public accountants to provide information
to the Fund's independent public accountants.

         3.7 Reasonable Actions. Each party covenants that it will, subject to
the provisions of this Agreement, from time to time, as and when requested by
another party or in its own discretion, as the case may be, execute and deliver
or cause to be executed and delivered all such assignments and other
instruments, take or cause to be taken such actions, and do or cause to be done
all things reasonably necessary, proper or advisable in order to consummate the
transactions contemplated by this Agreement and to carry out its intent and
purpose.

                                       IV
                              CONDITIONS PRECEDENT

         The obligations of each party to consummate the transactions provided
for herein shall be subject to (a) all representations and warranties of the
other parties contained in this Agreement being true and correct in all material
respects as of the date hereof and, except as they may be affected by the
transactions contemplated by this Agreement, and (b) the following further
conditions that shall be fulfilled on or before investment:

         4.1 Regulatory Status. All necessary filings shall have been made with
the SEC and state securities authorities, and no order or directive shall have
been received that any other or further action is required to permit the parties
to carry out the transactions contemplated hereby.

         4.2 Investment Objective/Restrictions. The Funds shall have the same
investment objective and substantively the same investment restrictions as the
Portfolio.

                                        V
                              ADDITIONAL AGREEMENTS

         5.1 Notification of Certain Matters. Each party will give prompt notice
to the other parties of (a) the occurrence or non-occurrence of any event the
occurrence or non-occurrence of which would be likely to cause any
representation or warranty contained in this Agreement to be untrue or
inaccurate, and (b) any material failure of a party or any trustee, director,
officer, employee or agent thereof to comply with or satisfy any covenant,
condition or agreement to be complied with or satisfied by such person
hereunder; provided, however, that the delivery of any notice pursuant to this
Section 5.1 shall not limit or otherwise affect the remedies available,
hereunder or otherwise, to the party receiving such notice.

         5.2 Access to Information. The Portfolio and the Funds shall afford
each other access at all reasonable times to such party's officers, employees,
agents and offices and to all its relevant books and records and shall furnish
each other party with all relevant financial and other data and information as
requested; provided, however, that nothing contained herein shall obligate the
Funds to provide the Portfolio with access to the books and records of the Funds
relating to any other series of the Funds other than the Funds, nor shall
anything contained herein obligate the Funds to furnish the Portfolio with the
Funds' shareholder list, except as may be required to comply with applicable law
or any provision of this Agreement.



                                      -11-
<PAGE>   12

         5.3 Confidentiality. Each party agrees that it shall hold in strict
confidence all data and information obtained from another party (unless such
information is or becomes readily ascertainable from public or published
information or trade sources) and shall ensure that its officers, employees and
authorized representatives do not disclose such information to others without
the prior written consent of the party from whom it was obtained, except if
disclosure is required by the SEC, any other regulatory body or the Funds' or
Portfolio's respective auditors, or in the opinion of counsel such disclosure is
required by law, and then only with as much prior written notice to the other
party as is practical under the circumstances.

         5.4 Public Announcements. No party shall issue any press release or
otherwise make any public statements with respect to the matters covered by this
Agreement without the prior consent of the other parties hereto, which consent
shall not be unreasonably withheld; provided, however, that consent shall not be
required if, in the opinion of counsel, such disclosure is required by law,
provided further, however, that the party making such disclosure shall provide
the other parties hereto with as much prior written notice of such disclosure as
is practical under the circumstances.

                                       VI
                        TERMINATION, AMENDMENT AND WAIVER

         6.1 Termination.

                  (a) This Agreement may be terminated by each Fund upon five
(5) business days notice to the Portfolio and the Adviser.

                  (b) This Agreement may be terminated at any time by a Fund by
withdrawing all of the Fund's Interest in the Portfolio.

                  (c) This Agreement may be terminated on not less than 120
days' prior written notice by the Portfolio to the Funds.

                  (d) This Agreement may be terminated at any time immediately
upon written notice to the other parties in the event that formal proceedings
are instituted against another party to this Agreement by the SEC or any other
regulatory body, provided that the terminating party has a reasonable belief
that the institution of the proceeding is not without foundation and will have a
material adverse impact on the terminating party.

                  (e) The indemnification obligations set forth in Article III
and the confidentiality provisions in Section 5.3 shall survive the termination
of this Agreement.

         6.2 Amendment. This Agreement may be amended, modified or supplemented
at any time in such manner as may be mutually agreed upon in writing by the
parties.



                                      -12-
<PAGE>   13
                                       VII
                               GENERAL PROVISIONS

         7.1 Notices. All notices and other communications given or made
pursuant hereto shall to in writing and shall be deemed to have been duly given
or made when actually received in person or by fax, or three days after being
sent by certified or registered United States mail, return receipt requested,
postage prepaid, addressed as follows:


If to the Funds:           AMR Investment Services, Inc.
                           4333 Amon Carter Blvd., MD 5645
                           Fort Worth, Texas  76155
                           Attn: William F. Quinn, President
                           Fax:  (817) 963-3902

If to the Adviser:         State Street Bank and Trust Company
                           P. O. Box 1713
                           Boston, Massachusetts 02105-1713
                           Attn:  Julie Tedesco
                           Fax: (617) 662-3805

If to the Portfolio:       State Street Master Funds
                           c/o State Street Bank and Trust Company
                           P. O. Box 1713
                           Boston, Massachusetts 02105-1713
                           Attn:  Julie Tedesco
                           Fax: (617) 662-3805

Any party to this Agreement may change the identity of the person to receive
notice by providing written notice thereof to all other parties to the
Agreement.

         7.2 Expenses. Unless stated otherwise herein, all costs and expense
associated with this Agreement and the transactions contemplated hereby shall be
paid by the party incurring such costs and expenses.

         7.3 Headings. The headings and captions contained in this Agreement are
for reference purposes only and shall not affect in any way the meaning or
interpretation of this Agreement.

         7.4 Severability. If any term or other provision of this Agreement is
invalid, illegal or incapable of being enforced by any rule of law, or public
policy, all other conditions and provisions of this Agreement shall nevertheless
remain in full force and effect so long as the economic or legal substance of
the transactions contemplated hereby is not affected in any manner adverse to
any party. Upon such determination that any term or other provision is invalid,
illegal or incapable of being enforced, the parties hereto shall negotiate in
good faith to modify this Agreement so as to effect the original intent of the
parties as closely as possible in an



                                      -13-
<PAGE>   14

acceptable manner to the end that the transactions contemplated hereby are
fulfilled to the extent possible.

         7.5 Entire Agreement. This Agreement and the agreements and other
documents delivered pursuant hereto set forth the entire understanding between
the parties concerning the subject matter of this Agreement and incorporate or
supersede all prior negotiations and understandings. There are no covenants,
promises, agreements, conditions or understandings, either oral or written,
between them relating to the subject matter of this Agreement other than those
set forth herein.

         7.6 Successors and Assignments. Each and all of the provisions of this
Agreement shall be binding upon and inure to the benefit of the parties hereto
and, except as otherwise specifically provided in this Agreement, their
respective successors and assigns. Notwithstanding the foregoing, no party shall
make any assignment of this Agreement or any rights or obligations hereunder
without the written consent of all other parties. As used herein, the term
"assignment" shall have the meaning ascribed thereto in the 1940 Act.

         7.7 Governing Law. This Agreement shall be governed by and construed in
accordance with the laws of the Commonwealth of Massachusetts without giving
effect to the choice of law or conflicts of law provisions thereof.

         7.8 Counterparts. This Agreement may be executed in any number of
counterparts, all of which shall constitute one and the same instrument, and any
party hereto may execute this Agreement by signing one or more counterparts.

         7.9 Third Parties. Nothing herein expressed or implied is intended or
shall be construed to confer upon or give any person, other than the parties
hereto and their successors or assigns, any rights or remedies under or by
reason of this Agreement.

         7.10 Interpretation. Any uncertainty or ambiguity existing herein shall
not presumptively be interpreted against any party, but shall be interpreted
according to the application of the rules of interpretation for arm's length
agreements.

         7.11 Limitation of Liability. Each party expressly acknowledges the
provision in the Declaration of Trust of each of the Trusts and the Portfolio
limiting the personal liability of shareholders and the officers and trustees of
the Trusts and the Portfolio.

         7.12 Additional Limitations of Liability. The parties hereto agree and
acknowledge that (a) the Trusts have entered into this Agreement solely on
behalf of the Funds and no other series of the Trusts shall have any obligation
hereunder with respect to any liability of the Trusts arising hereunder; (b) the
Portfolio has entered into this Agreement solely on its own behalf and no other
series of the State Street Master Funds shall have any obligation hereunder with
respect to any liability of the Portfolio arising hereunder; and (c) no series
or feeder participant of the Portfolio shall be liable to any other series or
feeder participant of the Portfolio.



                                      -14-
<PAGE>   15

         IN WITNESS WHEREOF, the parties have caused this Agreement to be
executed by their respective officers, thereunto duly authorized, as of the date
first written above.

                  AMERICAN AADVANTAGE FUNDS, on behalf of itself and the
                  AMERICAN AADVANTAGE S&P 500 INDEX FUND, a series thereof

                  AMERICAN AADVANTAGE MILEAGE FUNDS, on behalf of itself and the
                  AMERICAN AADVANTAGE S&P 500 INDEX MILEAGE FUND, a series
                  thereof


                  /s/ William F. Quinn
                  -----------------------------------------
                  By:  William F. Quinn
                  Its:   President

                  State Street Equity 500 Index Portfolio


                  /s/ James B. Little
                  -----------------------------------------
                  By: James B. Little
                      -------------------------------------
                  Its: President and Treasurer
                       ------------------------------------

                  State Street Bank and Trust Company


                  /s/ Kathleen C. Cuocolo
                  -----------------------------------------
                  By: Kathleen C. Cuocolo
                      -------------------------------------
                  Its: Senior Vice President
                       ------------------------------------



                                      -15-

<PAGE>   1
                             DISTRIBUTION AGREEMENT


         This Distribution Agreement is made this 31st day of December , 1999,
by and among American AAdvantage Funds, American AAdvantage Mileage Funds and
American Select Funds, each a Massachusetts business trust (the "Trusts"), SWS
Financial Services, Inc. ("SWS" or the "Distributor"), a Texas corporation, and
AMR Investment Services, Inc. ("AMR"), a Delaware corporation.

         WHEREAS, the Trusts are registered as open-end, diversified management
investment companies under the Investment Company Act of 1940, as amended (the
"1940 Act"), and have registered and intend to continue to register their shares
of beneficial interest (the "Shares") for sale to the public under the
Securities Act of 1933, as amended (the "1933 Act"), and various state
securities laws; and

         WHEREAS, the Trusts offer for public sale one or more distinct series
of shares of beneficial interest, each corresponding to a distinct portfolio
("Portfolio"); and

         WHEREAS, each Trust wishes to retain SWS as the Trust's Distributor in
connection with the offering and sale of the Shares of each current Portfolio
and such other Portfolios as agreed upon between the Trust and SWS from time to
time and to furnish certain other services to the Trust as specified in this
Agreement;

         WHEREAS, this Agreement has been approved by a vote of the Board of
Trustees of each Trust in conformity with Paragraph (b)(2) of Rule 12b-1 under
the 1940 Act;

         WHEREAS, AMR is the Manager of each Trust; and

         WHEREAS, SWS is willing to act as Distributor and to furnish such
services on the terms and conditions hereinafter set forth;

         NOW, THEREFORE, in consideration of the premises and mutual covenants
herein contained, it is agreed between the parties hereto as follows:

         1. APPOINTMENT OF SWS. The Trusts hereby appoint SWS as Distributor of
their Shares. As such, SWS agrees to act as agent for the Trusts and, subject to
applicable federal and state laws and the Declaration of Trust, By-Laws and
current Prospectus and Statement of Additional Information of each Trust, (a) to
solicit orders for the purchase of the Shares, subject to such terms and
conditions as each Trust may specify, (b) to hold itself available to receive
orders for the purchase and redemption of the Shares, and to accept such orders
on behalf of each Trust as of the time of receipt of such orders and promptly
transmit such orders as are accepted to the Trust and its transfer agents, and
(c) to make Shares available through the National Securities


                                      -1-
<PAGE>   2


Clearing Corporation's FundServ system. Orders shall be deemed effective at the
time and in the manner set forth in the Registration Statement. SWS shall offer
the Shares of each Portfolio on an agency or "best efforts" basis under which
each Trust shall only issue such Shares as are actually sold. The public
offering price of the Shares of each Portfolio shall be the net asset value per
share (as determined by each Trust) of the outstanding Shares of the Portfolio
as set forth in the Registration Statement. The Trusts reserve the right at any
time to withdraw all offerings of the Shares of any or all Portfolios by notice
to SWS.

         2. TRUST OBLIGATIONS. Each Trust shall keep SWS fully informed of its
affairs and shall make available to SWS copies of all information, financial
statements and other papers that SWS may reasonably request for use in
connection with the distribution of shares, including, without limitation, such
reasonable number of copies of the most current prospectus, statement of
additional information, and annual and interim reports of a Portfolio as SWS may
request, and each Trust shall cooperate fully in the efforts of SWS to sell and
arrange for the sale of the Shares.

         3. SALES TO DEALERS. SWS, with the consent of the Trusts or AMR, may
enter into agreements to sell shares to registered and qualified retail dealers.

         4. SALES MATERIALS. SWS shall provide to investors and potential
investors only such information regarding the Trusts as is permitted by
applicable law. To the extent reasonably requested by AMR, SWS will file
proposed advertisements and sales literature with appropriate regulators and
consult with AMR regarding any comments provided by regulators with respect to
such materials.

         5. COMPENSATION. As compensation for providing services under this
agreement, AMR (and not the Trusts) shall pay to SWS the sum of (a) $50,000
annually, payable monthly in arrears, (b) the ongoing licensing fees and
incidental costs of those employees of AMR who are designated by AMR to become
registered representatives of SWS, (c) the compensation paid by SWS to such
registered representatives in accordance with compensation schedules, as agreed
upon by SWS and AMR from time to time; (d) the reasonable fees associated with
listing and maintaining shares on the National Securities Clearing Corporation's
FundServ system, as agreed upon by SWS and AMR; and (e) incidental expenses
associated with printing and distributing advertising and sales literature.

         6. TRUST EXPENSES. Each Trust agrees, at its own expense, to register
Shares with the Securities and Exchange Commission ("SEC"), state and other
regulatory bodies, and to prepare and file from time to time such registration
statements, amendments, reports and other documents as may be necessary to offer
and sell Shares. Each Portfolio shall bear all expenses related to preparing and
typesetting Prospectuses, Statements of Additional Information and other
materials required by law and such other expenses, including printing and
mailing expenses, related to the Portfolio's communications with persons who are
shareholders of that Portfolio.


                                      -2-
<PAGE>   3


Except as specifically provided in this Agreement, the Trusts and the Portfolios
shall bear none of the expenses of SWS in connection with its offer and sale of
the Shares.

         7. INDEMNIFICATION BY THE TRUSTS AND AMR. The Trusts and AMR will
indemnify, defend and hold harmless SWS, its officers and directors, and any
person who controls SWS within the meaning of Section 15 of the 1933 Act
(collectively, "SWS Indemnified Persons") from and against any and all claims,
demands, liabilities and expenses (including the reasonable cost of
investigating or defending such claims, demands or liabilities) that any SWS
Indemnified Person may incur under the 1933 Act, common law or otherwise arising
out of or based upon any (a) untrue statement of a material fact in the
Registration Statement, (b) omission to state a material fact in the
Registration Statement, or (c) failure by the Trusts or AMR to comply with the
terms of this Agreement, provided that this Agreement shall not protect any SWS
Indemnified Person from liability to which such person otherwise would be
subject by reason of willful misfeasance, bad faith, or gross negligence in the
performance of its duties, or by reason of its reckless disregard of its duties
under this Agreement.

         8. INDEMNIFICATION BY SWS. SWS will indemnify, defend and hold harmless
the Trusts and their Portfolios, AMR, their several officers, directors and
Trustees, and any person who controls the Trusts or AMR within the meaning of
Section 15 of the 1933 Act (collectively, "AMR Indemnified Persons") from and
against any and all claims, demands, liabilities and expenses (including the
reasonable cost of investigating or defending such claims, demands or
liabilities) that any AMR Indemnified Person may incur under the 1933 Act,
common law or otherwise arising out of or based upon any (a) untrue statement of
a material fact furnished by a SWS Indemnified Person for use in the
Registration Statement, (b) failure by such a person to state a material fact
therein as necessary to make the statements therein not misleading, or (c)
failure by SWS to comply with the terms of this Agreement or applicable law,
provided that this Agreement shall not protect any AMR Indemnified Person from
liability to which such person otherwise would be subject by reason of willful
misfeasance, bad faith, or gross negligence in the performance of its duties, or
by reason of its reckless disregard of its obligations and duties under this
Agreement.

         9. SHARE CERTIFICATES. The Trusts shall not issue certificates
representing Shares unless requested to do so by a shareholder. If such request
is transmitted through SWS, the Trusts will cause certificates evidencing the
Shares owned to be issued in such names and denominations as SWS shall from time
to time direct.

         10. STATUS OF SWS. SWS is an independent contractor and shall be agent
for the Trusts only with respect to the sale and redemption of Shares.

         11. NON-EXCLUSIVE SERVICES. The services of SWS to the Trusts under
this Agreement are not to be deemed exclusive, and SWS shall be free to render
similar services or other services to others so long as its services hereunder
are not impaired thereby.


                                      -3-
<PAGE>   4


         12. REPORTS BY SWS. SWS shall prepare reports for the Trustees
regarding its activities under this Agreement as from time to time shall be
reasonably requested by the Trustees.

         13. DEFINITIONS. As used herein: the term "Registration Statement"
shall mean the registration statement filed by the Trusts with the SEC and
effective under the 1933 Act, as such Registration Statement is amended or
supplemented from time to time; the terms "Prospectus" and "Statement of
Additional Information" shall mean the current form of prospectus(es) and
statement(s) of additional information filed by the Trusts as part of the
Registration Statement; the term "net asset value" shall have the meaning
ascribed to it in each Trust's Declaration of Trust; the term "Trustees" shall
refer to the Board of Trustees of each Trust; and the terms "affiliated person,"
"assignment," "interested person," and "majority of the outstanding voting
securities" shall have the meanings given to them by Section 2(a) of the 1940
Act, subject to such exemptions as may be granted by the SEC by any rule,
regulation or order.

         14. EFFECTIVENESS OF AGREEMENT. This Agreement shall become effective
upon the date hereinabove written, provided that, with respect to a Portfolio,
this Agreement shall not take effect unless such action has first been approved
by vote of a majority of the Trustees of each Trust and by vote of a majority of
those Trustees who are not interested persons of the Trusts or SWS (all such
Trustees collectively being referred to herein as the "Independent Trustees"),
cast in person at a meeting called for the purpose of voting on such action.

         15. TERMINATION OF AGREEMENT. Unless sooner terminated as provided
herein, this Agreement shall continue in effect for one year from the above
written date. Thereafter, if not terminated, this Agreement shall continue
automatically for successive periods of twelve months each, provided that such
continuance is approved at least annually (a) by a vote of a majority of the
Independent Trustees, cast in person at a meeting called for the purpose of
voting on such approval, and (b) by the Board of Trustees of each Trust or, with
respect to any given series, by vote of a majority of the outstanding voting
securities of such Portfolio. Notwithstanding the foregoing, with respect to any
Portfolio, this Agreement may be terminated at any time, without the payment of
any penalty, by vote of the Board of Trustees of a Trust, by vote of a majority
of the Independent Trustees of a Trust or by vote of a majority of the
outstanding voting securities of such Portfolio on 180 days' written notice to
SWS or by SWS at any time, without the payment of any penalty, on 180 days'
written notice to the Trust or such Portfolio. Termination of this Agreement
with respect to any given Portfolio shall not affect the continued validity of
this Agreement or the performance thereunder with respect to any other
Portfolio. This Agreement automatically will terminate in the event of its
assignment.

         16. AMENDMENTS. No provision of this Agreement may be changed, waived,
discharged or terminated orally, but only by an instrument in writing signed by
the party against which enforcement of the change, waiver, discharge or
termination is sought.


                                      -4-
<PAGE>   5


         17. GOVERNING LAW. This Agreement shall be construed in accordance with
the laws of the State of Texas, without giving effect to the conflicts of laws
principles thereof, and the 1940 Act. To the extent that the applicable laws of
the State of Texas conflict with the applicable provisions of the 1940 Act,
however, the 1940 Act shall control.

         18. REPRESENTATIONS. SWS represents and warrants that it (a) is duly
authorized to enter into this Agreement, (b) is duly registered and licensed as
a broker-dealer and in good standing with the National Association of Securities
Dealers, Inc. and all applicable state securities regulators and that it is duly
authorized and qualified to perform the services set forth in this Agreement,
and (c) promptly will notify AMR and each Trust if SWS or any of its affiliated
persons become subject to a legal proceeding which, if adversely decided, could
impair SWS's ability to satisfy its obligations under this Agreement.

         19. NOTICE. Any notice required or permitted to be given by either
party to the other shall be deemed sufficient upon receipt in writing at the
other party's principal offices.

         20. MISCELLANEOUS. The captions in this Agreement are included for
convenience of reference only and in no way define or delimit any of the
provisions hereof or otherwise affect their construction or effect.

         21. MASSACHUSETTS BUSINESS TRUST. The Trusts are Massachusetts business
trusts. A copy of each Trust's Declaration of Trust of the Trust is on file with
the Secretary of the Commonwealth of Massachusetts. This Agreement is not
binding upon any of the Trustees, officers or shareholders of the Trusts
individually, and no such person shall be individually liable with respect to
any action or inaction resulting from this Agreement.


                                      -5-
<PAGE>   6


         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed by their officers thereunto duly authorized.


Attest:                                  AMERICAN AADVANTAGE FUNDS



By:                                      By:
    ---------------------------              -----------------------------------

                                         Title:
                                                --------------------------------


Attest:                                  AMERICAN AADVANTAGE MILEAGE FUNDS



By:                                      By:
    ---------------------------              -----------------------------------

                                         Title:
                                                --------------------------------


Attest:                                  AMERICAN SELECT FUNDS



By:                                      By:
    ---------------------------              -----------------------------------

                                         Title:
                                                --------------------------------


Attest:                                  SWS FINANCIAL SERVICES, INC.



By:                                      By:
    ---------------------------              -----------------------------------

                                         Title:
                                                --------------------------------




                                      -6-
<PAGE>   7



Attest:                                  AMR INVESTMENT SERVICES, INC.



By:                                      By:
    ---------------------------              -----------------------------------

                                         Title:
                                                --------------------------------


                                      -7-

<PAGE>   1

                    [KIRKPATRICK & LOCKHART LLP LETTERHEAD]


February 29, 2000

American AAdvantage Funds
4333 Amon Carter Boulevard
Fort Worth, Texas 76155

Ladies and Gentlemen:

     You have requested our opinion as to certain matters regarding the issuance
by American AAdvantage Funds (the "Trust") of shares of beneficial interest in
connection with the filing of Post-Effective Amendment No. 29 to its
Registration Statement on Form N-1A ("PEA No. 29"). As used in this letter, the
term "Shares" means: (1) the Institutional, PlanAhead and AMR Class shares of
beneficial interest of the Balanced Fund, Large Cap Fund, International Equity
Fund, Small Cap Value Fund, Intermediate Bond Fund, and Short-Term Bond Fund;
(2) the Institutional and PlanAhead Class shares of the S&P 500 Index Fund; and
(3) the Institutional, PlanAhead and Platinum Class shares of the Money Market
Fund, Municipal Money Market Fund, and U.S. Government Money Market Fund.

     As the Trust's counsel, we have examined certified or other copies,
believed by us to be genuine, of the Trust's Declaration of Trust and by-laws
and such resolutions and minutes of meetings of the Trust's Board of Trustees as
we have deemed relevant to our opinion, as set forth herein. Our opinion is
limited to the laws and facts in existence on the date hereof, and it is further
limited to the laws (other than the conflict of law rules) in the Commonwealth
of Massachusetts that in our experience are normally applicable to the issuance
of shares by unincorporated voluntary associations and to the Securities Act of
1933 ("1933 Act"), the Investment Company Act of 1940 ("1940 Act") and the
regulations of the Securities and Exchange Commission ("SEC") thereunder.

     Based on present laws and facts, we are of the opinion that the issuance of
the Shares has been duly authorized by the Trust and that, when sold in
accordance with the terms contemplated by the PEA No. 29, including receipt by
the Trust of full payment for the Shares and compliance with the 1933 Act and
the 1940 Act, the Shares will have been validly issued, fully paid and
non-assessable.

     We note, however, that the Trust is an entity of the type commonly known as
a "Massachusetts business trust." Under Massachusetts law, shareholders could,
under



<PAGE>   2


American AAdvantage Funds
February 29, 2000
Page 2

certain circumstances, be held personally liable for the obligations of the
Trust. The Declaration of Trust states that all persons extending credit to,
contracting with or having any claim against the Trust or the Trustees shall
look only to the assets of the Trust for payment under such credit, contract or
claim; and neither the Shareholders nor the Trustees, nor any of their agents,
whether past, present or future, shall be personally liable therefor. It also
requires that every note, bond, contract or other undertaking issued by or on
behalf of the Trust or the Trustees relating to the Trust shall include a
recitation limiting the obligation represented thereby to the Trust and its
assets. The Declaration of Trust further provides: (1) for indemnification from
the assets of the Trust for all loss and expense of any shareholder held
personally liable for the obligations of the Trust by virtue of ownership of
shares of the Trust; and (2) for the Trust to assume the defense of any claim
against the shareholder for any act or obligation of the Trust. Thus, the risk
of a shareholder incurring financial loss on account of shareholder liability is
limited to circumstances in which the Trust or series would be unable to meet
its obligations.

     We hereby consent to this opinion accompanying PEA No. 29 when it is filed
with the SEC and to the reference to our firm in PEA No. 29.

                                       Very truly yours,

                                       KIRKPATRICK & LOCKHART LLP



                                       By /s/ Robert J. Zutz
                                          ---------------------------------
                                          Robert J. Zutz

<PAGE>   1
                         Consent of Independent Auditors

We consent to the reference to our firm under the captions "Financial
Highlights", "Other Service Providers" and "Financial Statements" and to the use
of our reports dated December 17, 1999 and February 11, 2000 in the Registration
Statement (Form N-1A) of the American AAdvantage Funds and their incorporation
by reference in the related Prospectuses and Statements of Additional
Information, filed with the Securities and Exchange Commission in this
Post-Effective Amendment No. 29 to the Registration Statement under the
Securities Act of 1933 (File No. 33-11387) and in this Amendment No. 30 to the
Registration Statement under the Investment Company Act of 1940 (File
No. 811-4984).




                                                     /s/ ERNST & YOUNG LLP



Dallas, Texas
February 25, 2000
<PAGE>   2


                       CONSENT OF INDEPENDENT ACCOUNTANTS


We hereby consent to the incorporation by reference in this Registration
Statement on Form N-1A of our report dated February 11, 2000, relating to the
financial statements and financial highlights which appears in the December 31,
1999 Annual Report to Shareholders of S&P 500 Index Fund (one of the funds
comprising the American AAdvantage Funds), which is also incorporated by
reference into the Registration Statement. We also consent to the references to
us under the headings "Financial Highlights", in such Registration Statement.


/s/ PricewaterhouseCoopers LLP
Baltimore, Maryland
March 1, 2000


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