SOUTHWEST AIRLINES CO
10-K, 1998-03-19
AIR TRANSPORTATION, SCHEDULED
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                    FORM 10-K

(Mark One)
[X]     ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
        EXCHANGE ACT OF 1934

For the Fiscal Year Ended December 31, 1997 or

[ ]     TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
        EXCHANGE ACT OF 1934

For the transition period from ____________ to ____________

Commission File No. 1-7259

                             SOUTHWEST AIRLINES CO.
             (Exact name of registrant as specified in its charter)

                 TEXAS                                         74-1563240
    (State or other jurisdiction of                         (I.R.S. employer
    incorporation or organization)                          identification no.)

           P.O. BOX 36611
             DALLAS, TEXAS                                     75235-1611
(Address of principal executive offices)                       (Zip Code)

       Registrant's telephone number, including area code: (214) 792-4000

           SECURITIES REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT:

                                                        NAME OF EACH EXCHANGE
     TITLE OF EACH CLASS                                 ON WHICH REGISTERED
     -------------------                                ---------------------

Common Stock ($1.00 par value)                     New York Stock Exchange, Inc.
Common Share Purchase Rights                       New York Stock Exchange, Inc.

           SECURITIES REGISTERED PURSUANT TO SECTION 12(g) OF THE ACT:

                                      None

        Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days. Yes [X] No [ ]

        Indicate by check mark if disclosure of delinquent filers pursuant to
Item 405 of Regulation S-K is not contained herein, and will not be contained,
to the best of registrant's knowledge, in definitive proxy or information
statements incorporated by reference in Part III of this Form 10-K or any
amendment to this Form 10-K. [ ]

           Aggregate market value of Common Stock held by nonaffiliates as of
March 2, 1998:

                                 $6,365,558,997

      Number of shares of Common Stock outstanding as of the close of business
on March 2, 1998:

                               222,627,708 shares

                       DOCUMENTS INCORPORATED BY REFERENCE

        Proxy Statement for Annual Meeting of
        Shareholders, May 21, 1998:                     PART III



================================================================================

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                                     PART I

ITEM 1. BUSINESS

DESCRIPTION OF BUSINESS

     Southwest Airlines Co. (Southwest) is a major domestic airline that
provides primarily shorthaul, high frequency, point-to-point, low fare service.
Southwest was incorporated in Texas and commenced Customer Service on June 18,
1971 with three Boeing 737 aircraft serving three Texas cities - Dallas,
Houston, and San Antonio.

     At yearend 1997, Southwest operated 261 Boeing 737 aircraft and provided
service to 52 airports in 51 cities in 25 states throughout the United States.
Southwest commenced service to Jackson, Mississippi in August 1997.

     On December 31, 1993, Southwest acquired Morris Air Corporation (Morris) in
a stock-for-stock exchange, issuing approximately 3.6 million shares (not
adjusted for subsequent stock split) of Southwest Common Stock in exchange for
all of the outstanding shares of Morris. During 1994, the operations of Morris
were substantially integrated with those of Southwest, and Morris ceased service
as a certificated air carrier in March 1995. Unless the context requires
otherwise, references in this annual report to the "Company" include Southwest
and Morris.

     The business of the Company is somewhat seasonal. Quarterly operating
income and, to a lesser extent, revenues tend to be lower in the first quarter
(January 1 - March 31).

FUEL

     The cost of fuel is an item having significant impact on the Company's
operating results. The Company's average cost of jet fuel per gallon (excluding
taxes) for scheduled carrier service over the past five years was as follows:

                        1993                    $.59
                        1994                    $.54
                        1995                    $.55
                        1996                    $.65
                        1997                    $.62

     The Company is unable to predict the extent of future fuel cost changes.
The Company has standard industry arrangements with major fuel suppliers.
Standard industry fuel contracts do not provide material protection against
price increases or for assured availability of supplies. Although market
conditions can significantly impact the price of jet fuel, at present these
conditions have not resulted in an inadequate supply of jet fuel. For more
discussion of current jet fuel costs and the impact of these costs on the
Company's operations, see Management's Discussion and Analysis of Financial
Condition and Results of Operations.

REGULATION

     Economic. The Dallas Love Field section of the International Air
Transportation Competition Act of 1979, as amended in 1997, (commonly known as
the "Wright Amendment"), as it affects Southwest's scheduled service, provides
that no common carrier may provide scheduled passenger air transportation for
compensation between Love Field and one or more points outside Texas, except
that an air carrier may

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transport individuals by air on a flight between Love Field and one or more
points within the states of Alabama, Arkansas, Kansas, Louisiana, Mississippi,
New Mexico, Oklahoma, and Texas if (a) "such air carrier does not offer or
provide any through service or ticketing with another air carrier" and (b) "such
air carrier does not offer for sale transportation to or from, and the flight or
aircraft does not serve, any point which is outside any such states." Southwest
does not interline or offer joint fares with any other air carrier at Love
Field. The Wright Amendment does not restrict Southwest's intrastate Texas
flights or its air service from points other than Love Field to points beyond
Texas and the four contiguous states.

     The Department of Transportation (DOT) has significant regulatory
jurisdiction over passenger airlines. Unless exempted, no air carrier may
furnish air transportation over any route without a DOT certificate of
authorization, which does not confer either exclusive or proprietary rights. The
Company's certificates are unlimited in duration and permit the Company to
operate among any points within the United States, its territories and
possessions, except as limited by the Wright Amendment, as do the certificates
of all other U.S. carriers. DOT may revoke such certificates, in whole or in
part, for intentional failure to comply with any provisions of subchapter IV of
the Federal Aviation Act of 1958, or any order, rule or regulation issued
thereunder or any term, condition or limitation of such certificate; provided
that, with respect to revocation, the certificate holder has first been advised
of the alleged violation and has been given a reasonable time to effect
compliance.

     DOT prescribes uniform disclosure standards regarding terms and conditions
of carriage, and prescribes that terms incorporated into the Contract of
Carriage by reference are not binding upon passengers unless notice is given in
accordance with its regulations.

     Safety. The Company is subject to the jurisdiction of the Federal Aviation
Administration (FAA) with respect to its aircraft maintenance and operations,
including equipment, ground facilities, dispatch, communications, flight
training personnel, and other matters affecting air safety. To ensure compliance
with its regulations, the FAA requires airlines to obtain operating,
airworthiness and other certificates which are subject to suspension or
revocation for cause. The Company has obtained such certificates. The FAA,
acting through its own powers or through the appropriate U. S. Attorney, also
has the power to bring proceedings for the imposition and collection of fines
for violation of the Federal Air Regulations.

     Environmental. The Airport Noise and Capacity Act of 1990 (ANCA) requires
the phase out of Stage 2 airplanes (which meet less stringent noise emission
standards than later model Stage 3 airplanes) in the contiguous 48 states by
December 31, 1999. FAA rules establish a future interim compliance date for ANCA
of December 31, 1998. An operator may comply by either implementing a reduction
of the operator's base level, as defined in ANCA, of Stage 2 aircraft by at
least 75 percent at December 31, 1998, or by operating a fleet that is at least
75 percent Stage 3 by December 31, 1998. Operation of Stage 2 aircraft after
December 31, 1999 is prohibited, subject, however, to an extension of the final
compliance date to December 31, 2003, if at least 85 percent of the aircraft
used by the operator in the contiguous United States will comply with Stage 3
noise levels by July 1, 1999 and the operator successfully obtains a waiver from
the FAA of the December 31, 1999 final phaseout date. Statutory requirements to
obtain a waiver include a determination by the FAA that the waiver is in the
public interest or would enhance competition or benefit service to small
communities. There is no assurance that such a waiver is obtainable.

     The Company's fleet, as of December 31, 1997, consisted of 42 Stage 2
aircraft and 219 Stage 3 aircraft, yielding a Stage 3 percentage of over 80
percent. Accordingly, the Company exceeds the Stage 3 fleet percentage
requirement for the December 31, 1998 interim compliance date.

     As of December 31, 1997, of the 42 Stage 2 aircraft operated by the
Company, 24 are leased from third parties and 18 are owned by the Company.
Because the Company already complies with the

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December 31, 1998 interim compliance requirement of a 75 percent Stage 3 fleet,
the Company could operate its 42 remaining Stage 2 aircraft until December 31,
1999. Based upon the Company's current schedule for delivery of new Stage 3
aircraft, including options, and the Company's planned retirement schedule for
Stage 2 aircraft, assuming no hushkitting, the Company will achieve 85 percent
compliance by July 1, 1999; however, the Company currently intends to hushkit at
least 20 aircraft. This would qualify the Company to apply for a waiver from the
final compliance date, which, if obtained, could permit the Company to continue
operation of the then remaining Stage 2 aircraft until, at the latest, December
31, 2003.

     ANCA also requires the FAA to establish parameters within which any new
Stage 2 and Stage 3 noise or access restrictions at individual airports must be
developed. The published rules generally provide that local noise restrictions
on Stage 3 aircraft first effective after October 1990 require FAA approval, and
establish a regulatory notice and review process for local restrictions on Stage
2 aircraft first proposed after October 1990. Certain airports, including Dallas
Love Field, Los Angeles, San Diego, San Francisco, and Orange County, have
established airport restrictions to limit noise, including restrictions on
aircraft types to be used and limits on the number of hourly or daily operations
or the time of such operations. In some instances, these restrictions have
caused curtailments in service or increases in operating costs and such
restrictions could limit the ability of Southwest to expand its operations at
the affected airports. Local authorities at other airports are considering
adopting similar noise regulations.

     Operations at John Wayne Airport, Orange County, California, are governed
by the Airport's Phase 2 Commercial Airline Access Plan and Regulation (the
"Plan"). Pursuant to the Plan, each airline is allocated total annual seat
capacity to be operated at the airport, subject to renewal/reallocation on an
annual basis. Service at this airport may be adjusted annually to meet these
requirements.

     The Company is subject to various other federal, state, and local laws and
regulations relating to the protection of the environment, including the
discharge of materials into the environment.

MARKETING AND COMPETITION

      Southwest focuses principally on point-to-point, rather than hub and
spoke, service in shorthaul markets with frequent, conveniently timed flights,
and low fares. For example, Southwest's average aircraft trip length in 1997 was
425 miles with an average duration of approximately one hour. At yearend,
Southwest served 229 one-way nonstop city pairs.

     Southwest's point-to-point route system, as compared to hub and spoke,
provides for more direct nonstop routings for shorthaul customers and,
therefore, minimizes connections, delays, and total trip time. Southwest focuses
on nonstop, not connecting, traffic. As a result, approximately 80 percent of
the Company's Customers fly nonstop. In addition, Southwest serves many
conveniently-located satellite or downtown airports such as Dallas Love Field,
Houston Hobby, Chicago Midway, Baltimore, Burbank, Oakland, San Jose,
Providence, and Ft. Lauderdale airports, which are typically less congested than
other airlines' hub airports and enhance the Company's ability to sustain high
employee productivity and reliable ontime performance. This operating strategy
also permits the Company to achieve high asset utilization. Aircraft are
scheduled to minimize the amount of time the aircraft is at the gate,
approximately 20 minutes, thereby reducing the number of aircraft and gate
facilities that would otherwise be required.

     Southwest does not interline with other domestic jet airlines, nor have any
commuter feeder relationships. However, in late 1996, the Company entered into a
marketing relationship with Icelandair, pursuant to which Icelandair may offer
travel to Customers traveling between Chicago, Cleveland, Louisville or
Providence and various foreign Icelandair destinations, via Baltimore. Southwest
provides the domestic portion of the travel on its regularly scheduled service.

                                        3

<PAGE>   5



     Southwest employs a very simple fare structure, featuring low,
unrestricted, unlimited, everyday coach fares. The Company operates only one
aircraft type, the Boeing 737, which simplifies scheduling, maintenance, flight
operations, and training activities.

     In May 1994, the computer reservations systems (CRSs) owned by United
Airlines (Apollo) and Continental Airlines (System One) disabled automated
ticketing for Southwest travel. Rather than pay the new fees associated with CRS
participation in Apollo and System One, Southwest took the following actions:
Southwest introduced a Ticketless travel option, available system-wide in
January 31, 1995, eliminating the need to print a paper ticket altogether, and
improved access to Ticket By Mail for direct Customers by reducing the time
limit from seven days out from the date of travel to three days. Southwest also
entered into a new arrangement with SABRE, the CRS in which Southwest has
historically participated to a limited extent, providing for ticketing and
automated booking on Southwest in a very cost-effective manner. In 1996,
Southwest began offering Ticketless travel through the Company's home page on
the Internet's World Wide Web at http://www.southwest.com. At December 31, 1997,
approximately 60 percent of Southwest's Customers were choosing the Ticketless
travel option.

     The airline industry is highly competitive as to fares, frequent flyer
benefits, routes, and service, and some carriers competing with the Company have
greater financial resources, larger fleets, and wider name recognition. Several
of the Company's larger competitors have initiated or are studying low-cost,
shorthaul service in markets served by the Company, which represents a more
direct threat in Southwest's market niche. Profit levels in the air transport
industry are highly sensitive to changes in operating and capital costs and the
extent to which competitors match an airline's fares and services. The
profitability of a carrier in the airline industry is also impacted by general
economic trends.

     The Company is also subject to varying degrees of competition from surface
transportation in its shorthaul markets, particularly the private automobile. In
shorthaul air services which compete with surface transportation, price is a
competitive factor, but frequency and convenience of scheduling, facilities,
transportation safety, and Customer Service may be of equal or greater
importance to many passengers.

INSURANCE

     The Company carries insurance of types customary in the airline industry
and at amounts deemed adequate to protect the Company and its property and to
comply both with federal regulations and certain of the Company's credit and
lease agreements. The policies principally provide coverage for public and
passenger liability, property damage, cargo and baggage liability, loss or
damage to aircraft, engines, and spare parts, and workers' compensation.

FREQUENT FLYER AWARDS

     Southwest's frequent flyer program, Rapid Rewards, is based on trips flown
rather than mileage. Rapid Rewards offers two types of travel awards. The Rapid
Rewards Award Ticket ("Award Ticket") offers one free roundtrip travel award to
any Southwest destination after flying eight roundtrips (or 16 one-way trips) on
Southwest within a consecutive twelve-month period. The Rapid Rewards Companion
Pass ("Companion Pass") is granted after flying 50 roundtrips (or 100 one-way
trips) on Southwest within a consecutive twelve-month period. The Companion Pass
offers unlimited free roundtrip travel to any Southwest destination for a
companion of the qualifying Rapid Rewards member. In order for the companion to
use this pass, the Rapid Rewards member must purchase a ticket or use an Award
Ticket. Additionally, the Rapid Rewards member and companion must travel
together on the same flight.


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     The trips flown as credit towards a free travel award are valid for twelve
months only; the free travel awards are automatically generated when earned by
the Customer rather than allowing the Customer to bank the trip credits
indefinitely; and the free travel awards are valid for one year with an
automatic expiration date. Based on the issuance of free travel awards to
qualified members, coupled with the foregoing program characteristics and the
use of "black out" dates for the free travel awards during peak holiday periods,
the financial impact of free travel awards used on the Company's consolidated
financial statements has not been material. Free travel awards redeemed were
approximately 782,000, 494,000, and 435,000 during 1997, 1996, and 1995,
respectively. The amount of free travel award usage as a percentage of total
Southwest revenue passengers carried was 3.1 percent in 1997, 2.0 percent in
1996, and 1.9 percent in 1995.

     The Company accounts for free travel awards using the incremental cost
method, consistent with the other major airlines. This method recognizes an
average incremental cost to provide roundtrip transportation to one additional
passenger. The incremental cost to provide free transportation is accrued at the
time an award is earned and revenue is subsequently recognized, at the amount
accrued, when the free travel award is used. The estimated incremental costs
include passenger costs such as beverage and snack supplies, baggage claims,
baggage handling, and liability insurance; operations costs such as security
services, airport rentals, fuel, oil, and into-plane charges; and reservations
costs, such as communications and system operations fees. The liability for free
travel awards earned but not used at December 31, 1997 and 1996 was not
material.

     The number of Award Tickets for Southwest outstanding at December 31, 1997
and 1996 was approximately 485,000 and 399,000, respectively. These numbers do
not include partially earned Award Tickets. The Company currently does not have
a system to accurately estimate partially earned Award Tickets. However, these
partially earned Award Tickets may equate to approximately 60-70 percent of the
current outstanding Award Tickets. Since the inception of Rapid Rewards in 1987,
approximately 15 percent of all Award Tickets have expired without being used.

     The number of Companion Passes for Southwest outstanding at December 31,
1997 and 1996 was approximately 20,000 and 30,000, respectively. The Company
currently estimates that three to four trips will be redeemed per outstanding
Companion Pass.

EMPLOYEES

     At December 31, 1997, Southwest had 23,974 active employees, consisting of
6,459 flight, 1,116 maintenance, 13,723 ground customer service and 2,676
management, accounting, marketing, and clerical personnel.

     Southwest has ten collective bargaining agreements covering approximately
84 percent of its employees. Southwest's Customer service and Reservation
employees are subject to an agreement with the International Association of
Machinists and Aerospace Workers, AFL-CIO (IAM), which became amendable in
November 1997 and is currently in negotiations. Flight attendants are subject to
an agreement with the Transportation Workers Union of America, AFL-CIO (TWU),
which becomes amendable May 31, 2002. Fleet service employees are subject to an
agreement with the TWU which becomes amendable in December 1999. The pilots are
subject to an agreement with the Southwest Airlines Pilots' Association (SWAPA),
which becomes amendable in September 1999 (described below). Flight dispatchers
are represented by the Southwest Airlines Employees Association, pursuant to an
agreement which became amendable in November 1997 and is currently in
negotiations. Aircraft cleaners and stock clerks; mechanics, flight simulator
technicians and flight crew training instructors are represented by the
International Brotherhood of Teamsters pursuant to separate agreements which
become amendable in August 2000, August 2001, October 2000 and December 2000,
respectively. The flight/ground school

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instructors are subject to an agreement with the Southwest Airlines Professional
Instructors Association, which becomes amendable in December 2000.

     In January 1995, Southwest's pilots ratified a ten-year labor contract that
calls for no wage increases in the first five years and three percent annual
wage increases in three of the last five years of the contract. Initially, the
pilots received options to purchase approximately 21.8 million shares of
Southwest common stock at $13.33 per share over the term of the contract. Pilots
hired subsequently receive additional grants at a five percent premium over the
then current fair market value. Up to 27,000,000 shares ultimately can be issued
under the stock option plan. Pilots are eligible for profitability bonuses of up
to three percent of compensation in three of the first five years and
profitability-based pay increases up to three percent in two of the second five
years of the contract. The pilot group may choose to reopen the contract after
five years, in which event all unexercised options will terminate on December 1,
1999.

ITEM 2. PROPERTIES

AIRCRAFT

     Southwest operated a total of 261 Boeing 737 aircraft as of December 31,
1997, of which 106 and 13 were under operating and capital leases, respectively.
The remaining 142 aircraft were owned.

     Southwest is the launch customer for the Boeing 737-700 aircraft, the
newest generation of the Boeing 737 aircraft type. The first 737-700 Aircraft
was delivered in December 1997 and entered revenue service in January 1998.

     In total, at December 31, 1997, the Company had 126 firm orders to purchase
Boeing 737 Aircraft as follows:

<TABLE>
<CAPTION>
        Type        Seats   1998   1999   2000   2001   2002   2003   2004
        ----        -----   ----   ----   ----   ----   ----   ----   ----
<S>     <C>         <C>     <C>    <C>    <C>    <C>    <C>     <C>    <C>
        737-700       137     22     25     23     21     21      8      6
</TABLE>

     The Company also has 62 options for deliveries in 2003 through 2006.

     The average age of the Company's fleet at December 31, 1997 was 8.3 years.

     The Company has an agreement with CFM International, Inc. (CFM) (a joint
company of SNECMA (France) and General Electric Company) dated May 28, 1981, as
amended, for the supply of spare engines for its Boeing 737-300, -500, and -700
aircraft. CFM also supplies the engines to The Boeing Company for original
installation on such aircraft. CFM is the sole manufacturer of engines for use
on the Boeing 737-300, -500, and -700 aircraft.

GROUND FACILITIES AND SERVICES

     Southwest leases terminal passenger service facilities at each of the
airports it serves to which it has added various leasehold improvements. The
Company leases land on a long-term basis for its maintenance centers located at
Dallas Love Field, Houston Hobby, and Phoenix Sky Harbor, its training center
near Love Field which houses five 737 simulators, and its corporate headquarters
also located near Love Field. The maintenance, training center, and corporate
headquarters buildings on these sites were built and are owned by Southwest. At
December 31, 1997, the Company operated nine reservation centers. The
reservation centers located in Little Rock, Arkansas; Chicago, Illinois;
Albuquerque, New Mexico; and Oklahoma City, Oklahoma occupy leased space. The
Company owns its Dallas, Texas; Houston, Texas; Phoenix, Arizona; Salt Lake
City, Utah; and San Antonio, Texas reservation centers.

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     The Company performs substantially all line maintenance on its aircraft and
provides ground support services at most of the airports it serves. However, the
Company has arrangements with certain aircraft maintenance firms for major
component overhauls and repairs for its airframes and engines, which comprise
the majority of the annual maintenance costs.

     In recent years, many airports have increased or sought to increase the
rates charged to airlines. The extent to which such charges are limited by
statute and the ability of airlines to contest such charges has been subject to
litigation and to administrative proceedings before the Department of
Transportation. To the extent the limitations on such charges are relaxed or the
ability of airlines to challenge such charges is restricted, the rates charged
by airports to airlines may increase substantially. Management cannot predict
the magnitude of any such increase.

ITEM 3.  LEGAL PROCEEDINGS

     The Company received a statutory notice of deficiency from the Internal
Revenue Service (the "IRS") in which the IRS proposed to disallow deductions
claimed by the Company on its federal income tax returns for the taxable years
1989 through 1991 for the costs of certain aircraft inspection and maintenance
procedures. The IRS has proposed similar adjustments to the tax returns of
numerous other members of the airline industry. In response to the statutory
notice of deficiency, the Company filed a petition in the United States Tax
Court on October 30, 1997, seeking a determination that the IRS erred in
disallowing the deductions claimed by the Company and that there is no
deficiency in the Company's tax liability for the taxable years in issue. It is
expected that the Tax Court's decision will not be entered for several years.
Management believes that the final resolution of this controversy will not have
a materially adverse effect upon the financial condition or results of
operations of the Company. This forward-looking statement is based on
management's current understanding of the relevant law and facts; it is subject
to various contingencies including the views of legal counsel, changes in the
IRS' position, the potential cost and risk associated with litigation and the
actions of the IRS, judges, and juries.

ITEM 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

     None to be reported.



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<PAGE>   9



                      EXECUTIVE OFFICERS OF THE REGISTRANT

     The executive officers of Southwest, their positions, and their respective
ages (as of March 1, 1998) are as follows:

<TABLE>
<CAPTION>
                                                                                               OFFICER
                                                                                             CONTINUOUSLY
        NAME                            POSITION                                AGE             SINCE
        ----                            --------                                ---          ------------
<S>                             <C>                                             <C>          <C> 
Herbert D. Kelleher             Chairman of the Board, President,               66             1967
                                 and Chief Executive Officer

Colleen C. Barrett              Executive Vice President-Customers              53             1978
                                 and Corporate Secretary

Gary A. Barron                  Executive Vice President,                       53             1978
                                 Chief Operations Officer

John G. Denison                 Executive Vice President-                       53             1986
                                 Corporate Services

Gary C. Kelly                   Vice President-Finance,                         42             1986
                                 Chief Financial Officer

James F. Parker                 Vice President-General Counsel                  51             1986

Ron Ricks                       Vice President-Governmental Affairs             48             1986

Joyce C. Rogge                  Vice President - Advertising and Promotions     40             1994

James C. Wimberly               Vice President-Ground Operations                45             1985
</TABLE>


     Executive officers are elected annually at the first meeting of Southwest's
Board of Directors following the annual meeting of shareholders or appointed by
the President pursuant to Board authorization.

SECTION 16(a) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

     Due to a clerical error, Colleen C. Barrett, Executive Vice President -
Customers and Corporate Secretary filed a Form 4, reporting an exercise of
employee stock options, which was one week late.

                                        8

<PAGE>   10




                                     PART II

ITEM 5.  MARKET FOR THE REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER
         MATTERS

     Southwest's common stock is listed on the New York Stock Exchange and is
traded under the symbol LUV. The high and low sales prices of the common stock
on the Composite Tape and the quarterly dividends per share paid on the common
stock were:

<TABLE>
<CAPTION>
     PERIOD                     DIVIDEND       HIGH       LOW
     ------                     --------       ----       ---
<S>             <C>             <C>           <C>        <C>   
        1997
                1st Quarter     $.00770       $16.67     $14.17
                2nd Quarter      .00770        18.67      14.33
                3rd Quarter      .00770        22.13      17.33
                4th Quarter      .01000        26.25      18.83

        1996
                1st Quarter     $.00733       $22.00     $14.75
                2nd Quarter      .00733        22.17      17.17
                3rd Quarter      .00733        19.33      14.25
                4th Quarter      .00733        17.33      13.75
</TABLE>

        As of March 2, 1998, there were 9,141 holders of record of the Company's
common stock.

RECENT SALES OF UNREGISTERED SECURITIES

        During 1997, Herbert D. Kelleher, President and Chief Executive Officer,
exercised unregistered options to purchase Southwest Common Stock as follows
(the numbers have not been adjusted for the subsequent stock split):


<TABLE>
<CAPTION>
    Number of Shares Purchased                Exercise Price                     Date of Exercise
    --------------------------                --------------                     ----------------
<S>                                           <C>                                <C>
              123,750                              $1.00                             01/14/97
               33,750                              4.889                             01/14/97
</TABLE>

        The issuance of the above options and shares to Mr. Kelleher were deemed
exempt from the registration provisions of the Securities Act of 1933, as
amended (the "Act"), by reason of the provision of Section 4(2) of the Act
because, among other things, of the limited number of participants in such
transactions and the agreement and representation of Mr. Kelleher that he was
acquiring such securities for investment and not with a view to distribution
thereof. The certificates representing the shares issued to Mr. Kelleher contain
a legend to the effect that such shares are not registered under the Act and may
not be transferred except pursuant to a registration statement which has become
effective under the Act or to an exemption from such registration. The issuance
of such shares was not underwritten.

ITEM 6.  SELECTED FINANCIAL DATA

        The following financial information for each of the five years ended
December 31, 1997 has been derived from the Company's consolidated financial
statements. This information should be read in conjunction with the Consolidated
Financial Statements and related notes thereto included elsewhere herein.

                                        9

<PAGE>   11





<TABLE>
<CAPTION>
                                                                        YEARS ENDED DECEMBER 31,
                                                                        ------------------------
                                                   1997            1996            1995            1994            1993
                                                -----------     -----------     -----------     -----------     -----------
<S>                                             <C>             <C>             <C>             <C>             <C>        
FINANCIAL DATA:
   (in thousands except per share amounts)
   Operating revenues .......................   $ 3,816,821     $ 3,406,170     $ 2,872,751     $ 2,591,933     $ 2,296,673
   Operating expenses .......................     3,292,585       3,055,335       2,559,220       2,275,224       2,004,700
                                                -----------     -----------     -----------     -----------     -----------
   Operating income .........................       524,236         350,835         313,531         316,709         291,973
   Other expenses, net ......................         7,280           9,473           8,391          17,186          32,336
                                                -----------     -----------     -----------     -----------     -----------
   Income before income taxes and cumula-
      tive effect of accounting changes .....       516,956         341,362         305,140         299,523         259,637
   Provision for income taxes ...............       199,184         134,025         122,514         120,192         105,353
                                                -----------     -----------     -----------     -----------     -----------
   Income before cumulative effect of
             accounting changes .............       317,772         207,337         182,626         179,331         154,284
   Cumulative effect of accounting changes               --              --              --              --          15,259 (2)
                                                -----------     -----------     -----------     -----------     -----------
   Net income ...............................   $   317,772     $   207,337     $   182,626     $   179,331     $   169,543
                                                ===========     ===========     ===========     ===========     ===========

   Net income per share, basic(1) ...........   $      1.45     $       .95     $       .85     $       .84     $       .72 (3)
   Net income per share, diluted(1) .........   $      1.40     $       .92     $       .82     $       .82     $       .70 (3)
   Cash dividends per common share(1) .......   $     .0331     $    .02932     $    .02667     $    .02667     $    .02578
   Total assets at period-end ...............   $ 4,246,160     $ 3,723,479     $ 3,256,122     $ 2,823,071     $ 2,576,037
   Long-term obligations at period-end ......   $   628,106     $   650,226     $   661,010     $   583,071     $   639,136
   Stockholders' equity at period-end .......   $ 2,009,018     $ 1,648,312     $ 1,427,318     $ 1,238,706     $ 1,054,019
OPERATING DATA:
   Revenue passengers carried ...............    50,399,960      49,621,504      44,785,573      42,742,602 (5)  36,955,221 (5)
   Revenue passenger miles (RPMs) (000s) ....    28,355,169      27,083,483      23,327,804      21,611,266      18,827,288
   Available seat miles (ASMs) (000s) .......    44,487,496      40,727,495      36,180,001      32,123,974      27,511,000
   Load factor ..............................          63.7%           66.5%           64.5%           67.3%           68.4%
   Average length of passenger haul (miles)..           563             546             521             506             509
   Trips flown ..............................       786,288         748,634         685,524         624,476         546,297
   Average passenger fare ...................   $     72.21     $     65.88     $     61.64     $     58.44     $     59.97
   Passenger revenue yield per RPM ..........         12.84 c.        12.07 c.        11.83 c.        11.56 c.        11.77 c. 
   Operating revenue yield per ASM ..........          8.58 c.         8.36 c.         7.94 c.         8.07 c.         8.35 c. 
   Operating expenses per ASM ...............          7.40 c.         7.50 c.         7.07 c.         7.08 c.         7.25 c.(6)
   Fuel cost per gallon (average) ...........         62.46 c.        65.47 c.        55.22 c.        53.92 c.        59.15 c. 
   Number of employees at year end ..........        23,974          22,944          19,933          16,818          15,175
   Size of fleet at year end (4) ............           261             243             224             199             178
</TABLE>


- ------------------
(1) On September 25, 1997 the Company's Board of Directors declared a
    three-for-two stock split on the Company's Common Stock, distributed on
    November 26, 1997. Except as specifically noted elsewhere, all share and per
    share data in this annual report have been restated to give effect to the
    stock split. Net income per share data has been restated in accordance with
    Statement of Financial Accounting Standards No. 128, Earnings per Share.

(2) Includes the net cumulative effect of adopting Statement of Financial
    Accounting Standards No. 109, Accounting for Income Taxes and Statement of
    Financial Accounting Standards No. 106, Employers' Accounting for
    Postretirement Benefits Other than Pensions.

(3) Before cumulative effect of accounting change.

(4) Includes leased aircraft.

(5) Includes certain estimates for Morris.

(6) Excludes merger expenses of $10.8 million.

                                       10

<PAGE>   12
ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
        OF OPERATIONS


YEAR IN REVIEW

In 1997, Southwest posted a record annual profit for the sixth consecutive year
and a profit for the 25th consecutive year. Net income for 1997 benefited from
record passenger revenue yields and continued cost control, widening our
industry-leading cost advantage.

At the end of 1997, Southwest served 51 cities in 25 states. We added service to
Jacksonville, Florida and Jackson, Mississippi in 1997 and have been very
pleased with the results, thus far. We also expanded our existing service to
certain cities in 1997, especially Nashville, Providence, and our Florida
markets. Plans for 1998 include the addition of 14 more aircraft, net, and
service to two new cities. We will continue to add additional flights to cities
we already serve. Any further expansion in 1998 will be dependent upon
additional aircraft availability.

We were the launch customer for the new Boeing 737-700 aircraft, taking our
first delivery in December 1997. The -700 is expected to contribute to our low
cost advantage as it is more fuel efficient, less maintenance intensive, and has
a lower capital outlay than the -300. We added 18 new Boeing 737s to our fleet
in 1997: 15 -300s and three -700s. In 1998, we are currently scheduled to
receive 22 -700s and retire eight older -200s (three in first quarter 1998; one
in second quarter 1998; and four in fourth quarter 1998). We currently are
interested in adding more 737 aircraft in 1998 if we can find aircraft at
reasonable prices.

At the present time, Boeing is experiencing production delays related to the 737
production line. Thus far, these delays have not had a significant impact on our
operations as we were able to defer the retirement of some older -200s and have
earned cash penalty payments from Boeing. Boeing currently expects delays to
continue in 1998, which temporarily delays our expansion. Boeing will continue
to compensate Southwest for these production delays.

                                       11
<PAGE>   13


In August 1997, the Taxpayer Relief Act of 1997 was enacted, which included,
among other things, a revision of the then current ten percent federal excise
tax on domestic tickets. Effective October 1, 1997, through September 30, 1998,
the tax rate was reduced to nine percent of the amount paid for transportation
beginning on or after October 1, 1997, and a new $1.00 flight segment tax was
imposed. From October 1, 1998 to September 30, 1999, the tax rate will decrease
to eight percent and the segment tax will increase to $2.00. Beginning October
1, 1999, the tax rate will change to 7.5 percent of the ticket price. The
segment tax will increase to $2.25 from October 1, 1999 to December 31, 1999;
$2.50 during 2000; $2.75 during 2001; and $3.00 per segment during 2002.
Thereafter, the $3.00 segment tax will be indexed to changes in the Consumer
Price Index (CPI). The legislation also included a new tax on the sale of
frequent flier miles, raised the international departure fee, and instituted a
new international arrival fee.

Management estimates these changes may increase Southwest's tax burden by
roughly $30 million in 1998 as the effect of the new tax is to shift an
increasing portion of the excise tax burden to low fare, shorthaul carriers such
as Southwest. Effective October 1, 1997, the Company raised fares to offset the
increased excise taxes. While the fare increases mitigated the additional tax
burden in fourth quarter 1997, management cannot accurately predict the future
effects of tax or fare increases. (This paragraph contains forward-looking
statements which involve uncertainties that could result in actual results
differing materially from expected results. Some significant factors include,
but may not be limited to, regulations implementing the tax, competitors'
responses to the tax, and the ability to pass through the tax in the form of
fare increases.)

On October 27, 1997, the International Air Transportation Competition Act of
1979 was amended to allow scheduled service from Dallas Love Field to Alabama,
Mississippi, and Kansas. The Company now offers scheduled service from Dallas
Love Field to Jackson via connecting flights through Houston and service from
Dallas Love Field to Birmingham via connecting flights through New Orleans and
Houston. No additional flights have been added, thus far, from Dallas Love Field
to Alabama, Mississippi, or Kansas.

                                       12
<PAGE>   14
RESULTS OF OPERATIONS

1997 COMPARED WITH 1996 The Company's consolidated net income for 1997 was
$317.8 million ($1.40 per share, diluted), as compared to the corresponding 1996
amount of $207.3 million ($.92 per share, diluted), an increase of 53.3 percent.
The prior years' earnings per share amounts have been restated for the 1997
three-for-two stock split (see Note 6 to the Consolidated Financial Statements).

OPERATING REVENUES Consolidated operating revenues increased by 12.1 percent in
1997 to $3,816.8 million, compared to $3,406.2 million for 1996. This increase
in 1997 operating revenues was derived primarily from an 11.3 percent increase
in passenger revenues as a result of a 4.7 percent increase in revenue passenger
miles (RPMs) and a 6.4 percent increase in passenger revenue yield per RPM.
Southwest's passenger revenues benefited from a strong U.S. economy, strong
demand for air travel, increased fares, and a favorable mix of higher yielding
fares.

The 4.7 percent increase in RPMs in 1997, coupled with a 9.2 percent increase in
available seat miles (ASMs), resulted in a decrease in load factor from 66.5
percent in 1996 to 63.7 percent in 1997. The decrease in load factor was
primarily the result of less promotional fare activity in 1997. The 1997 ASM
growth resulted from the addition of 18 aircraft during the year.

The January 1998 load factor decreased to 54.0 percent from 60.2 percent in
January 1997 due to heavy promotional fare activities in the 1997 period.
However, revenue yield per passenger mile continues to be strong in January 1998
despite difficult comparisons due to the lapse of the federal excise tax from
January 1 to March 7, 1997. Comparisons in February and March will be more
difficult due to fare increases in February 1997. (The immediately preceding
sentence is a forward-looking statement which involves uncertainties that could
result in actual results differing materially from expected results. Some
significant factors include, but may not be limited to, competitive pressure
such as fare sales and capacity changes by other carriers, general economic
conditions, and variations in advance booking trends.)

Freight revenues in 1997 were $94.8 million, compared to $80.0 million in 1996.
The 18.4 percent increase in freight revenues exceeded the 9.2 percent increase
in ASMs for the same period primarily due to an increase in United States mail
services and

                                       13
<PAGE>   15

increased air freight volumes resulting, in part, from the United Parcel Service
labor strike during third quarter 1997.

Other revenues increased by 45.6 percent in 1997 to $82.9 million, compared to
$56.9 million in 1996. This increase is primarily due to the sale of frequent
flyer segment credits to participating partners in the Company's Rapid Rewards
frequent flyer program.

OPERATING EXPENSES Consolidated operating expenses for 1997 were $3,292.6
million, compared to $3,055.3 million in 1996, an increase of 7.8 percent,
compared to the 9.2 percent increase in capacity. Operating expenses per ASM
decreased 1.3 percent in 1997, compared to 1996, primarily due to lower jet fuel
prices; lower aircraft engine repair costs; and favorable results from numerous
Companywide cost reduction efforts.

Unit costs are expected to benefit in first quarter 1998, versus first quarter
1997, from lower jet fuel prices. Excluding jet fuel costs, operating expenses
per ASM are expected to increase primarily due to higher maintenance costs as
management believes first quarter 1998 maintenance unit costs will be higher
than the same period in 1997 due to an unusually low number of aircraft engine
overhauls performed in first quarter 1997. (The immediately preceding two
sentences are forward-looking statements which involve uncertainties that could
result in actual results differing materially from expected results. Such
uncertainties include, but may not be limited to, the largely unpredictable
levels of jet fuel prices.)

Operating expenses per ASM for 1997 and 1996 were as follows:

OPERATING EXPENSES PER ASM

<TABLE>
<CAPTION>
                                                                          INCREASE    PERCENT
                                                    1997        1996     (DECREASE)    CHANGE
                                                    ----        ----     ----------    ------
<S>                                                 <C>         <C>      <C>          <C> 
Salaries, wages, and benefits ...............       2.26 c.     2.22 c.     .04 c.       1.8%
Employee profitsharing and savings plans ....        .30         .23         .07        30.4
Fuel and oil ................................       1.11        1.19        (.08)       (6.7)
Maintenance materials and repairs ...........        .58         .62        (.04)       (6.5)
Agency commissions ..........................        .35         .35          --          --
Aircraft rentals ............................        .45         .47        (.02)       (4.3)
Landing fees and other rentals ..............        .46         .46          --          --
Depreciation ................................        .44         .45        (.01)       (2.2)
Other .......................................       1.45        1.51        (.06)       (4.0)
                                                    ----        ----        ----        ---- 

TOTAL .......................................       7.40 c.     7.50 c.     (.10) c.    (1.3)%
                                                    ----        ----        ----        ----  
</TABLE>

                                       14
<PAGE>   16

Salaries, wages, and benefits per ASM increased 1.8 percent in 1997. This
increase resulted primarily from a 2.4 percent increase in 1997 average salary
and benefits cost per Employee, partially offset by slower growth in the number
of Employees. The increase in average salary and benefits cost per Employee
primarily is due to increased health care costs.

The Company's Flight Attendants are subject to an agreement with the Transport
Workers Union of America, AFL-CIO (TWU), which became amendable May 31, 1996.
The Company reached an agreement with the TWU, which was ratified by its
membership in December 1997. The new contract becomes amendable in May 2002.

The Company's Customer Service and Reservations Sales Agents are subject to an
agreement with the International Association of Machinists and Aerospace
Workers, AFL-CIO (IAM), which became amendable in November 1997 and is currently
under negotiation. Flight Dispatchers are represented by the Southwest Airlines
Employees Association, pursuant to an agreement which became amendable in
November 1997 and is also currently under negotiation.

Profitsharing and Employee savings plans expense per ASM increased 30.4 percent
in 1997, primarily due to higher earnings available for profitsharing.

Fuel and oil expenses per ASM decreased 6.7 percent in 1997, primarily due to a
4.6 percent decrease from 1996 in the average jet fuel cost per gallon, coupled
with a slight decrease in the average fuel burn rate from 1996. The average
price paid for jet fuel in 1997 was $.6246 compared to $.6547 in 1996. During
fourth quarter 1997, the average cost per gallon decreased 17.5 percent to
$.6040 compared to $.7323 in fourth quarter 1996. In January 1998, fuel prices
averaged approximately $.53 per gallon.

Maintenance materials and repairs per ASM decreased 6.5 percent in 1997,
compared to 1996, primarily as a result of lower engine

                                       15
<PAGE>   17

overhaul costs in the first three quarters of 1997, when compared to the same
periods in 1996.

On August 1, 1997, the Company signed a ten-year engine maintenance contract
with General Electric Engine Services, Inc. (General Electric). Under the terms
of the contract, Southwest will pay General Electric a rate per flight hour in
exchange for General Electric performing substantially all engine maintenance
for the CFM56-3 engines on the 737-300 and 737-500 aircraft. The Company has a
similar agreement with General Electric with respect to the engines on the
737-700 aircraft. Maintenance on the Pratt & Whitney JT8-D engines on the
737-200 aircraft will continue to be performed by General Electric on a time and
materials basis. By consolidating its engine repair work and committing to ten
years, Southwest believes it will spend substantially less over the course of
the contract versus what it would have spent absent this new agreement. (The
immediately preceding sentence is a forward-looking statement which involves
uncertainties that could result in actual results differing materially from
expected results; such uncertainties include the number of unscheduled engine
removals, labor rates, and competition in the engine overhaul market.)

Agency commissions per ASM remained unchanged in 1997, when compared to 1996, as
the mix of commissionable sales was relatively unchanged.

Aircraft rentals per ASM decreased 4.3 percent in 1997, compared to 1996,
primarily due to a lower percentage of the aircraft fleet being leased.

Depreciation expense per ASM decreased 2.2 percent in 1997, compared to 1996,
due to an increase in the average life of depreciable assets.

Other operating expenses per ASM decreased 4.0 percent in 1997, compared to
1996, primarily due to lower credit card processing costs, insurance rates,
passenger costs, communications costs, and favorable results from numerous other
Companywide cost reduction efforts.

OTHER "Other expenses (income)" included interest expense, capitalized interest,
interest income, and nonoperating gains and losses. Interest expense increased
$4.2 million in 1997 primarily due to the February 1997 issuance of $100 million
of

                                       16
<PAGE>   18

senior unsecured 7 3/8% Debentures due March 1, 2027. Capitalized interest
decreased $2.5 million in 1997 as a result of the timing of payments related to
aircraft purchase contracts. Interest income for 1997 increased $10.8 million
primarily due to higher invested cash balances.

INCOME TAXES The provision for income taxes, as a percentage of income before
taxes, decreased in 1997 to 38.5 percent from 39.3 percent in 1996. The decrease
resulted from lower effective state tax rates, including a reduced California
income tax rate.

1996 COMPARED WITH 1995 The Company's consolidated net income for 1996 was
$207.3 million ($.92 per share, diluted), as compared to the corresponding 1995
amount of $182.6 million ($.82 per share, diluted), an increase of 13.5 percent.

OPERATING REVENUES Consolidated operating revenues increased by 18.6 percent in
1996 to $3,406.2 million, compared to $2,872.8 million for 1995. This increase
in 1996 operating revenues was derived primarily from an 18.4 percent increase
in passenger revenues. RPMs increased 16.1 percent in 1996, compared to a 12.6
percent increase in ASMs, resulting in an increase in load factor from 64.5
percent in 1995 to 66.5 percent in 1996. The 1996 ASM growth resulted from the
net addition of 19 aircraft during the year: 22 additions and three retirements.

In December 1995, because of the impasse in the federal budget, Congress allowed
the ten percent federal excise tax to lapse. This benefited Southwest's revenues
until late August 1996 when Congress reimposed the tax through December 31,
1996. The reimposition of the excise tax negatively impacted revenue trends in
third and fourth quarters 1996, as compared to revenue trends in the first half
of 1996.

In celebration of the Company's 25th Anniversary, Southwest launched a fare sale
in July 1996 for travel between August 19 and October 31, 1996. The sale was
extremely popular and resulted in record advance bookings, with more than four
and a half million seats sold. Although July and early August load factors and
revenues were negatively impacted by telephone line congestion experienced
during the sale, revenues for September and October 1996 were positively
impacted with very heavy passenger volumes.

                                       17
<PAGE>   19

Freight revenues in 1996 were $80.0 million, compared to $65.8 million in 1995.
The 21.5 percent increase in freight revenues exceeded the 12.6 percent increase
in ASMs for the same period primarily due to increased air freight volumes and
United States mail services.

Other revenues increased by 23.3 percent in 1996 to $56.9 million, compared to
$46.2 million in 1995. This increase primarily was due to increased charter
revenue.

OPERATING EXPENSES Consolidated operating expenses for 1996 were $3,055.3
million, compared to $2,559.2 million in 1995, an increase of 19.4 percent,
compared to the 12.6 percent increase in capacity. Operating expenses per ASM
increased 6.1 percent in 1996 compared to 1995, primarily due to significantly
higher jet fuel prices along with a 4.3 cent per gallon federal jet fuel tax
implemented October 1, 1995. Excluding jet fuel costs and related taxes,
operating expenses per ASM were up 3.1 percent in 1996 compared to 1995.

Salaries, wages, and benefits per ASM increased 2.3 percent in 1996. This
increase resulted primarily from a 16.2 percent increase in 1996 average
headcount, which outpaced the 1996 capacity (ASM) increase of 12.6 percent, and
offset a .8 percent decrease in average salary and benefits cost per Employee.
The 16.2 percent increase in average headcount primarily was the result of a
24.3 percent increase in Reservations Sales Agents in 1996. Excluding
Reservations Sales Agents, total average headcount increased 13.1 percent, in
line with capacity.

Fuel and oil expenses per ASM increased 17.8 percent in 1996, primarily due to
an 18.6 percent increase in the average jet fuel cost per gallon from 1995. The
average price paid for jet fuel in 1996 was $.6547 compared to $.5522 in 1995.
During fourth quarter 1996, the average cost per gallon increased 25.0 percent
to $.7323 compared to $.5859 in fourth quarter 1995.

Maintenance materials and repairs per ASM increased 3.3 percent in 1996,
compared to 1995, primarily as a result of increased scheduled airframe
inspections during 1996.

Agency commissions per ASM increased 2.9 percent in 1996, compared to 1995,
which was slightly slower than the 5.2 percent increase in passenger revenues
per ASM.

                                       18
<PAGE>   20

Landing fees and other rentals per ASM increased 4.5 percent in 1996, compared
to 1995, which included an airport credit of $4.9 million.

Depreciation expense per ASM increased 4.7 percent in 1996, compared to 1995,
due to an increase in the percentage of owned aircraft.

Other operating expenses per ASM increased 9.4 percent in 1996, compared to
1995. This increase was primarily due to increased advertising costs resulting
from the expansion into Florida and Providence, Rhode Island, as well as a new
advertising campaign; the 4.3 cent per gallon tax on commercial aviation jet
fuel purchased for use in domestic operations, which became effective October 1,
1995; and increased airport security costs. The additional fuel tax increased
1996 and 1995 "other operating expenses" by $32.7 million and $7.4 million,
respectively.

OTHER "Other expenses (income)" included interest expense, capitalized interest,
interest income, and nonoperating gains and losses. Capitalized interest
decreased $9.1 million in 1996 as a result of certain amendments to aircraft
purchase contracts during third quarter 1995 that affected the timing of
payments. Interest income for 1996 increased $5.7 million primarily due to
higher invested cash balances.

INCOME TAXES The provision for income taxes, as a percentage of income before
taxes, decreased in 1996 to 39.3 percent from 40.2 percent in 1995. The decrease
primarily was the result of lower effective state tax rates.

LIQUIDITY AND CAPITAL RESOURCES

Cash provided from operations was $610.6 million in 1997, compared to $615.2
million in 1996. (Operating cash flows in 1996 were inflated by $79.4 million
due to a one-time deferral allowed by the federal government for payment of
excise taxes. On a pro forma basis, operating cash flows would have been $690.0
million in 1997 versus $535.8 million in 1996.)

During 1997, additional funds of $98.8 million were generated from the February
issuance of $100 million of senior unsecured 7 3/8% Debentures due March 1,
2027. These proceeds primarily were used to finance aircraft-related capital
expenditures and to provide working capital.

                                       19
<PAGE>   21

During 1997, capital expenditures of $688.9 million primarily were for the
purchase of 15 new 737-300 aircraft and three new 737-700 aircraft along with
progress payments for future aircraft deliveries. At December 31, 1997, capital
commitments of the Company primarily consisted of scheduled aircraft
acquisitions and related flight equipment.

As of December 31, 1997, Southwest had 126 new 737-700s on firm order, including
22 to be delivered in 1998, with options to purchase another 62. Aggregate
funding required for firm commitments approximated $3,109.8 million through the
year 2004, of which $565.7 million related to 1998. See Note 2 to the
Consolidated Financial Statements for further information.

As of December 31, 1997, the Company had authority from its Board of Directors
to purchase up to 2,500,000 shares of its common stock from time to time on the
open market. No shares have been purchased since 1990.

The Company has various options available to meet its capital and operating
commitments, including cash on hand at December 31, 1997, of $623.3 million,
internally generated funds, and a revolving credit line with a group of banks of
up to $475 million (none of which had been drawn at December 31, 1997). In
addition, the Company will also consider various borrowing or leasing options to
maximize earnings and supplement cash requirements.

The Company currently has outstanding shelf registrations for the issuance of
$414.4 million of public debt securities, which it currently intends to utilize
for aircraft financings in 1998 and 1999.

MARKET RISK

In 1997, the Securities and Exchange Commission issued new rules (Item 305 of
Regulation S-K), which require disclosure of material risks, as defined in Item
305, related to market risk sensitive financial instruments. As defined,
Southwest currently has market risk sensitive instruments related to jet fuel
prices and interest rates.

Airline operators are inherently dependent upon energy to operate and,
therefore, are impacted by changes in jet fuel prices. Jet fuel consumed in 1997
represented approximately 15.0 percent of

                                       20
<PAGE>   22

Southwest's operating expenses. Southwest endeavors to acquire jet fuel at the
lowest prevailing prices possible.

The Company hedges its exposure to jet fuel price market risk only on a
conservative, limited basis. The fair value of outstanding derivative commodity
instruments (primarily purchased crude oil call options) related to the
Company's jet fuel price market risk during 1997 and at December 31, 1997 was
immaterial. For further discussion, see Note 1 to the Consolidated Financial
Statements.

Airline operators are also inherently capital intensive, as the vast majority of
the Company's assets are aircraft, which are long lived. The Company's strategy
is to capitalize itself conservatively and grow capacity steadily and
profitably. While Southwest does use financial leverage, it has maintained a
strong balance sheet and "A-" or equivalent credit ratings on its senior
unsecured debt with three rating agencies (Standard & Poor's, Moody's, and Duff
& Phelps).

As disclosed in Note 4 to the Consolidated Financial Statements, the Company has
outstanding unsecured debt of $600 million at December 31, 1997, of which only
$500 million is long-term. This long-term debt represents only 14.5 percent of
total noncurrent assets at December 31, 1997. The Company has an average   
maturity of 11 years for the long-term debt at fixed rates averaging 7.8
percent, which is below average rates prevailing over the last ten years.

At December 31, 1997, the Company operated 119 aircraft under operating and
capital leases at rates that are substantially fixed. As defined in Item 305,
leases are not market risk sensitive financial instruments and, therefore, are
not included in the interest rate sensitivity analysis below. Commitments
related to leases are disclosed in Note 5 to the Consolidated Financial
Statements.

The Company does not have significant exposure to changing interest rates on its
long-term debt because the interest rates are fixed and the financial leverage
is modest. Additionally, the Company does not have significant exposure to
changing interest rates on invested cash, which was $623 million at December 31,
1997. The Company invests available cash in certificates of deposit and
investment grade commercial paper that have maturities of three months or
less. As a result,

                                       21
<PAGE>   23

the interest rate market risk implicit in these investments at December 31,
1997, is low, as the investments mature within three months. The Company has not
undertaken any additional actions to cover interest rate market risk and is not
a party to any other interest rate market risk management activities.

The Company does not purchase or hold any derivative financial instruments for
trading purposes.

INTEREST RATE SENSITIVITY A ten percent change in market interest rates over the
next year would not impact the Company's earnings or cash flow as the interest
rates on the Company's long-term debt are fixed and its cash investments are
short-term. A ten percent change in market interest rates would not have a
material effect on the fair value of the Company's publicly traded long-term
debt or its short-term cash investments.

IMPACT OF THE YEAR 2000

Based on a recently completed assessment, the Company has determined that it
will be required to modify, upgrade, or replace significant portions of its
internal software, including financial, reservations, maintenance, and human
resources related software, so that its computer systems will properly utilize
dates beyond December 31, 1999. As of December 31, 1997, the Company has
commenced its year 2000 remediation program, has secured substantially all the
required resources, and expects to substantially complete its internal year 2000
efforts by March 31, 1999. The Company believes that by completing the planned
remediation program, the year 2000 issue will not adversely impact the Company's
operations or operating results. However, if the program is not completed, or
not completed timely, the year 2000 issue could have a material impact on the
operations of the Company.

In addition, the Company has contacted its critical suppliers and other entities
to determine the extent to which the Company's interface systems are vulnerable
to those third parties' failure to remediate their own year 2000 issues. While
the Company has not been informed of any material risks associated with these
entities, there is no guarantee that the systems of these critical suppliers or
other entities, including the Federal Aviation Administration, on which the
Company relies, will be

                                       22
<PAGE>   24

timely converted and will not have an adverse effect on the Company's systems or
operations.

The Company has expensed $4.0 million of costs incurred to date related to the
year 2000 issue. The total remaining cost of the year 2000 project is presently
estimated at $15 million, which will be expensed as incurred. These amounts
include only costs directly related to resolving the year 2000 issue. The costs
of the project and the date on which the Company believes it will complete the
year 2000 modifications are based on management's best estimates, which were
derived utilizing numerous assumptions of future events, including the continued
availability of certain resources. However, there can be no guarantee that these
estimates will be achieved and actual results could differ materially from those
anticipated. Specific factors that might cause such material differences
include, but are not limited to, the availability and cost of personnel trained
in this area and the ability to locate and correct all relevant computer codes.


                                       23

<PAGE>   25


ITEM 7A.  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK


     See "Management's Discussion and Analysis of Financial Condition and
Results of Operation-Market Risk."




                                       24

<PAGE>   26
ITEM 8.  FINANCIAL STATEMENTS AND SUPPLEMENTAL DATA

REPORT OF ERNST & YOUNG LLP
INDEPENDENT AUDITORS
THE BOARD OF DIRECTORS AND SHAREHOLDERS
SOUTHWEST AIRLINES CO.

We have audited the accompanying consolidated balance sheets of Southwest
Airlines Co. as of December 31, 1997 and 1996, and the related consolidated
statements of income, stockholders' equity, and cash flows for each of the three
years in the period ended December 31, 1997. These financial statements are the
responsibility of the Company's management. Our responsibility is to express an
opinion on these financial statements based on our audits.

We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in
all material respects, the consolidated financial position of Southwest Airlines
Co. at December 31, 1997 and 1996, and the consolidated results of its
operations and its cash flows for each of the three years in the period ended
December 31, 1997, in conformity with generally accepted accounting principles.


                                                /s/ ERNST & YOUNG LLP

Dallas, Texas
January 23, 1998




                                       25
<PAGE>   27
SOUTHWEST AIRLINES CO.
CONSOLIDATED BALANCE SHEET
(IN THOUSANDS EXCEPT SHARE AND PER SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                              DECEMBER 31,
                                                          1997           1996
                                                       ----------     ----------
<S>                                                    <C>            <C>       
ASSETS
Current assets:
  Cash and cash equivalents ......................     $  623,343     $  581,841
  Accounts receivable ............................         76,530         73,440
  Inventories of parts and supplies,
    at cost ......................................         52,376         51,094
  Deferred income taxes (Note 9) .................         18,843         11,560
  Prepaid expenses and other current
    assets .......................................         35,324         33,055
                                                       ----------     ----------
      Total current assets .......................        806,416        750,990

Property and equipment, at cost (Notes 2 and 5):
  Flight equipment ...............................      3,987,493      3,435,304
  Ground property and equipment ..................        601,957        523,958
  Deposits on flight equipment
    purchase contracts ...........................        221,874        198,366
                                                       ----------     ----------
                                                        4,811,324      4,157,628
  Less allowance for depreciation ................      1,375,631      1,188,405
                                                       ----------     ----------
                                                        3,435,693      2,969,223
Other assets .....................................          4,051          3,266
                                                       ----------     ----------
                                                       $4,246,160     $3,723,479
                                                       ==========     ==========

LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Accounts payable ...............................     $  160,891     $  214,232
  Accrued liabilities (Note 3) ...................        426,950        368,625
  Air traffic liability ..........................        153,341        158,098
  Current maturities of long-term
    debt (Note 4) ................................        121,324         12,327
  Other current liabilities ......................          6,007         12,122
                                                       ----------     ----------
      Total current liabilities ..................        868,513        765,404

Long-term debt less current
  maturities (Note 4) ............................        628,106        650,226
Deferred income taxes (Note 9) ...................        438,981        349,987
Deferred gains from sale and
  leaseback of aircraft ..........................        256,255        274,891
Other deferred liabilities .......................         45,287         34,659

Commitments and contingencies
  (Notes 2, 5, and 9)

Stockholders' equity (Notes 6 and 7):
  Common stock, $1.00 par value:
    680,000,000 shares authorized;
    221,207,083 and 145,112,090
    shares issued and
    outstanding in 1997 and
    1996, respectively ...........................        221,207        145,112
  Capital in excess of par value .................        155,696        181,650
  Retained earnings ..............................      1,632,115      1,321,550
                                                       ----------     ----------
     Total stockholders' equity ..................      2,009,018      1,648,312
                                                       ----------     ----------

                                                       $4,246,160     $3,723,479
                                                       ==========     ==========
</TABLE>

SEE ACCOMPANYING NOTES.

                                       26

<PAGE>   28
SOUTHWEST AIRLINES CO.
CONSOLIDATED STATEMENT OF INCOME
(IN THOUSANDS EXCEPT PER SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                  YEARS ENDED DECEMBER 31,
                                         1997           1996           1995
                                      -----------    -----------    -----------
<S>                                   <C>            <C>            <C>        
OPERATING REVENUES:
  Passenger .......................   $ 3,639,193    $ 3,269,238    $ 2,760,756
  Freight .........................        94,758         80,005         65,825
  Other ...........................        82,870         56,927         46,170
                                      -----------    -----------    -----------
     Total operating revenues .....     3,816,821      3,406,170      2,872,751
OPERATING EXPENSES:
  Salaries, wages, and
    benefits (Note 8) .............     1,136,542        999,719        867,984
  Fuel and oil ....................       494,952        484,673        365,670
  Maintenance materials and
    repairs .......................       256,501        253,521        217,259
  Agency commissions ..............       157,211        140,940        123,380
  Aircraft rentals ................       201,954        190,663        169,461
  Landing fees and other
    rentals .......................       203,845        187,600        160,322
  Depreciation ....................       195,568        183,470        156,771
  Other operating expenses ........       646,012        614,749        498,373
                                      -----------    -----------    -----------
     Total operating expenses .....     3,292,585      3,055,335      2,559,220
                                      -----------    -----------    -----------
OPERATING INCOME ..................       524,236        350,835        313,531
OTHER EXPENSES (INCOME):
  Interest expense ................        63,454         59,269         58,810
  Capitalized interest ............       (19,779)       (22,267)       (31,371)
  Interest income .................       (36,616)       (25,797)       (20,095)
  Nonoperating (gains) losses,
   net ............................           221         (1,732)         1,047
                                      -----------    -----------    -----------
     Total other expenses .........         7,280          9,473          8,391
                                      -----------    -----------    -----------
INCOME BEFORE INCOME TAXES ........       516,956        341,362        305,140
PROVISION FOR INCOME TAXES
  (NOTE 9) ........................       199,184        134,025        122,514
                                      -----------    -----------    -----------
NET INCOME ........................   $   317,772    $   207,337    $   182,626
                                      ===========    ===========    ===========

NET INCOME PER SHARE, BASIC
  (NOTES 6, 7, AND 10) ............   $      1.45    $       .95    $       .85
                                      ===========    ===========    ===========

NET INCOME PER SHARE, DILUTED
(NOTES 6, 7, AND 10) ..............   $      1.40    $       .92    $       .82
                                      ===========    ===========    ===========
</TABLE>


SEE ACCOMPANYING NOTES.


                                       27
<PAGE>   29
SOUTHWEST AIRLINES CO.
CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY
(IN THOUSANDS EXCEPT PER SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                 YEARS ENDED DECEMBER 31, 1997, 1996, AND 1995
                                                             CAPITAL
                                                            IN EXCESS
                                              COMMON           OF            RETAINED
                                              STOCK         PAR VALUE        EARNINGS         TOTAL
                                           ------------    ------------    ------------    ------------
<S>                                        <C>             <C>             <C>             <C>         
Balance at December 31, 1994 ...........   $    143,256    $    151,746    $    943,704    $  1,238,706

  Issuance of common stock upon
    exercise of executive stock
    options and pursuant to Employee
    stock option and purchase plans
    (Note 7) ...........................            777           9,907              --          10,684
  Tax benefit of options exercised .....             --           1,051              --           1,051
  Cash dividends, $.02667 per share ....             --              --          (5,749)         (5,749)
  Net income - 1995 ....................             --              --         182,626         182,626
                                           ------------    ------------    ------------    ------------
Balance at December 31, 1995 ...........        144,033         162,704       1,120,581       1,427,318

  Issuance of common stock upon
    exercise of executive stock
    options and pursuant to Employee
    stock option and purchase plans
    (Note 7) ...........................          1,079          14,513              --          15,592
  Tax benefit of options exercised .....             --           4,433              --           4,433
  Cash dividends, $.02932 per share ....             --              --          (6,368)         (6,368)
  Net income - 1996 ....................             --              --         207,337         207,337
                                           ------------    ------------    ------------    ------------
Balance at December 31, 1996 ...........        145,112         181,650       1,321,550       1,648,312

  Three-for-two stock split (Note 6) ...         73,578         (73,578)             --              --
  Issuance of common stock upon
    exercise of executive stock
    options and pursuant to Employee
    stock option and purchase plans
    (Note 7) ...........................          2,517          37,818              --          40,335
  Tax benefit of options exercised .....             --           9,806              --           9,806
  Cash dividends, $.0331 per share .....             --              --          (7,207)         (7,207)
  Net income - 1997 ....................             --              --         317,772         317,772
                                           ------------    ------------    ------------    ------------
Balance at December 31, 1997 ...........   $    221,207    $    155,696    $  1,632,115    $  2,009,018
                                           ============    ============    ============    ============
</TABLE>

SEE ACCOMPANYING NOTES.


                                       28


<PAGE>   30
SOUTHWEST AIRLINES CO.
CONSOLIDATED STATEMENT OF CASH FLOWS
(IN THOUSANDS)

<TABLE>
<CAPTION>
                                                           YEARS ENDED DECEMBER 31,
                                                       1997           1996           1995
                                                     ---------      ---------      ---------
<S>                                                  <C>            <C>            <C>      
CASH FLOWS FROM OPERATING ACTIVITIES:
       Net income ..............................     $ 317,772      $ 207,337      $ 182,626
       Adjustments to reconcile net income
         to net cash provided by operating
          activities:
          Depreciation .........................       195,568        183,470        156,771
          Deferred income taxes ................        81,711         67,253         48,147
          Amortization of deferred gains
             on sale and leaseback of
             aircraft ..........................       (15,414)       (18,263)       (24,286)
          Amortization of scheduled
           airframe overhauls ..................        20,540         20,539         17,337
          Changes in certain assets and
           liabilities:
             Accounts receivable ...............        (3,090)         6,341         (4,089)
             Other current assets ..............         6,243        (19,534)       (11,857)
             Accounts payable and
              accrued liabilities ..............         8,751        132,096         61,937
             Air traffic liability .............        (4,757)        26,942         25,017
             Other current liabilities .........        (4,204)         5,334          1,050
          Other ................................         7,468          3,713          3,789
                                                     ---------      ---------      ---------
                Net cash provided by
                 operating activities ..........       610,588        615,228        456,442

CASH FLOWS FROM INVESTING ACTIVITIES:
       Purchases of property and equipment .....      (688,927)      (677,431)      (728,643)
                                                     ---------      ---------      ---------
                Net cash used in investing
                 activities ....................      (688,927)      (677,431)      (728,643)

CASH FLOWS FROM FINANCING ACTIVITIES:
       Issuance of long-term debt ..............        98,764             --         98,811
       Proceeds from aircraft sale and
          leaseback transactions ...............            --        330,000        321,650
       Payment of long-term debt and capital
          lease obligations ....................       (12,665)       (12,695)       (10,379)
       Payment of cash dividends ...............        (6,593)        (6,216)        (5,749)
       Proceeds from Employee stock plans ......        40,335         15,592         10,693
                                                     ---------      ---------      ---------
                Net cash provided by
                  financing activities .........       119,841        326,681        415,026
                                                     ---------      ---------      ---------
    NET INCREASE IN CASH AND CASH
       EQUIVALENTS .............................        41,502        264,478        142,825
    CASH AND CASH EQUIVALENTS AT BEGINNING
       OF PERIOD ...............................       581,841        317,363        174,538
                                                     ---------      ---------      ---------

    CASH AND CASH EQUIVALENTS AT END OF
       PERIOD ..................................     $ 623,343      $ 581,841      $ 317,363
                                                     =========      =========      =========

    CASH PAYMENTS FOR:
     Interest, net of amount capitalized .......     $  42,372      $  36,640      $  25,277
     Income taxes ..............................       107,066         66,447         73,928
</TABLE>

  SEE ACCOMPANYING NOTES.


                                       29

<PAGE>   31

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
DECEMBER 31, 1997


1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

BASIS OF PRESENTATION Southwest Airlines Co. (Southwest) is a major domestic
airline that provides shorthaul, high frequency, point-to-point, low fare
service. The consolidated financial statements include the accounts of Southwest
and its wholly owned subsidiaries (the Company). All significant intercompany
balances and transactions have been eliminated. The preparation of financial
statements in conformity with generally accepted accounting principles requires
management to make estimates and assumptions that affect the amounts reported in
the financial statements and accompanying notes. Actual results could differ
from these estimates. Certain prior year amounts have been reclassified for
comparison purposes.

CASH AND CASH EQUIVALENTS Cash equivalents consist of certificates of deposit
and investment grade commercial paper issued by major corporations and financial
institutions that are highly liquid and have original maturities of three
months or less. Cash and cash equivalents are carried at cost, which
approximates market value.

INVENTORIES Inventories of flight equipment expendable parts, materials, and
supplies are carried at average cost. These items are charged to expense when
issued for use.

PROPERTY AND EQUIPMENT Depreciation is provided by the straight-line method to
residual values over periods ranging from 12 to 20 years for flight equipment
and 3 to 30 years for ground property and equipment. Property under capital
leases and related obligations are recorded at an amount equal to the present
value of future minimum lease payments computed on the basis of the Company's
incremental borrowing rate or, when known, the interest rate implicit in the
lease. Amortization of property under capital leases is on a straight-line basis
over the lease term and is included in depreciation expense. The Company records
impairment losses on long-lived assets used in operations when events and
circumstances indicate that the assets might be impaired and the undiscounted
cash flows to be generated by those assets are less than the carrying amounts of
those assets.



                                       30
<PAGE>   32

AIRCRAFT AND ENGINE MAINTENANCE The cost of engine overhauls and routine
maintenance costs for aircraft and engines are charged to maintenance expense as
incurred. Scheduled airframe overhaul costs are capitalized and amortized over
the estimated period benefited, presently ten years. Modifications that
significantly enhance the operating performance or extend the useful lives of
aircraft or engines are capitalized and amortized over the remaining life of the
asset.

REVENUE RECOGNITION Passenger revenue is recognized when transportation is
provided. Tickets sold but not yet used are included in "Air traffic liability,"
which includes estimates that are evaluated and adjusted periodically. Any
adjustments resulting therefrom are included in results of operations for the
periods in which the evaluations are completed.

FREQUENT FLYER PROGRAM The Company accrues the estimated incremental cost of
providing free travel awards earned under its Rapid Rewards frequent flyer
program. The Company also sells flight segment credits to companies
participating in its Rapid Rewards frequent flyer program. The revenue from the
sale of flight segment credits is recognized when the credits are sold.

ADVERTISING The Company expenses the costs of advertising as incurred.
Advertising expense for the years ended December 31, 1997, 1996, and 1995 was
$112,961,000, $109,136,000, and $92,087,000, respectively.

STOCK-BASED EMPLOYEE COMPENSATION Pursuant to Statement of Financial Accounting
Standards No. 123 (SFAS 123), Accounting for Stock-Based Compensation, the
Company accounts for stock-based compensation plans utilizing the provisions of
Accounting Principles Board Opinion No. 25 (APB 25), Accounting for Stock Issued
to Employees and related Interpretations because, as discussed in Note 7, the
alternative fair value accounting provided for under SFAS 123 requires use of
option valuation models that were not developed for use in valuing employee
stock options.

EARNINGS PER SHARE In 1997, the Financial Accounting Standards Board issued
Statement of Financial Accounting Standards No. 128 (SFAS 128), Earnings per
Share. SFAS 128 replaced the calculation of primary and fully diluted earnings
per share with basic and diluted earnings per share. Unlike primary earnings per
share, basic earnings per share excludes any dilutive effects of stock options.
Diluted earnings 



                                       31
<PAGE>   33

per share is similar to the previously reported fully diluted earnings per
share. Earnings per share amounts for all periods have been restated and
presented to conform to the SFAS 128 requirements.

DERIVATIVE FINANCIAL INSTRUMENTS The Company utilizes purchased crude oil call
options and fixed price swap agreements to hedge a portion of its exposure to
fuel price fluctuations. At December 31, 1997, 1996, and 1995, and during the
years then ended, outstanding call options and swap agreements were immaterial.

The cost of purchased crude oil call options and gains and losses on fixed price
swap agreements are deferred and expensed to fuel expense in the same month that
the underlying fuel being hedged is used. Gains and losses resulting from
hedging positions terminated or settled early are recorded to fuel expense in
the month of termination or settlement. Gains and losses on hedging transactions
have not been material.

Any such agreements expose the Company to credit loss in the event of
nonperformance by the other parties to the agreements. The Company does not
anticipate such nonperformance.

The Company does not hold or issue any financial instruments for trading
purposes.

2. COMMITMENTS

The Company's contractual purchase commitments consist primarily of scheduled
aircraft acquisitions. Twenty-two 737-700 aircraft are scheduled for delivery in
1998, 25 in 1999, 23 in 2000, 21 in 2001, 21 in 2002, eight in 2003, and six in
2004. In addition, the Company has options to purchase up to 62 -700s during
2003-2006. The Company has the option, which must be exercised two years prior
to the contractual delivery date, to substitute 737-600s or 737-800s for the
- -700s scheduled subsequent to 1999. Aggregate funding needed for these
commitments is approximately $3,109.8 million, subject to adjustments for
inflation, due as follows: $565.7 million in 1998, $747.1 million in 1999,
$574.1 million in 2000, $510.1 million in 2001, $434.5 million in 2002, $172.8
million in 2003, and $105.5 million in 2004.



                                       32
<PAGE>   34

3. ACCRUED LIABILITIES
(IN THOUSANDS)

<TABLE>
<CAPTION>
                                                                   1997               1996
                                                                 --------           --------
<S>                                                              <C>                <C>     
Aircraft rentals .............................                   $123,669           $121,384
Employee profitsharing and savings plans 
  (Note 8) ...................................                     92,857             61,286
Vacation pay .................................                     50,812             44,763
Other ........................................                    159,612            141,192
                                                                 --------           --------
                                                                 $426,950           $368,625
                                                                 ========           ========
</TABLE>


4. LONG-TERM DEBT
(IN THOUSANDS)

<TABLE>
<CAPTION>
                                                         1997                  1996
                                                       --------              --------
<S>                                                    <C>                   <C>     
9 1/4% Notes due 1998 ...............                  $100,000              $100,000
9.4% Notes due 2001 .................                   100,000               100,000
8 3/4% Notes due 2003 ...............                   100,000               100,000
8% Notes due 2005....................                   100,000               100,000
7 7/8% Notes due 2007................                   100,000               100,000
7 3/8% Debentures due 2027...........                   100,000                    --
Capital leases (Note 5) .............                   152,324               165,610
Other ...............................                        --                    10
                                                       --------              --------
                                                        752,324               665,620
Less current maturities .............                   121,324                12,327
Less debt discount ..................                     2,894                 3,067
                                                       --------              --------
                                                       $628,106              $650,226
                                                       ========              ========
</TABLE>

On February 28, 1997, the Company issued $100 million of senior unsecured 7 3/8%
Debentures due March 1, 2027. Interest is payable semi-annually on March 1 and
September 1. The Debentures may be redeemed, at the option of the Company, in
whole at any time or in part from time to time, at a redemption price equal to
the greater of the principal amount of the Debentures plus accrued interest at
the date of redemption or the sum of the present values of the remaining
scheduled payments of principal and 



                                       33
<PAGE>   35

interest thereon, discounted to the date of redemption at the comparable
treasury rate plus 20 basis points, plus accrued interest at the date of
redemption.

On March 7, 1995, the Company issued $100 million of senior unsecured 8% Notes
due March 1, 2005. Interest is payable semi-annually on March 1 and September 1.
The Notes are not redeemable prior to maturity.

On September 9, 1992, the Company issued $100 million of senior unsecured 7 7/8%
Notes due September 1, 2007. Interest is payable semi-annually on March 1 and
September 1. The Notes are not redeemable prior to maturity.

During 1991, the Company issued $100 million of senior unsecured 9 1/4% Notes,
$100 million of senior unsecured 9.4% Notes, and $100 million of senior
unsecured 8 3/4% Notes due February 15, 1998, July 1, 2001, and October 15,
2003, respectively. Interest on the Notes is payable semi-annually. The Notes
are not redeemable prior to maturity.

The fair values, based on quoted market prices, of these securities at December
31, 1997, were as follows (in thousands):

<TABLE>
<S>                                                      <C>     
9 1/4% Notes due 1998 ...............                     $100,350
9.4% Notes due 2001 .................                      110,150
8 3/4% Notes due 2003 ...............                      111,630
8% Notes due 2005  ..................                      108,920
7 7/8% Notes due 2007................                      109,410
7 3/8% Debentures due 2027...........                      105,660
</TABLE>

In addition to the credit facilities described above, Southwest has an unsecured
Bank Credit Agreement with a group of banks that permits Southwest to borrow
through May 6, 2002, on a revolving credit basis, up to $475 million. Interest
rates on borrowings under the Credit Agreement can be, at the option of
Southwest, the greater of the agent bank's prime rate or the federal funds rate
plus .5 percent, .17 percent over LIBOR, or a fixed rate offered by the banks at
the time of borrowing. The commitment fee is .08 percent per annum. There were
no outstanding borrowings under this 




                                       34
<PAGE>   36

agreement, or prior similar agreements, at December 31, 1997 or 1996.

5. LEASES

Total rental expense for operating leases charged to operations in 1997, 1996,
and 1995 was $297,158,000, $280,389,000, and $247,033,000, respectively. The
majority of the Company's terminal operations space, as well as 106 aircraft,
were under operating leases at December 31, 1997. The amounts applicable to
capital leases included in property and equipment were (in thousands):

<TABLE>
<CAPTION>
                                                             1997               1996
                                                           --------           --------
<S>                                                        <C>                <C>     
Flight equipment ............................              $227,803           $226,677
Less accumulated amortization ...............               122,346            111,815
                                                           --------           --------
                                                           $105,457           $114,862
                                                           ========           ========
</TABLE>

Future minimum lease payments under capital leases and noncancelable operating
leases with initial or remaining terms in excess of one year at December 31,
1997, were (in thousands):

<TABLE>
<CAPTION>
                                       CAPITAL                  OPERATING
                                       LEASES                     LEASES
                                      --------                  ----------
<S>                                   <C>                       <C>       
      1998 .....................      $ 32,026                  $  234,828
      1999 .....................        20,245                     227,679
      2000 .....................        16,871                     224,302
      2001 .....................        17,391                     209,862
      2002 .....................        17,561                     196,410
After 2002 .....................       137,799                   2,147,915
                                      --------                  ----------
Total minimum lease payments ...       241,893                  $3,240,996
                                                                ==========
Less amount representing
   interest ....................        89,569
                                      --------
Present value of minimum
   lease payments ..............       152,324
Less current portion ...........        21,324
                                      --------
Long-term portion ..............      $131,000
                                      ========
</TABLE>


                                       35
<PAGE>   37


The aircraft leases generally can be renewed, at rates based on fair market
value at the end of the lease term, for one to five years. Most aircraft leases
have purchase options at or near the end of the lease term at fair market value,
but generally not to exceed a stated percentage of the lessor's defined cost of
the aircraft.

6. COMMON STOCK

The Company has one class of common stock. Holders of shares of common stock are
entitled to receive dividends when and if declared by the Board of Directors and
are entitled to one vote per share on all matters submitted to a vote of the
shareholders.

At December 31, 1997, the Company had common stock reserved for issuance
pursuant to Employee stock benefit plans (49,254,768 shares) and upon exercise
of rights (270,461,851 shares) pursuant to the Common Stock Rights Agreement, as
amended (Agreement).

Pursuant to the Agreement, each outstanding share of the Company's common stock
is accompanied by one common share purchase right (Right). Each Right entitles
its holder to purchase one share of common stock at an exercise price of $11.11
and is exercisable only in the event of a proposed takeover, as defined by the
Agreement. The Company may redeem the Rights at $.0074 per Right prior to the
time that 15 percent of the common stock has been acquired by a person or group.
If the Company is acquired, as defined in the Agreement, each Right will entitle
its holder to purchase for $11.11 that number of the acquiring company's or the
Company's common shares, as provided in the Agreement, having a market value of
two times the exercise price of the Right. The Rights will expire no later than
July 30, 2006.

On September 25, 1997, the Company's Board of Directors declared a three-for-two
stock split, distributing 73,577,983 shares on November 26, 1997. Unless
otherwise stated, all per share data presented in the accompanying consolidated
financial statements and notes thereto have been restated to give effect to the
stock split.




                                       36
<PAGE>   38


7. STOCK PLANS

At December 31, 1997, the Company had six stock-based compensation plans and
other stock options outstanding, which are described below. The Company applies
APB 25 and related Interpretations in accounting for its stock-based
compensation. Accordingly, no compensation expense is recognized for its fixed
option plans because the exercise prices of the Company's Employee stock options
equal or exceed the market prices of the underlying stock on the dates of the
grants. Compensation expense for other stock options is not material.

The Company has five fixed option plans. Under the 1991 Incentive Stock Option
Plan, the Company may grant options to key Employees for up to 13,500,000 shares
of common stock. Under the 1991 Non-Qualified Stock Option Plan, the Company may
grant options to key Employees and non-employee directors for up to 1,125,000
shares of common stock. All options granted under these plans have ten-year
terms and vest and become fully exercisable at the end of three, five, or ten
years of continued employment, depending upon the grant type.

Under the 1995 Southwest Airlines Pilots' Association Non-Qualified Stock Option
Plan (SWAPA Plan), the Company may grant options to Pilots for up to 27,000,000
shares of common stock. An initial grant of approximately 21,750,000 shares was
made on January 12, 1995, at an option price of $13.33 per share, which exceeded
the market price of the Company's stock on that date. Options granted under the
initial grant vest in ten annual increments of ten percent. On September 1 of
each year of the agreement beginning in 1996, additional options will be granted
to Pilots that become eligible during that year. Additional options granted on
September 1, 1997 and 1996, vest in seven annual increments of 14.3 percent and
eight annual increments of 12.5 percent, respectively. Options under all grants
must be exercised prior to January 31, 2007, or within a specified time upon
retirement or termination. In the event that the Southwest Airlines Pilots'
Association exercises its option to make the collective bargaining agreement
amendable on September 1, 1999, any unexercised options will be canceled on
December 1, 1999.

Under the 1996 Incentive Stock Option Plan, the Company may grant options to key
Employees for up to 9,000,000 shares of common stock. Under the 1996
Non-Qualified Stock Option Plan, the Company may grant options to key Employees
and non-employee 





                                       37
<PAGE>   39

directors for up to 862,500 shares of common stock. All options
granted under these plans have ten-year terms and vest and become fully
exercisable at the end of three, five, or ten years of continued employment,
depending upon the grant type.

Under all fixed option plans, except the SWAPA Plan, the exercise price of each
option equals the market price of the Company's stock on the date of grant.
Under the SWAPA Plan, for additional options granted each September 1, the
exercise price will be equal to 105 percent of the fair value of such stock on
the date of the grant.

Information regarding the Company's five fixed stock option plans, as adjusted
for the three-for-two stock split on November 26, 1997, is summarized below:




                                       38
<PAGE>   40




<TABLE>
<CAPTION>
                                                       INCENTIVE PLANS               NON-QUALIFIED PLANS
                                                       ---------------               -------------------
                                                                     AVERAGE                      AVERAGE
                                                    OPTIONS          EXERCISE      OPTIONS        EXERCISE
                                                    -------           PRICE        -------         PRICE
                                                                      -----                        -----
<S>                                             <C>               <C>            <C>           <C>   
 Outstanding December 31, 1994..........           7,217,943         $ 8.05         532,883       $ 9.07

   Granted - Incentive Plans............           1,474,821          12.53              --           --

   Granted - SWAPA Plan.................                  --             --      21,790,575        13.33

   Granted - Other Non-Qualified

       Plans............................                  --             --         139,973        12.51

   Exercised............................            (412,587)          5.67         (90,765)       10.08

   Surrendered..........................            (462,358)          8.47         (91,562)       13.07
                                                  ----------                     ----------             

 Outstanding December 31, 1995..........           7,817,819           8.98      22,281,104        13.24

   Granted - Incentive Plans............           2,505,516          16.79              --           --

   Granted - SWAPA Plan.................                  --             --         699,300        15.88

   Granted - Other  Non-Qualified

       Plans............................                  --             --         103,683        16.78

   Exercised............................            (593,772)          6.85        (435,578)       11.93

   Surrendered..........................            (375,669)         13.44        (142,477)       13.33
                                                  ----------                     ----------             

 Outstanding December 31, 1996..........           9,353,894          11.03      22,506,032        13.36


    Granted - Incentive Plans...........           2,455,158          14.51              --           --

    Granted - SWAPA Plan................                  --             --         882,000        19.79

    Granted - Other Non-Qualified 
       Plans............................                  --             --         145,406        14.51

    Exercised...........................          (1,151,926)          9.04      (1,771,831)       13.27

    Surrendered.........................            (670,013)         14.58         (99,212)       13.59
                                                  ----------                     ----------

 Outstanding December 31, 1997..........           9,987,113         $11.87      21,662,395       $13.63
                                                  ==========                     ==========  

 Exercisable December 31, 1997..........           2,081,222                      7,132,653

 Available for granting in future

 periods................................           9,244,087                      4,853,562

</TABLE>


                                        39

<PAGE>   41
The following table summarizes information about stock options outstanding under
the five fixed option plans at December 31, 1997:


<TABLE>
<CAPTION>
                                              OPTIONS OUTSTANDING                          OPTIONS EXERCISABLE
                                              -------------------                          -------------------
                                                   WEIGHTED-         
                                                    AVERAGE          WEIGHTED-                              WEIGHTED- 
                                 NUMBER            REMAINING          AVERAGE             NUMBER            AVERAGE 
   RANGE OF                    OUTSTANDING        CONTRACTUAL        EXERCISE           EXERCISABLE         EXERCISE 
EXERCISE PRICES                AT 12/31/97           LIFE              PRICE            AT 12/31/97           PRICE  
- ---------------                -----------           ----              -----            -----------           -----
<S>                             <C>                <C>               <C>                 <C>                <C>     
$ 4.01 to $ 5.21                    3,084,861        3.04 yrs.         $ 4.09                 993,711        $   4.25
$ 7.56 to $ 8.04                      415,464        4.03                7.97                  92,589            7.83
$11.25 to $16.79                   26,244,958        8.81               13.73               7,621,620           13.54
$17.29 to $24.96                    1,904,225        7.55               19.82                 505,955           21.85
                                   ----------                                               ---------       
$ 4.01 to $24.96                   31,649,508        8.11 yrs.         $13.08               9,213,875        $  12.93
                                   ==========                                               =========       
</TABLE>

The Company has granted options to purchase the Company's common stock related
to employment contracts with the Company's president and chief executive
officer. Depending upon the grant, these options have terms of ten years from
the date of grant or ten years from the date exercisable and vest and become
fully exercisable over three or four years. No options were granted in 1997 or
1995. In 1996, the Company granted 217,000 options with an exercise price of
$1.00 per share and 750,000 options with an exercise price of $15.67 per share
related to the 1996 employment agreement. At December 31, 1997, 1996, and 1995,
total options of 2,611,000, 2,847,000, and 2,133,000 were outstanding,
respectively. At December 31, 1997, total options of 2,031,000 were exercisable
at exercise prices ranging from $1.00 to $15.67 per share. Options for 236,000,
253,000, and 101,000 shares were exercised in 1997, 1996, and 1995,
respectively.

Under the 1991 Employee Stock Purchase Plan (ESPP), at December 31, 1997, the
Company is authorized to issue up to a balance of 871,000 shares of common stock
to Employees of the Company at a price equal to 90 percent of the market value
at the end of each purchase period. Common stock purchases are paid for through
periodic payroll deductions. Participants under the plan received 440,000 shares
in 1997, 464,000 shares in 1996, and 583,000 shares in 1995 at average prices of
$16.00, $15.37, and $12.79, respectively.


                                       40
<PAGE>   42

Pro forma information regarding net income and net income per share is required
by SFAS 123 and has been determined as if the Company had accounted for its
Employee stock-based compensation plans and other stock options under the fair
value method of SFAS 123. The fair value of each option grant is estimated on
the date of grant using the Black-Scholes option pricing model with the
following weighted-average assumptions used for grants under the fixed option
plans in 1997, 1996, and 1995, respectively: dividend yield of .22 percent, .16
percent, and .21 percent; expected volatility of 38.23 percent, 35.37 percent,
and 36.85 percent; risk-free interest rate of 5.80 percent, 5.89 percent, and
7.79 percent; and expected lives of 5.0 years for all periods. Assumptions for
the stock options granted in 1996 to the Company's president and chief executive
officer were the same as for the fixed option plans except for the
weighted-average expected lives of 8.0 years.

The weighted-average fair value of options granted under the five fixed option
plans during 1997, 1996, and 1995 was $6.12, $6.78, and $5.61, respectively, for
the incentive plans; $7.67, $6.16, and $5.31, respectively, for the SWAPA Plan;
and $6.12, $6.78, and $5.61, respectively, for other non-qualified plans. The
weighted-average fair value of options granted in 1996 to the Company's
president and chief executive officer relative to an employment contract was
$9.32. No such options were granted in 1997 or 1995. The weighted-average fair
value of each purchase right under the ESPP granted in 1997, 1996, and 1995,
which is equal to the ten percent discount from the market value of the common
stock at the end of each purchase period, was $1.78, $1.71, and $1.43,
respectively.

The Black-Scholes option valuation model was developed for use in estimating the
fair value of traded options which have no vesting restrictions and are fully
transferable. In addition, option valuation models require the input of highly
subjective assumptions including expected stock price volatility. Because the
Company's Employee stock options have characteristics significantly different
from those of traded options and because changes in the subjective input
assumptions can materially affect the fair value estimate, in management's
opinion, the existing models do not necessarily provide a reliable single
measure of the fair value of its Employee stock options.

For purposes of pro forma disclosures, the estimated fair value of stock-based
compensation plans and other options is amortized 



                                       41
<PAGE>   43

to expense primarily over the vesting period. The Company's pro forma net income
and net income per share is as follows (in thousands except per share amounts):

<TABLE>
<CAPTION>
                                                               1997              1996               1995
                                                               ----              ----               ----
<S>                                                          <C>               <C>                <C>     
NET INCOME:                               As reported        $317,772          $207,337           $182,626
                                          Pro forma          $306,553          $196,478           $167,907

NET INCOME PER SHARE, BASIC:              As reported        $   1.45          $    .95           $    .85
                                          Pro forma          $   1.40          $    .90           $    .78
                                                                     
NET INCOME PER SHARE, DILUTED:            As reported        $   1.40          $    .92           $    .82
                                          Pro forma          $   1.34          $    .89           $    .76
</TABLE>                                                         

As required, the pro forma disclosures above include only options granted since
January 1, 1995. Consequently, the effects of applying SFAS 123 for providing
pro forma disclosures may not be representative of the effects on reported net
income for future years until all options outstanding are included in the pro
forma disclosures.


8. EMPLOYEE PROFITSHARING AND SAVINGS PLANS

Substantially all of Southwest's Employees are members of the Southwest Airlines
Co. Profitsharing Plan. Total profitsharing expense charged to operations in
1997, 1996, and 1995 was $91,256,000, $59,927,000, and $54,033,000,
respectively.

The Company sponsors Employee savings plans under Section 401(k) of the Internal
Revenue Code. The plans cover substantially all full-time Employees. The amount
of matching contributions varies by Employee group. Company contributions
generally vest over five years with credit for prior years' service granted.
Company matching contributions expensed in 1997, 1996, and 1995 were
$39,744,000, $35,125,000, and $28,954,000, respectively.



9. INCOME TAXES

Deferred income taxes reflect the net tax effects of temporary differences
between the carrying amounts of assets and liabilities for financial reporting
purposes and the amounts used for income tax purposes. The components of
deferred tax assets




                                       42
<PAGE>   44

and liabilities at December 31, 1997 and 1996 are as follows (in thousands):


<TABLE>
<CAPTION>
                                                   1997         1996
                                                 --------     --------
<S>                                              <C>          <C>     
DEFERRED TAX LIABILITIES:

     Accelerated depreciation...............     $543,547     $467,372
     Scheduled airframe maintenance.........       33,202       30,984
     Other..................................       83,607       78,195
                                                 --------     --------
        Total deferred tax liabilities......      660,356      576,551

DEFERRED TAX ASSETS:

     Deferred gains from sale and
        leaseback of aircraft...............      112,659      114,514
     Capital and operating leases...........       61,747       58,252
     Alternative minimum tax credit
         carryforward.......................           --        6,019
     Other..................................       65,812       59,339
                                                 --------     --------
        Total deferred tax assets ..........      240,218      238,124
                                                 --------     --------
        Net deferred tax liability .........     $420,138     $338,427
                                                 ========     ========
</TABLE>

The provision for income taxes is composed of the following (in thousands):

<TABLE>
<CAPTION>
                                1997         1996         1995
                              --------     --------     --------
<S>                           <C>          <C>          <C>     
CURRENT:
  Federal ...............     $102,938     $ 59,101     $ 64,420
  State .................       14,535        7,671        9,947
                              --------     --------     --------
     Total current ......      117,473       66,772       74,367
DEFERRED:
  Federal ...............       75,990       60,967       44,580
  State .................        5,721        6,286        3,567
                              --------     --------     --------
     Total deferred .....       81,711       67,253       48,147
                              --------     --------     --------

                              $199,184     $134,025     $122,514
                              ========     ========     ========
</TABLE>


Southwest has received examination reports from the Internal Revenue Service
(IRS) proposing certain adjustments to Southwest's income tax returns for 1989
through 1991. The adjustments relate to aircraft maintenance costs incurred by
Southwest, as well as 





                                       43
<PAGE>   45


other members of the aviation industry, during that time period. Southwest
intends to vigorously protest the adjustments proposed, with which it does not
agree. The industry's difference with the IRS involves complex issues of law and
fact that are likely to take a substantial period of time to resolve. Management
believes that final resolution of such protest will not have a materially
adverse effect upon the results of operations of Southwest.

The effective tax rate on income before income taxes differed from the federal
income tax statutory rate for the following reasons (in thousands):

<TABLE>
<CAPTION>
                                 1997          1996          1995
                              ---------      ---------     ---------
<S>                           <C>            <C>           <C>      
Tax at statutory
  U.S. tax rates ........     $ 180,935      $ 119,477     $ 106,799
Nondeductible items .....         5,893          5,168         4,488
State income taxes,
  net of federal
  benefit ...............        13,166          9,072         8,784
Other, net ..............          (810)           308         2,443
                              ---------      ---------     ---------
  Total income tax
    provision ...........     $ 199,184      $ 134,025     $ 122,514
                              =========      =========     =========
</TABLE>


10.  NET INCOME PER SHARE

The following table sets forth the computation of basic and diluted earnings per
share (in thousands except per share amounts):

<TABLE>
<CAPTION>
                                                    1997         1996         1995
                                                  --------     --------     -------- 
<S>                                               <C>          <C>          <C>      
NUMERATOR:
  Net income, available to common
    stockholders-numerator for basic
    and diluted earnings per share                $317,772     $207,337     $182,626 
                                                                                     
                                                  ========     ========     ======== 
                                                                                     
DENOMINATOR:                                                                         
  Weighted-average shares                                                            
    outstanding, basic                             219,088      217,118      215,517 
                                                                                     
  Dilutive effect of Employee stock                                                  
    options                                          8,371        7,873        6,247 
                                                  --------     --------     -------- 
  Adjusted weighted-average shares                                                   
    outstanding, diluted                           227,459      224,991      221,764 
                                                  ========     ========     ======== 
                                                                                     
NET INCOME PER SHARE:                                                                
  Basic                                           $   1.45     $    .95     $    .85 
                                                  ========     ========     ======== 
  Diluted                                         $   1.40     $    .92     $    .82 
                                                  ========     ========     ======== 
</TABLE>
                                                  




                                       44

<PAGE>   46


                      QUARTERLY FINANCIAL DATA (UNAUDITED)
                     (IN THOUSANDS EXCEPT PER SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                      THREE MONTHS ENDED
                                                      ------------------

1997                                    MARCH 31     JUNE 30      SEPT. 30     DEC. 31
- ----                                    --------     --------     --------     --------
<S>                                     <C>          <C>          <C>          <C>     
Operating revenues ................     $887,095     $956,892     $997,241     $975,593
Operating income ..................       87,203      156,407      151,770      128,856
Income before income taxes ........       83,401      153,823      150,387      129,345
Net income ........................       50,874       93,832       92,511       80,555
Net income per share, basic .......          .23          .43          .42          .36
Net income per share, diluted .....          .23          .42          .41          .35

<CAPTION>
1996                                    MARCH 31     JUNE 30      SEPT. 30     DEC. 31
- ----                                    --------     --------     --------     --------
<S>                                     <C>          <C>          <C>          <C>     
Operating revenues ................     $772,529     $910,308     $891,492     $831,841
Operating income ..................       57,393      142,206      102,934       48,302
Income before income taxes ........       54,771      139,989      100,243       46,359
Net income ........................       33,000       85,316       60,858       28,163
Net income per share, basic .......          .15          .39          .28          .13
Net income per share, diluted .....          .15          .38          .27          .13
</TABLE>


ITEM 9.  CHANGES AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL
         DISCLOSURE

    None to be reported.



                                       45

<PAGE>   47



                                    PART III

ITEM 10.  DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

     See "Election of Directors" incorporated herein by reference, from pages
1-4 of the definitive Proxy Statement for Southwest's Annual Meeting of
Shareholders to be held May 21, 1998. See "Executive Officers of the Registrant"
in Part I following Item 4 for information relating to executive officers.

ITEM 11.  EXECUTIVE COMPENSATION

     See "Compensation of Executive Officers," incorporated herein by reference,
from pages 6-9 of the definitive Proxy Statement for Southwest's Annual Meeting
of Shareholders to be held May 21, 1998.

ITEM 12.  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

     See "Voting Securities and Principal Shareholders," incorporated herein by
reference, from pages 4-5 of the definitive Proxy Statement for Southwest's
Annual Meeting of Shareholders to be held May 21, 1998.

ITEM 13.  CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

     See "Election of Directors" incorporated herein by reference, from pages
1-4 of the definitive Proxy Statement for Southwest's Annual Meeting of
Shareholders to be held May 21, 1998.

                                     PART IV

ITEM 14.  EXHIBITS, FINANCIAL STATEMENT SCHEDULES, AND REPORTS ON FORM 8-K

(a)  1. Financial Statements:
        The financial statements included in Item 8 above are filed as part of
        this annual report.

     2. Financial Statement Schedules:
        There are no financial statement schedules filed as part of this annual
        report, since the required information is included in the consolidated
        financial statements, including the notes thereto, or the circumstances
        requiring inclusion of such schedules are not present.

     3. Exhibits:

        3.1     Restated Articles of Incorporation of Southwest (incorporated by
                reference to Exhibit 4.1 to Southwest's Registration Statement
                on Form S-3 (File No. 33-52155)); Amendment to Restated Article
                of Incorporation of Southwest (incorporated by reference to
                Exhibit 4.1 to Southwest's Quarterly Report on Form 10-Q for the
                quarter ended June 30, 1996 (File No. 1-7259).

        3.2     Bylaws of Southwest, as amended through February 1994
                (incorporated by reference to Exhibit 3.2 to Southwest's Annual
                Report on Form 10-K for the year ended December 31, 1993 (File
                No. 1-7259)).

        4.1     Restated Credit Agreement dated May 6, 1997, between Southwest
                and Bank of America National Trust and Savings Association, and
                the other banks named therein, and such banks.

                                       46

<PAGE>   48




        4.2     Specimen certificate representing Common Stock of Southwest
                (incorporated by reference to Exhibit 4.2 to Southwest's Annual
                Report on Form 10-K for the year ended December 31, 1994 (File
                No. 1-7259)).

        4.3     Indenture dated as of December 1, 1985 between Southwest and
                MBank Dallas, N.A., Trustee, relating to an unlimited amount of
                Debt Securities (incorporated by reference to Exhibit 4.1 of
                Southwest's Current Report on Form 8-K dated February 26, 1986
                (File No. 1-7259)) and First Supplemental Indenture dated as of
                January 21, 1988, substituting MTrust Corp, National
                Association, as Trustee, thereunder (incorporated by reference
                to Exhibit 4.3 on Southwest's Annual Report on Form 10-K for the
                year ended December 31, 1987 (File 1-7259)).

        4.4     Amended and Restated Rights Agreement dated July 18, 1996
                between Southwest and Continental Stock Transfer & Trust
                Company, as Rights Agent (incorporated by reference to Exhibit
                1, Southwest's Registration Statement on Form 8-A/A dated August
                12, 1996 (File No. 1-7259)).

        4.5     Indenture dated as of June 20, 1991 between Southwest Airlines
                Co. and Bank of New York, successor to NationsBank of Texas,
                N.A. (formerly NCNB Texas National Bank), Trustee (incorporated
                by reference to Exhibit 4.1 to Southwest's Current Report on
                Form 8-K dated June 24, 1991 (File No. 1-7259)).

        4.6     Indenture dated as of February 25, 1997 between the Company and
                U.S. Trust Company of Texas, N.A. (incorporated by reference to
                Exhibit 4.1 to Southwest's Annual Report on Form 10-K for the
                year ended December 31, 1996 (File No. 1-7259)).

                Southwest is not filing any other instruments evidencing any
                indebtedness because the total amount of securities authorized
                under any single such instrument does not exceed 10% of its
                total consolidated assets. Copies of such instruments will be
                furnished to the Securities and Exchange Commission upon
                request.

        10.1    General Terms Agreement between CFM International, Inc. and
                Southwest (with all amendments through March 29, 1990) dated May
                28, 1981 (incorporated by reference to Exhibit 10.2 on
                Southwest's Annual Report on Form 10-K for the year ended
                December 31, 1989 (File No. 1-7259)); Amendments from November
                6, 1989 through March 29, 1993 (incorporated by reference to
                Exhibit 10.2 on Southwest's Annual Report on Form 10-K for the
                year ended December 31, 1992 (File No. 1-7259)); Amendments from
                March 29, 1993 through March 29, 1994 (incorporated by reference
                to Exhibit 10.2 to Southwest's Annual Report on Form 10-K for
                the year ended December 31, 1993 (File No. 1-7259)); Amendment
                No. 7 and Letter Agreement No. 11, each dated as of January 19,
                1994 (incorporated by reference to Exhibit 10.2 to Southwest's
                Annual Report on Form 10-K for the year ended December 31, 1993
                (File No. 1-7259)).

        10.2    Purchase Agreement No. 1810, dated January 19, 1994 between The
                Boeing Company and Southwest (incorporated by reference to
                Exhibit 10.4 to Southwest's Annual Report on Form 10-K for the
                year ended December 31, 1993 (File No. 1-7259)); Supplemental
                Agreement No. 1. (incorporated by reference to Exhibit 10.3 to
                Southwest's Annual Report on Form 10-K for the year ended
                December 31, 1996 (File No. 1-7259)).; Supplemental Agreements
                No. 2, 3 and 4.


                                       47

<PAGE>   49



                Pursuant to 17 CFR 240.24b-2, confidential information has been
                omitted and has been filed separately with the Securities and
                Exchange Commission pursuant to a Confidential Treatment
                Application filed with the Commission.

                The following exhibits filed under paragraph 10 of Item 601 are
                the Company's compensation plans and arrangements.

        10.3    Form of Executive Employment Agreement between Southwest and
                certain key employees pursuant to Executive Service Recognition
                Plan (incorporated by reference to Exhibit 28 to Southwest
                Quarterly Report on Form 10-Q for the quarter ended June 30,
                1987 (File No. 1-7259)).

        10.4    1992 stock option agreements between Southwest and Herbert D.
                Kelleher (incorporated by reference to Exhibit 10.8 to
                Southwest's Annual Report on Form 10-K for the year ended
                December 31, 1991 (File No. 1-7259)).

        10.5    1987 stock option agreement between Southwest and Herbert D.
                Kelleher (incorporated by reference to Exhibit 10.11 to
                Southwest's Annual Report on Form 10-K for the year ended
                December 31, 1987 (File No. 1-7259)).

        10.6    1996 employment contract between Southwest and Herbert D.
                Kelleher and related stock option agreements (incorporated by
                reference to Exhibit 10.8 to Southwest's Annual Report on Form
                10-K for the year ended December 31, 1996 (File No. 1-7259)).

        10.7    1991 Incentive Stock Option Plan (incorporated by reference to
                Exhibit 4.1 to Registration Statement on Form S-8 (File No.
                33-40652)).

        10.8    1991 Non-Qualified Stock Option Plan (incorporated by reference
                to Exhibit 4.2 to Registration Statement on Form S-8 (File No.
                33-40652)).

        10.9    1991 Employee Stock Purchase Plan as amended May 20, 1992
                (incorporated by reference to Exhibit 10.13 to Southwest's
                Annual Report on Form 10-K for the year ended December 31, 1992
                (File No. 1-7259)).

        10.10   Southwest Airlines Co. Profit Sharing Plan (incorporated by
                reference to Exhibit 10.13 to Southwest's Annual Report on Form
                10-K for the year ended December 31, 1991 (File No. 1-7259)).

        10.11   Southwest Airlines Co. 401(k) Plan (incorporated by reference to
                Exhibit 10.14 to Southwest's Annual Report on Form 10-K for the
                year ended December 31, 1991 (File No. 1-7259)).

        10.12   Southwest Airlines Co. 1995 SWAPA Non-Qualified Stock Option
                Plan (incorporated by reference to Exhibit 10.14 to Southwest's
                Annual Report on Form 10-K for the year ended December 31, 1994
                (File No. 1-7259)).

        10.13   1996 Incentive Stock Option Plan (incorporated by reference to
                Exhibit 4.1 to Registration Statement on Form S-8 (File No.
                333-20275)).

        10.14   1996 Non-Qualified Stock Option Plan (incorporated by reference
                to Exhibit 4.2 to Registration Statement on Form S-8 (File No.
                333-20275)).

        22      Subsidiaries of Southwest.

                                       48

<PAGE>   50



        23      Consent of Ernst & Young LLP, Independent Auditors.

        27      Financial Data Schedule.

        A copy of each exhibit may be obtained at a price of 15 cents per page,
$10.00 minimum order, by writing to: Director of Investor Relations, Southwest
Airlines Co., P.O. Box 36611, Dallas, Texas 75235-1611.

(b) There were no Form 8-K's filed during the fourth quarter of 1997.



                                       49

<PAGE>   51




                                   SIGNATURES

     Pursuant to the requirements of Section 13 or 15(d) of the Securities and
Exchange Act of 1934, the registrant has duly caused this report to be signed on
its behalf by the undersigned, thereunto duly authorized.

                                       SOUTHWEST AIRLINES CO.

March 19, 1998
                                       By /s/ Gary C. Kelly
                                          --------------------------------------
                                              Gary C. Kelly
                                              Vice President-Finance,
                                              Chief Financial Officer


     Pursuant to the requirements of the Securities Exchange Act of 1934, this
report has been signed below by the following persons on March 19, 1998 on
behalf of the registrant and in the capacities indicated.

        Signature                                     Capacity
        ---------                                     --------

/s/ Herbert D. Kelleher                 Chairman of the Board of Directors,
- -----------------------------           President and Chief Executive Officer
Herbert D. Kelleher          

/s/ Gary C. Kelly                       Vice President-Finance
- -----------------------------           (Chief Financial and Accounting Officer)
Gary C. Kelly                

/s/ Samuel E. Barshop                   Director
- -----------------------------
Samuel E. Barshop

/s/ Gene H. Bishop                      Director
- -----------------------------
Gene H. Bishop

/s/ C. Webb Crockett                    Director
- -----------------------------
C. Webb Crockett

/s/ William P. Hobby, Jr.               Director
- -----------------------------
William P. Hobby, Jr.

/s/ Travis C. Johnson                   Director
- -----------------------------
Travis C. Johnson

/s/ R.W. King                           Director
- -----------------------------
R. W. King

/s/ Walter M. Mischer, Sr.              Director
- -----------------------------
Walter M. Mischer, Sr.

/s/ June M. Morris                      Director
- -----------------------------
June M. Morris


                                       50

<PAGE>   52




                                           INDEX TO EXHIBITS


        3.1     Restated Articles of Incorporation of Southwest (incorporated by
                reference to Exhibit 4.1 to Southwest's Registration Statement
                on Form S-3 (File No. 33-52155)); Amendment to Restated Article
                of Incorporation of Southwest (incorporated by reference to
                Exhibit 4.1 to Southwest's Quarterly Report on Form 10-Q for the
                quarter ended June 30, 1996 (File No. 1-7259).

        3.2     Bylaws of Southwest, as amended through February 1994
                (incorporated by reference to Exhibit 3.2 to Southwest's Annual
                Report on Form 10-K for the year ended December 31, 1993 (File
                No. 1-7259)).

        4.1     Restated Credit Agreement dated May 6, 1997, between Southwest
                and Bank of America National Trust and Savings Association, and
                the other banks named therein, and such banks.

        4.2     Specimen certificate representing Common Stock of Southwest
                (incorporated by reference to Exhibit 4.2 to Southwest's Annual
                Report on Form 10-K for the year ended December 31, 1994 (File
                No. 1-7259)).

        4.3     Indenture dated as of December 1, 1985 between Southwest and
                MBank Dallas, N.A., Trustee, relating to an unlimited amount of
                Debt Securities (incorporated by reference to Exhibit 4.1 of
                Southwest's Current Report on Form 8-K dated February 26, 1986
                (File No. 1-7259)) and First Supplemental Indenture dated as of
                January 21, 1988, substituting MTrust Corp, National
                Association, as Trustee, thereunder (incorporated by reference
                to Exhibit 4.3 on Southwest's Annual Report on Form 10-K for the
                year ended December 31, 1987 (File 1-7259)).

        4.4     Amended and Restated Rights Agreement dated July 18, 1996
                between Southwest and Continental Stock Transfer & Trust
                Company, as Rights Agent (incorporated by reference to Exhibit
                1, Southwest's Registration Statement on Form 8-A/A dated August
                12, 1996 (File No. 1-7259)).

        4.5     Indenture dated as of June 20, 1991 between Southwest Airlines
                Co. and Bank of New York, successor to NationsBank of Texas,
                N.A. (formerly NCNB Texas National Bank), Trustee (incorporated
                by reference to Exhibit 4.1 to Southwest's Current Report on
                Form 8-K dated June 24, 1991 (File No. 1-7259)).

        4.6     Indenture dated as of February 25, 1997 between the Company and
                U.S. Trust Company of Texas, N.A. (incorporated by reference to
                Exhibit 4.1 to Southwest's Annual Report on Form 10-K for the
                year ended December 31, 1996 (File No. 1-7259)).

                Southwest is not filing any other instruments evidencing any
                indebtedness because the total amount of securities authorized
                under any single such instrument does not exceed 10% of its
                total consolidated assets. Copies of such instruments will be
                furnished to the Securities and Exchange Commission upon
                request.

        10.1    General Terms Agreement between CFM International, Inc. and
                Southwest (with all amendments through March 29, 1990) dated May
                28, 1981 (incorporated by reference to Exhibit 10.2 on
                Southwest's Annual Report on Form 10-K for the year ended
                December 31, 1989 (File No. 1-7259)); Amendments from November
                6, 1989 through March 29,

                                       E-1

<PAGE>   53



                1993 (incorporated by reference to Exhibit 10.2 on Southwest's
                Annual Report on Form 10-K for the year ended December 31, 1992
                (File No. 1-7259)); Amendments from March 29, 1993 through March
                29, 1994 (incorporated by reference to Exhibit 10.2 to
                Southwest's Annual Report on Form 10-K for the year ended
                December 31, 1993 (File No. 1-7259)); Amendment No. 7 and Letter
                Agreement No. 11, each dated as of January 19, 1994
                (incorporated by reference to Exhibit 10.2 to Southwest's Annual
                Report on Form 10-K for the year ended December 31, 1993 (File
                No. 1-7259)).

        10.2    Purchase Agreement No. 1810, dated January 19, 1994 between The
                Boeing Company and Southwest (incorporated by reference to
                Exhibit 10.4 to Southwest's Annual Report on Form 10-K for the
                year ended December 31, 1993 (File No. 1-7259)); Supplemental
                Agreement No. 1. (incorporated by reference to Exhibit 10.3 to
                Southwest's Annual Report on Form 10-K for the year ended
                December 31, 1996 (File No. 1-7259)).; Supplemental Agreements
                No. 2, 3 and 4.

                Pursuant to 17 CFR 240.24b-2, confidential information has been
                omitted and has been filed separately with the Securities and
                Exchange Commission pursuant to a Confidential Treatment
                Application filed with the Commission.

                The following exhibits filed under paragraph 10 of Item 601 are
                the Company's compensation plans and arrangements.

        10.3    Form of Executive Employment Agreement between Southwest and
                certain key employees pursuant to Executive Service Recognition
                Plan (incorporated by reference to Exhibit 28 to Southwest
                Quarterly Report on Form 10-Q for the quarter ended June 30,
                1987 (File No. 1-7259)).

        10.4    1992 stock option agreements between Southwest and Herbert D.
                Kelleher (incorporated by reference to Exhibit 10.8 to
                Southwest's Annual Report on Form 10-K for the year ended
                December 31, 1991 (File No. 1-7259)).

        10.5    1987 stock option agreement between Southwest and Herbert D.
                Kelleher (incorporated by reference to Exhibit 10.11 to
                Southwest's Annual Report on Form 10-K for the year ended
                December 31, 1987 (File No. 1-7259)).

        10.6    1996 employment contract between Southwest and Herbert D.
                Kelleher and related stock option agreements (incorporated by
                reference to Exhibit 10.8 to Southwest's Annual Report on Form
                10-K for the year ended December 31, 1996 (File No. 1-7259)).

        10.7    1991 Incentive Stock Option Plan (incorporated by reference to
                Exhibit 4.1 to Registration Statement on Form S-8 (File No.
                33-40652)).

        10.8    1991 Non-Qualified Stock Option Plan (incorporated by reference
                to Exhibit 4.2 to Registration Statement on Form S-8 (File No.
                33-40652)).

        10.9    1991 Employee Stock Purchase Plan as amended May 20, 1992
                (incorporated by reference to Exhibit 10.13 to Southwest's
                Annual Report on Form 10-K for the year ended December 31, 1992
                (File No. 1-7259)).

        10.10   Southwest Airlines Co. Profit Sharing Plan (incorporated by
                reference to Exhibit 10.13 to Southwest's Annual Report on Form
                10-K for the year ended December 31, 1991 (File No. 1-7259)).


                                       E-2

<PAGE>   54


        10.11   Southwest Airlines Co. 401(k) Plan (incorporated by reference to
                Exhibit 10.14 to Southwest's Annual Report on Form 10-K for the
                year ended December 31, 1991 (File No. 1-7259)).

        10.12   Southwest Airlines Co. 1995 SWAPA Non-Qualified Stock Option
                Plan (incorporated by reference to Exhibit 10.14 to Southwest's
                Annual Report on Form 10-K for the year ended December 31, 1994
                (File No. 1-7259)).

        10.13   1996 Incentive Stock Option Plan (incorporated by reference to
                Exhibit 4.1 to Registration Statement on Form S-8 (File No.
                333-20275)).

        10.14   1996 Non-Qualified Stock Option Plan (incorporated by reference
                to Exhibit 4.2 to Registration Statement on Form S-8 (File No.
                333-20275)).

        22      Subsidiaries of Southwest.

        23      Consent of Ernst & Young LLP, Independent Auditors.

        27      Financial Data Schedule.

        A copy of each exhibit may be obtained at a price of 15 cents per page,
$10.00 minimum order, by writing to: Director of Investor Relations, Southwest
Airlines Co., P.O. Box 36611, Dallas, Texas 75235-1611.





                                      E-3


<PAGE>   1
                                                                     EXHIBIT 4.1


================================================================================





          COMPETITIVE ADVANCE AND REVOLVING CREDIT FACILITY AGREEMENT

                                     among

                            SOUTHWEST AIRLINES CO.,

                            THE BANKS PARTY HERETO,

            BANK OF AMERICA NATIONAL TRUST AND SAVINGS ASSOCIATION,
                            as Documentation Agent,

                          NATIONSBANK OF TEXAS, N.A.,
                             as Syndication Agent,

                           THE CHASE MANHATTAN BANK,
                        as Auction Administration Agent,

                                      and

                   TEXAS COMMERCE BANK NATIONAL ASSOCIATION,
                            as Administrative Agent



                               As of May 6, 1997


================================================================================
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ARTICLE I - DEFINITIONS AND ACCOUNTING TERMS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
         Section 1.1      Certain Defined Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
         Section 2.1      Computation of Time Periods.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20

ARTICLE II - LOANS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
         Section 2.1      Commitments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
         Section 2.2      Competitive Bid Procedure.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  21
         Section 2.3      Committed Borrowing Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  25
         Section 2.4      Refinancings; Conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  26
         Section 2.5      Fees. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  27
         Section 2.6      Termination and Reduction of Commitments. . . . . . . . . . . . . . . . . . . . . . . . . .  28
         Section 2.7      Loans.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  28
         Section 2.8      Loan Accounts.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  30
         Section 2.9      Interest on Loans.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  31
         Section 2.10     Interest on Overdue Amounts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  32
         Section 2.11     Alternate Rate of Interest. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  32
         Section 2.12     Prepayment of Loans.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
         Section 2.13     Reserve Requirements; Change in
                          Circumstances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  34
         Section 2.14     Change in Legality. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  37
         Section 2.15     INDEMNITY.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  38
         Section 2.16     Pro Rata Treatment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  39
         Section 2.17     Sharing of Setoffs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  40
         Section 2.18     Payments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  41
         Section 2.19     Tax Forms.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  42
         Section 2.20     Calculation of LIBO Rates.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  43
         Section 2.21     Booking Loans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  43
         Section 2.22     Quotation of Rates. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  43

ARTICLE III - CONDITIONS OF LENDING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  43
         Section 3.1      Conditions Precedent to Initial
                          Borrowing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  43
         Section 3.2      Conditions Precedent to Each Committed
                          Borrowing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  44
         Section 3.3      Conditions Precedent to Each Competitive
                          Borrowing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  45
         Section 3.4      Legal Details.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  46

ARTICLE IV - REPRESENTATIONS AND WARRANTIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  46
         Section 4.1      Organization, Authority, and
                          Qualifications  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  46
         Section 4.2      Financial Statements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  47
         Section 4.3      Compliance with Agreement and Laws. . . . . . . . . . . . . . . . . . . . . . . . . . . . .  47
</TABLE>





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         Section 4.4      Authorization; No Breach; and Valid
                          Agreements  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  47
         Section 4.5      Litigation and Judgments  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  48
         Section 4.6      Ownership of Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  48
         Section 4.7      Taxes.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  48
         Section 4.8      Approvals Required. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  48
         Section 4.9      Business; Status as Air Carrier.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  49
         Section 4.10     ERISA Compliance.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  49
         Section 4.11     Insurance.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  49
         Section 4.12     Purpose of Loan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  49
         Section 4.13     Investment Company Act  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  49
         Section 4.14     General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  49

ARTICLE V - COVENANTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  50
         Section 5.1      Performance of Obligations  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  50
         Section 5.2      Compliance with Laws. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  50
         Section 5.3      Maintenance of Existence, Licenses and
                          Franchises; Compliance With Agreements. . . . . . . . . . . . . . . . . . . . . . . . . . .  50
         Section 5.4      Maintenance of Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  51
         Section 5.5      Maintenance of Books and Records. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  51
         Section 5.6      Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  52
         Section 5.7      Insurance.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  52
         Section 5.8      Appraisals.   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  52
         Section 5.9      Coverage Ratio  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  53
         Section 5.10     Reporting Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  53
         Section 5.11     Use of Proceeds.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  54
         Section 5.12     Restrictions on Sale-Leaseback
                          Transactions; Pool Assets.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  54
         Section 5.13     Restrictions on Liens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  57
         Section 5.14     Mergers and Dissolutions  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  60
         Section 5.15     Assignment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  61

ARTICLE VI - EVENTS OF DEFAULT; REMEDIES  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  61
         Section 6.1      Events of Default.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  61
         Section 6.2      Remedies Upon Default.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  63
         Section 6.3      Remedies in General.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  64

ARTICLE VII - THE AGENTS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  64
         Section 7.1      Authorization and Action  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  64
         Section 7.2      Agents' Reliance, Etc.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  65
         Section 7.3      Rights of Agents as Banks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  66
                                                                                                                         
                                                                                                                         
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         Section 7.4      Bank Credit Decision  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  66
         Section 7.5      AGENTS' INDEMNITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  67
         Section 7.6      Successor Administrative Agent. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  68
         Section 7.7      Successor Auction Administration Agent. . . . . . . . . . . . . . . . . . . . . . . . . . .  68
         Section 7.8      Successor Documentation Agent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  69
         Section 7.9      Notice of Default.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  70

ARTICLE VIII - MISCELLANEOUS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  71
         Section 8.1      Amendments, Etc.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  71
         Section 8.2      Notices, Etc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  72
         Section 8.3      No Waiver; Remedies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  73
         Section 8.4      Costs, Expenses and Taxes.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  73
         Section 8.5      INDEMNITY.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  74
         Section 8.6      Right of Setoff.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  74
         Section 8.7      GOVERNING LAW; VENUE; SERVICE OF PROCESS  . . . . . . . . . . . . . . . . . . . . . . . . .  75
         Section 8.8      Usury Not Intended. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  76
         Section 8.9      Survival of Representations and Warranties  . . . . . . . . . . . . . . . . . . . . . . . .  77
         Section 8.10     Binding Effect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  77
         Section 8.11     Successors and Assigns; Participations. . . . . . . . . . . . . . . . . . . . . . . . . . .  78
         Section 8.12     Independence of Covenants.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  82
         Section 8.13     Severability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  82
         Section 8.14     Entire Agreement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  82
         Section 8.15     Descriptive Headings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  83
         Section 8.16     Execution in Counterparts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  83
         Section 8.17     WAIVER OF JURY TRIAL  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  84


SCHEDULES

Location of Lending Office; Notice Information                                       Schedule I
Pool Assets                                                                          Schedule II

EXHIBITS

Form of Competitive Bid Request                                                      Exhibit A-1
Form of Notice of Committed Borrowing                                                Exhibit A-2
Form of Notice to Banks of Competitive
         Bid Request                                                                 Exhibit B
Form of Competitive Bid                                                              Exhibit C
Form of Competitive Note                                                             Exhibit D-1
Form of Committed Note                                                               Exhibit D-2
</TABLE>





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                                  (Continued)

<TABLE>
<S>                                                                                  <C>
Form of Company Counsel Opinion                                                      Exhibit E-1
Form of Agents' Counsel Opinion                                                      Exhibit E-2
Form of Administrative Questionnaire                                                 Exhibit F
Form of Financial Report Certificate                                                 Exhibit G
Form of Assignment and Acceptance                                                    Exhibit H
Form of Appraisal                                                                    Exhibit I
</TABLE>





                                      -iv-
<PAGE>   6

                            COMPETITIVE ADVANCE AND
                      REVOLVING CREDIT FACILITY AGREEMENT

         COMPETITIVE ADVANCE AND REVOLVING CREDIT FACILITY AGREEMENT dated as
of May 6, 1997, among SOUTHWEST AIRLINES CO., a Texas corporation (the
"Company"), the Banks, TEXAS COMMERCE BANK NATIONAL ASSOCIATION, a national
banking association, as administrative agent for the Banks (in such capacity,
the "Administrative Agent"), THE CHASE MANHATTAN BANK, a New York banking
corporation, as auction administration agent for the Banks (in such capacity,
the "Auction Administration Agent"), BANK OF AMERICA NATIONAL TRUST AND SAVINGS
ASSOCIATION, a national banking association, as documentation agent for the
Banks (in such capacity, the "Documentation Agent"), and NATIONSBANK OF TEXAS,
N.A., a national banking association, as syndication agent for the Banks (in
such capacity, the "Syndication Agent").

         The Company has requested the Banks to extend credit to the Company in
order to enable it to borrow on a revolving credit basis on and after the
Effective Date and at any time and from time to time prior to the Termination
Date (each as herein defined) a principal amount not in excess of $475,000,000
at any time outstanding.  The Company has also requested the Banks to provide a
procedure pursuant to which the Company may designate that all of the Banks be
invited to bid on an uncommitted basis on borrowings by the Company scheduled
to mature on or prior to the Termination Date.  The Banks are willing to extend
such credit to the Company on the terms and conditions herein set forth.
Accordingly, the Company, the Agents, and the Banks agree as follows:


                                   ARTICLE I

                        DEFINITIONS AND ACCOUNTING TERMS

         Section 1.1         Certain Defined Terms.  As used in this Agreement,
the following terms shall have the following meanings (such meanings to be
equally applicable to both the singular and plural forms of the terms defined):

         "Adjusted Pre-Tax Income" of any Person means, with respect to any
period, net income before taxes of such Person for such period, but excluding
(i) any gain or loss arising from the sale of capital assets other than capital
assets consisting of Aircraft, (ii) any





<PAGE>   7
gain or loss arising from any write-up or write-down of assets, (iii) income or
loss of any other Person, substantially all of the assets of which have been
acquired by such Person in any manner, to the extent that such income or loss
was realized by such other Person prior to the date of such acquisition, (iv)
net income or loss of any other Person (other than a Subsidiary) in which such
Person has an ownership interest, (v) the income or loss of any other Person to
which assets of such Person shall have been sold, transferred, or disposed of,
or into which such Person shall have merged, to the extent that such income or
loss arises prior to the date of such transaction, (vi) any gain or loss
arising from the acquisition of any securities of such Person, (vii) gains or
losses reported as extraordinary in accordance with GAAP not previously
excluded in clauses (i) through (vi), and (viii) the cumulative effect of
changes in accounting methods permitted by GAAP during such period.

         "Administrative Agent" is defined in the introduction to this
Agreement.

         "Administrative Questionnaire" means an Administrative Questionnaire
substantially in the form of Exhibit F hereto, which each Bank shall complete
and provide to the Administrative Agent.

         "Affiliate" means a Person that directly, or indirectly through one or
more intermediaries, controls or is controlled by or is under common control
with another Person.

         "Agents" means the Administrative Agent, the Auction Administration
Agent, the  Documentation Agent and the Syndication Agent.

         "Agreed Maximum Rate" means, for any date, the Alternate Base Rate
plus 1% per annum.

         "Agreement" means this Competitive Advance and Revolving Credit
Facility Agreement, as the same may be amended, supplemented, or modified from
time to time.

         "Aircraft" means, collectively, airframes and aircraft engines now
owned or hereafter acquired by the Company, together with all appliances,
equipment, instruments, and accessories (including radio and radar) from time
to time belonging to, installed in, or appurtenant to such airframes and
aircraft engines; provided, however, the term "Aircraft" shall not include
airframes and engines leased by the Company.





                                      -2-
<PAGE>   8
         "Aircraft Rentals" means the operating expense attributable to rental
of aircraft, calculated in accordance with the line item described as such in
the Current Financials.

         "Alternate Base Loan" means any Committed Loan with respect to which
the Company shall have selected an interest rate based on the Alternate Base
Rate in accordance with the provisions of Article II.

         "Alternate Base Rate" means, for any date, a rate per annum (rounded
upwards, if not already a whole multiple of 1/100 of 1%, to the next higher
1/100 of 1%) equal to the greater of (i) the Prime Rate in effect on such day,
and (ii) the Federal Funds Effective Rate in effect for such day plus 1/2 of
1%.  For purposes hereof, the term "Prime Rate" means, as of a particular date,
the prime rate most recently announced by TCB and thereafter entered in the
minutes of TCB's Loan and Discount Committee, automatically fluctuating upward
and downward with and at the time specified in each such announcement without
special notice to the Company or any other Person, which prime rate may not
necessarily represent the lowest or best rate actually charged to a customer.
"Federal Funds Effective Rate" means, for any period, a fluctuating interest
rate per annum equal for each day during such period to the weighted average of
the rates on overnight federal funds transactions with members of the Federal
Reserve System arranged by federal funds brokers, as published on the
succeeding Business Day by the Federal Reserve Bank of New York, or, if such
rate is not so published for any day which is a Business Day, the average of
the quotations for the day of such transactions received by the Administrative
Agent from three federal funds brokers of recognized standing selected by it.
Any change in the Alternate Base Rate due to a change in the Federal Funds
Effective Rate shall be effective on the effective date of such change in the
Federal Funds Effective Rate.  If for any reason the Administrative Agent shall
have determined (which determination shall be conclusive absent manifest error)
that it is unable to ascertain the Federal Funds Effective Rate for any reason,
including, without limitation, the inability of the Administrative Agent to
obtain sufficient quotations or publications in accordance with the terms
hereof, the Alternate Base Rate shall be the Prime Rate until the circumstances
giving rise to such inability no longer exist.





                                      -3-
<PAGE>   9
         "Applicable Law" means the Laws of the United States of America
applicable to contracts made or performed in the State of Texas, including,
without limitation, 12 U.S.C. Section  86(a), as amended, and any other statute
of the United States of America now or at any time hereafter prescribing
maximum rates of interest on loans, advances, and extensions of credit, and the
Laws of the State of Texas, including, without limitation, Article 5069-1.04
and 5069-1.07(a), Title 79, Revised Civil Statutes of Texas, 1925 (Art.
5069-1.04 and Art. 5069-1.07(a), Vernon's Annotated Texas Statutes), as amended
("Article 1.04"), and any other statute of, or any provisions of the
Constitution of, the State of Texas now or at any time hereafter prescribing
maximum rates of interest on loans, advances, and extensions of credit.

         "Applicable Lending Office" means, with respect to each Bank, such
Bank's Domestic Lending Office in the case of an Alternate Base Loan or a Fixed
Rate Loan and such Bank's Eurodollar Lending Office in the case of a Eurodollar
Loan.

         "Applicable Margin" means, as of any date, in the case of Eurodollar
Loans that are Committed Loans, a percentage per annum determined by reference
to the Public Debt Rating in effect on such date as set forth below:


<TABLE>
<CAPTION>
==============================================================
                                     Applicable Margin for
  Public Debt Rating               Eurodollar Loans that are
     S&P/Moody's                        Committed Loans
- --------------------------------------------------------------
  <S>                                        <C>
  A/A2 or better                             .155%
- --------------------------------------------------------------
  A-/A3                                      .17%
- --------------------------------------------------------------
  BBB+/Baa1                                  .20%
- --------------------------------------------------------------
  BBB/Baa2                                   .225%
- --------------------------------------------------------------
  BBB-/Baa3                                  .30%
- --------------------------------------------------------------
  BB+/Ba1 or below                           .50%
==============================================================
</TABLE>

For purposes of determining the Applicable Margin on any date, the Public Debt
Rating shall be determined as set forth in the definition of the term Public
Debt Rating.





                                      -4-
<PAGE>   10
         "Appraisal" means a "desk-top" appraisal report substantially in the
form of Exhibit I, which will not include physical inspection of aircraft,
engines or maintenance records and will assume the equipment is half life in
its maintenance cycle, dated the date of delivery thereof to the Banks pursuant
to the terms of this Agreement, by one or more independent appraisal firms of
recognized national standing selected by the Company (such firm to be
reasonably satisfactory, at the time of such Appraisal, to the Administrative
Agent) setting forth the fair market value, as determined in accordance with
the definition of "fair market value" promulgated by the International Society
of Transport Aircraft Trading, as of the date of such appraisal, of each Pool
Asset or a proposed Pool Asset, as the case may be.

         "Appraisal Delivery Date" means (a) the Asset Pool Date, (b) each date
of replacement, removal or addition of any Pool Assets, and (c) if no Appraisal
of all of the Pool Assets shall have been provided in any two-year period, at
the end of each such two-year period.

         "Appraised Value" means, as of any date of determination, the
aggregate fair market value as of such date of each Pool Asset or proposed Pool
Asset, as the case may be, as provided in the most recently delivered
Appraisal.

         "Article 1.04" is defined in the definition of the term Applicable
Law.

         "Asset Pool Date" means the earlier of (a) the termination of the Bond
Indenture or (b) February 15, 1998.

         "Assignment and Acceptance" is defined in Section 8.11(c).

         "Auction Administration Agent " is defined in the introduction to this
Agreement.

         "Auditors" means independent certified public accountants of
recognized national standing selected by the Company.

         "Banks" means those banks signatory hereto and other banks which from
time to time become party hereto pursuant to the provisions of this Agreement.





                                      -5-
<PAGE>   11
         "B of A" means Bank of America National Trust and Savings Association.

         "Board" means the Board of Governors of the Federal Reserve System of
the United States.

         "Bond Indenture" means the Indenture dated December 1, 1985, between
the Company and TCB, as trustee thereunder.

         "Borrowing" means a Competitive Borrowing or a Committed Borrowing.

         "Borrowing Date" means the Business Day upon which the proceeds of any
Borrowing are to be made available to the Company.

         "Business Day" means a day when the Agents and each Bank's Applicable
Lending Office are open for business, other than a Saturday or Sunday, and if
the applicable Business Day relates to any Eurodollar Loan, a day on which
dealings in dollar deposits are carried on in the Eurodollar Interbank Market
and commercial banks are open for domestic or international business in London,
England, in New York, New York, and in Houston, Texas.

         "Chase" means The Chase Manhattan Bank.

         "Collateral Coverage Test" means, on any date, the requirement that
the Appraised Value of the Pool Assets on such date shall not be less than an
amount equal to 1.5 times the sum of the total Commitments on such date (or,
after termination of the Commitments, the sum of the aggregate amount of Loans
outstanding).

         "Commitment" means, with respect to each Bank, the amount set forth
opposite the name of such Bank on the signature pages hereof, and, if
applicable, amendments hereto, as such amount may be permanently terminated or
reduced from time to time pursuant to Section 2.6, Section 2.13(d) and Section
6.2, and as such amount may be increased or reduced from time to time by
assignment or assumption pursuant to Section 2.13(d) and Section 8.11(c).  The
Commitments shall automatically and permanently terminate on the Termination
Date.

         "Committed Borrowing" means a borrowing consisting of simultaneous
Committed Loans from each of the Banks distributed ratably among the Banks in
accordance with their respective Commitments.





                                      -6-
<PAGE>   12
         "Committed Loan" means a loan by a Bank to the Company pursuant to
Section 2.1, and shall be either a Eurodollar Loan or an Alternate Base Loan.

         "Committed Note" means a promissory note which a Bank may require the
Company to execute in accordance with Section 2.8(b), payable to the order of
such Bank, in substantially the form of Exhibit D-2 hereto, with the blanks
appropriately completed, to evidence the aggregate indebtedness of the Company
to such Bank resulting from the Committed Loans made by such Bank to the
Company, together with all modifications, extensions, renewals, and
rearrangements thereof.

         "Communications" is defined in Section 8.2.

         "Company" is defined in the introduction to this Agreement.

         "Competitive Bid" means an offer by a Bank to make a Competitive Loan
pursuant to Section 2.2.

         "Competitive Bid Rate" means, as to any Competitive Bid made by a Bank
pursuant to Section 2.2(b), (i) in the case of a Eurodollar Loan, the Margin
(which will be added to or subtracted from the LIBO Rate), and (ii) in the case
of a Fixed Rate Loan, the fixed rate of interest, in each case, offered by the
Bank making such Competitive Bid.

         "Competitive Bid Request" means a request for Competitive Bids made
pursuant to Section 2.2(a) substantially in the form of Exhibit A-1.

         "Competitive Borrowing" means a borrowing consisting of a single
Competitive Loan from a Bank or simultaneous Competitive Loans from one or more
of the Banks, in each case, whose Competitive Bid as all or as a part of such
Borrowing, as the case may be, has been accepted by the Company under the
bidding procedure described in Section 2.2.

         "Competitive Loan" means a loan from a Bank to the Company pursuant to
the bidding procedure described in Section 2.2, and shall be either a
Eurodollar Loan or a Fixed Rate Loan.





                                      -7-
<PAGE>   13
         "Competitive Note" means a promissory note which a Bank may require
the Company to execute in accordance with Section 2.8(b), payable to the order
of such Bank, in substantially the form of Exhibit D-1 hereto, with the blanks
appropriately completed, to evidence the aggregate indebtedness of the Company
to such Bank resulting from the Competitive Loans made by such Bank to the
Company, together with all modifications, extensions, renewals, and
rearrangements thereof.

         "Competitive Reduction" is defined in Section 2.1.

         "Consolidated Long-Term Debt" means, as of any date, all consolidated
Debt of the Company and its Subsidiaries which is classified as "long term" in
accordance with GAAP, together with the aggregate of all portions of
Consolidated Long-Term Debt classified as "current maturities" in accordance
with GAAP.

         "Consolidated Net Tangible Assets" means the total amount of assets
appearing on the Company's consolidated balance sheet, less, without
duplication, (i) all current liabilities (excluding any thereof which are
extendible or renewable by their terms or replaceable or refundable pursuant to
enforceable commitments at the option of the obligor thereon without requiring
the consent of the obligee to a time more than twelve months after the time as
of which the amount thereof is being computed and excluding current maturities
of Consolidated Long-Term Debt); (ii) all reserves for depreciation and other
asset valuation reserves but excluding any reserves for deferred federal income
Tax arising from accelerated amortization or otherwise; (iii) all goodwill,
trademarks, trade names, patents, unamortized debt discount and expense, and
other like intangible assets carried as an asset on said balance sheet; and
(iv) all appropriate adjustments for minority interests of other Persons
holding common stock in any Subsidiary.  Consolidated Net Tangible Assets shall
be determined in accordance with GAAP and as of a date not more than ninety
days prior to the happening of the event for which such determination is being
made.

         "Coverage Ratio" means, as of any date, the ratio of (i) for the four
fiscal quarter period for which the Company's annual or quarterly Financial
Statements have been most recently required to have been delivered pursuant to
Section 5.10(a) and Section 5.10(b), the Company's and its Subsidiaries'
consolidated Adjusted Pre-Tax Income, plus Aircraft Rentals, plus consolidated
Net Interest Expense, depreciation, and amortization, and minus





                                      -8-
<PAGE>   14
cash dividends paid by the Company, to (ii) current maturities of Consolidated
Long-Term Debt, consolidated Net Interest Expense, and Aircraft Rentals paid
within such four-quarter period.

         "Current Financials" means the Financial Statements of the Company and
its Subsidiaries for the fiscal year ended December 31, 1996.

         "Debt" means, without duplication, (a) any indebtedness for borrowed
money or incurred in connection with the acquisition or construction of any
Property, (b) any obligation under any lease of any Property entered into after
the date of this Agreement which is required under GAAP to be capitalized on
the lessee's balance sheet, and (c) any direct or indirect guarantee or
assumption of indebtedness or obligations described in clause (a) or (b),
including without limitation any agreement to provide funds to or otherwise
assure the ability of an obligor to repay indebtedness or meet its obligations.

         "Debtor Relief Laws" means the Bankruptcy Code of the United States of
America and all other applicable liquidation, conservatorship, bankruptcy,
moratorium, rearrangement, receivership, insolvency, reorganization, fraudulent
transfer or conveyance, suspension of payments, or similar Laws from time to
time in effect affecting the Rights of creditors generally.

         "Default" means the occurrence of any event which with the giving of
notice or the passage of time or both would become an Event of Default.

         "Documentation Agent" is defined in the introduction to this
Agreement.

         "dollars" and the symbol "$" mean the lawful currency of the United
States of America.

         "Domestic Lending Office" means, with respect to any Bank, the office
of such Bank specified as its "Domestic Lending Office" on Schedule I to this
Agreement or such other office of such Bank as such Bank may from time to time
specify to the Company, the Administrative Agent and the Auction Administration
Agent.

         "Effective Date" means the date on which the conditions set forth in
Section 3.1 are first met.





                                      -9-
<PAGE>   15
         "Eligible Assignee" means (i) a commercial bank organized under the
Laws of the United States, or any state thereof, and having total assets in
excess of $1,000,000,000; (ii) a commercial bank organized under the Laws of
France, Germany, the Netherlands or the United Kingdom, or under the Laws of a
political subdivision of any such country, and having total assets in excess of
$1,000,000,000; provided that such bank is acting through a branch or agency
located in such country or the United States; and (iii) a commercial bank
organized under the Laws of any other country which is a member of the OECD, or
under the Laws of a political subdivision of any such country, and having total
assets in excess of $1,000,000,000; provided that such bank is acting through a
branch or agency located in the United States.

         "ERISA" means the Employee Retirement Income Security Act of 1974, as
amended from time to time, and the regulations promulgated thereunder.

         "Eurocurrency Liabilities" is defined in Regulation D.

         "Eurodollar Interbank Market" means the London eurodollar interbank
market.

         "Eurodollar Lending Office" means, with respect to each Bank, the
branches or affiliates of such Bank which such Bank has designated on Schedule
I as its "Eurodollar Lending Office" or may hereafter designate from time to
time as its "Eurodollar Lending Office" by notice to the Company, the
Administrative Agent and the Auction Administration Agent.

         "Eurodollar Loan" means any loan with respect to which the Company
shall have selected an interest rate based on the LIBO Rate in accordance with
the provisions of Article II.

         "Event of Default" means any of the events described in Article VI,
provided there has been satisfied any requirement in connection therewith for
the giving of notice, lapse of time, or happening of any further condition,
event, or act.

         "Execution Date" means the date of execution and delivery of the
Agreement by all of the parties hereto.

         "Facility Fee" is defined in Section 2.5.





                                      -10-
<PAGE>   16
         "Facility Fee Percentage" means, as of any date, a percentage per
annum determined by reference to the Public Debt Rating in effect on such date
as set forth below:

<TABLE>
<CAPTION>
        ================================================================================
                     Public Debt Rating
                        S&P/Moody's                                   Percentage
                 <S>                                                 <C>
        --------------------------------------------------------------------------------
                 A/A2 or better                                           .07%
        --------------------------------------------------------------------------------
                 A-/A3                                                    .08%
        --------------------------------------------------------------------------------
                 BBB+/Baa1                                                .10%
        --------------------------------------------------------------------------------
                 BBB/Baa2                                                 .125%
        --------------------------------------------------------------------------------
                 BBB-/Baa3                                                .15%
        --------------------------------------------------------------------------------
                 BB+/Ba1 or below                                         .25%
        ================================================================================
</TABLE>

For purposes of determining the Facility Fee Percentage on any date, the Public
Debt Rating shall be determined as set forth in the definition of the term
Public Debt Rating.

         "Federal Funds Effective Rate" is defined in the definition of the
term Alternate Base Rate.

         "Financial Report Certificate" means a certificate substantially in
the form of Exhibit G.

         "Financial Statements" means balance sheets, income and loss
statements, statements of stockholders' equity, and statements of cash flow
prepared in accordance with GAAP and in comparative form to the corresponding
period of the preceding fiscal year.

         "Fixed Rate Loan" means any Competitive Loan made by a Bank pursuant
to Section 2.2 based upon an actual percentage rate per annum offered by such
Bank, expressed as a decimal (to no more than four decimal places), and
accepted by the Company.

         "GAAP" means generally accepted accounting principles of the
Accounting Principles Board of the American Institute of Certified Public
Accountants and the Financial Accounting Standards Board which are applicable
as of the date in question for the purpose of the definition of "Financial
Statements."

         "Highest Lawful Rate" means at the particular time in question the
maximum rate of interest which, under Applicable Law, the Banks are then
permitted to charge the Company on the Obligation.  If the maximum rate of
interest which, under Applicable Law, the Banks are





                                      -11-
<PAGE>   17
permitted to charge the Company on the Obligation shall change after the date
hereof, the Highest Lawful Rate shall be automatically increased or decreased,
as the case may be, as of the effective time of such change without notice to
the Company.  For purposes of determining the Highest Lawful Rate under
Applicable Law, the applicable rate ceiling shall be (i) the indicated rate
ceiling described in and computed in accordance with the provisions of Section
(a)(1) of Article 1.04; or (ii) provided notice is given as required in Section
(h)(1) of Article 1.04, either the annualized ceiling or quarterly ceiling
computed pursuant to Section (d) of Article 1.04; provided, however, that at
any time such ceiling shall be less than 18% per annum or more than 24% per
annum, the provisions of Section (b)(1) and (2) of Article 1.04 shall control
for purposes of such determination, as applicable.

         "Interest Payment Date" means (i) with respect to any Alternate Base
Loan, each Quarterly Payment Date, or if earlier the Termination Date or the
date of prepayment of such Loan or conversion of such Loan to a Eurodollar
Loan, (ii) with respect to any Eurodollar Loan, the last day of the Interest
Period applicable thereto and, in addition in the case of a Eurodollar Loan
with an Interest Period longer than three months each day that would have been
the Interest Payment Date for such Loan had successive Interest Periods of
three months been applicable to such Loan, and (iii) in the case of a Fixed
Rate Loan, the last day of the Interest Period applicable thereto and, in the
case of a Fixed Rate Loan with an Interest Period of more than 90 days, on the
numerically corresponding day which occurs during such Interest Period every
three months from the first day of such Interest Period (or, if there is no
such corresponding day in any such month, the last day of such month).

         "Interest Period" means:

(i)      as to any Eurodollar Loan, the period commencing on the date of such
Loan and ending on the numerically corresponding day (or if there is no
corresponding day, the last day) in the calendar month that is one, two, three,
six, nine, or twelve months thereafter, as the Company may elect; and

(ii)     as to any Fixed Rate Loan, the period commencing on the date of such
Loan and ending on the date specified in the Competitive Bid in which the offer
to make the Fixed Rate Loan was extended;





                                      -12-
<PAGE>   18
provided, however, that each such period shall have a duration of not less than
seven calendar days nor more than 360 calendar days;

provided, further, that (x) if any Interest Period would end on a day which
shall not be a Business Day, such Interest Period shall be extended to the next
succeeding Business Day unless, with respect to Eurodollar Loans only, such
next succeeding Business Day would fall in the next calendar month, in which
case such Interest Period shall end on the next preceding Business Day, and (y)
no Interest Period may be selected that ends later than the Termination Date.
Interest shall accrue from and including the first day of an Interest Period to
but excluding the last day of such Interest Period.

         "Laws" means all applicable statutes, laws, treaties, ordinances,
rules, regulations, orders, writs, injunctions, decrees, judgments, or opinions
of any Tribunal.

         "LIBO Rate" means, for any Eurodollar Loan for any Interest Period
therefor, the rate (rounded upwards, if not already a whole multiple of 1/100
of 1%, to the next higher 1/100 of 1%) equal to the annual rate of interest
shown on the Dow Jones Telerate Screen (Page 3750) for a period equal to such
Interest Period or, if the Dow Jones Telerate Screen is not available, the
annual rate of interest at which dollar deposits approximately equal in
principal amount to TCB's portion of the Committed Borrowing of which such
Eurodollar Loan forms a part (or, in the case of a Competitive Loan, a
principal amount which would have been TCB's portion of the Committed Borrowing
of which such Eurodollar Loan would have formed a part had such Competitive
Borrowing been a Committed Borrowing) and with a maturity equal to the
applicable Interest Period are offered in immediately available funds to the
principal office of TCB in London, England (or if TCB does not at the time any
such determination is made maintain an office in London, England, the principal
office of any Affiliate of TCB in London, England), in the Eurodollar Interbank
Market, at 11:00 a.m., London time (or as soon thereafter as practicable), two
Business Days before the first day of such Interest Period.  The LIBO Rate for
the Interest Period for each Eurodollar Loan comprising part of the same
Borrowing shall be determined by the Administrative Agent.

         "Lien" means any mortgage, lien, pledge, adverse claim, charge,
security interest or other encumbrance in or on, or any interest or title of
any vendor, lessor, lender or other secured





                                      -13-
<PAGE>   19
party to or of any Person under any conditional sale or other title retention
agreement or lease with respect to, any Property or asset of such Person.

         "Litigation" means any action conducted, pending, or threatened by or
before any Tribunal.

         "Loan" means a Competitive Loan, a Committed Loan, a Eurodollar Loan,
a Fixed Rate Loan, or an Alternate Base Loan.

         "Loan Papers" means (i) this Agreement, certificates delivered
pursuant to this Agreement, and exhibits and schedules hereto, (ii) any notes,
security documents, guaranties, and other agreements in favor of the Agents and
Banks, or any or some of them, ever delivered in connection with this
Agreement, and (iii) all renewals, extensions, or restatements of, or
amendments or supplements to, any of the foregoing.

         "Majority Banks" means at any time (i) the Majority Committed Banks
and (ii) Banks holding at least 66-2/3% of the then aggregate unpaid principal
amount of the Competitive Loans.

         "Majority Committed Banks" means at any time Banks holding at least
66-2/3% of the then aggregate unpaid principal amount of the Committed Loans or
if no Committed Loans are outstanding, Banks having at least 66-2/3% of the
available Commitments (determined without considering the effect of any
Competitive Reduction).

         "Margin" means, as to any Competitive Bid made by a Bank relating to a
Eurodollar Loan, the margin (expressed as a percentage rate per annum in the
form of a decimal to no more than four decimal places) to be added to or
subtracted from the LIBO Rate for any such Loan in order to determine the
interest rate acceptable to such Bank with respect to such Eurodollar Loan.

         "Margin Stock" means "margin stock" within the meaning of Regulations
G, T, U, or X of the Board.

         "Material Adverse Change" or "Material Adverse Effect" means an act,
event or circumstance which materially and adversely affects the business,
financial condition or results of operations of the Company and its
Subsidiaries on a consolidated basis or the ability of the Company to perform
its obligations under this Agreement or any Loan Paper.





                                      -14-
<PAGE>   20
         "Material Subsidiary" means, at any time, any Subsidiary of the
Company having at such time either (i) total assets, as of the last day of the
preceding fiscal quarter, having a net book value greater than or equal to 10%
of the total assets of the Company and all of its Subsidiaries on a
consolidated basis or (ii) Adjusted Pre-Tax Income, as of the last day of the
preceding fiscal quarter, greater than or equal to 10% of the total Adjusted
Pre-Tax Income of the Company and all of its Subsidiaries on a consolidated
basis.

         "Moody's" means Moody's Investor Service, Inc.

         "NationsBank" means NationsBank of Texas, N.A.

         "Net Interest Expense" means interest expense minus interest income,
excluding in either case capitalized interest, but including payments in the
nature of interest under capital leases if and to the extent characterized as
such in accordance with GAAP.

         "Note" means a Competitive Note or a Committed Note.

         "Notice of Committed Borrowing" is defined in Section 2.3.

         "Obligation" means all present and future indebtedness, obligations,
and liabilities, and all renewals, extensions, and modifications thereof, owed
to the Agents and Banks, or any or some of them, by the Company, arising
pursuant to any Loan Paper, together with all interest thereon and costs,
expenses, and reasonable attorneys' fees incurred in the enforcement or
collection thereof.

         "OECD" means the Organization for Economic Cooperation and Development
as constituted on the date hereof (excluding Mexico, Poland and the Czech
Republic).

         "Officer's Certificate" means a certificate signed in the name of the
Company by either its Chairman, one of its Vice Chairmen, its President, one of
its Vice Presidents, its Treasurer, or its Assistant Treasurer, in each case
without personal liability.

         "Original Termination Date" means May 6, 2002.

         "Permitted Liens" means:  (a) Liens for taxes, assessments and
governmental charges or levies which either are not yet due and payable or are
being contested in good faith by appropriate





                                      -15-
<PAGE>   21
proceedings and for which adequate reserves are established in accordance with
GAAP; (b) Liens securing judgments, but only to the extent, for an amount and
for a period not resulting in an Event of Default under Section 6.1(d); (c)
Liens arising under this Agreement; (d) Liens constituting normal operational
usage of the affected Property, including charter, third party maintenance,
leasing, pooling or interchange thereof; and (e) Liens imposed by law such as
materialmen's, mechanics', carriers', workmen's and repairmen's Liens and other
similar Liens arising in the ordinary course of business securing obligations
that (i) are not overdue for a period of more than 30 days, provided that no
enforcement, collection, execution, levy or foreclosure proceeding shall have
been commenced with respect thereto, or (ii) are being contested in good faith
and for which adequate reserves are established in accordance with GAAP.

         "Person" means and includes an individual, partnership, joint venture,
corporation, trust, limited liability company or other entity, Tribunal,
unincorporated organization, or government, or any department, agency, or
political subdivision thereof.

         "Plan" means any plan defined in Section 4021(a) of ERISA in respect
of which the Company is an "employer" or a "substantial employer" as such terms
are defined in ERISA.

         "Pool Assets" means assets of the Company listed on Schedule II (which
Schedule shall be prepared by the Company, shall be reasonably satisfactory to
the Majority Banks, and shall be delivered to the Administrative Agent prior to
the Asset Pool Date), to the extent modified pursuant to Section 5.12(b) and
shall include only Stage 3 Equipment owned legally by the Company.

         "Prime Rate" is defined in the definition of the term Alternate Base
Rate.

         "Principal Office" of the Administrative Agent means 1111 Fannin St.,
9th Floor, MS46, Houston, Texas  77002, or such other office as the
Administrative Agent may hereafter designate from time to time as its
"Principal Office" by notice to the Company, the Banks and the Auction
Administration Agent.

         "Property" means all types of real, personal, tangible, intangible, or
mixed property.





                                      -16-
<PAGE>   22
         "Public Debt Rating" means, as of any date, the rating that has been
most recently announced by S&P and Moody's for that class of non-credit
enhanced, senior unsecured debt with an original term of longer than one year
issued by the Company which has the lowest rating of all classes of non-credit
enhanced, senior unsecured debt with an original term of longer than one year
issued by the Company.  For purposes of the foregoing, (a) if only one of S&P
and Moody's shall have in effect a Public Debt Rating, the Applicable Margin
and the Facility Fee Percentage shall be determined by reference to the
available rating; (b) if the ratings established by S&P and Moody's shall fall
within different levels, the Applicable Margin and the Facility Fee Percentage
shall be based upon the higher rating, except that if the difference is two or
more levels, the Applicable Margin and Facility Fee Percentage shall be based
on the rating that is one level below the higher rating; (c) if any rating
established by S&P or Moody's shall be changed, such change shall be effective
as of the date on which such change is first announced publicly by the rating
agency making such change; (d) if S&P or Moody's shall change the basis on
which ratings are established, each reference to the Public Debt Rating
announced by S&P or Moody's, as the case may be, shall refer to the then
equivalent rating by S&P or Moody's, as the case may be; (e) if neither S&P nor
Moody's shall have in effect a Public Debt Rating but at least one of S&P and
Moody's has in effect a rating for any class of senior secured debt with an
original term of longer than one year issued by the Company, the Applicable
Margin and Facility Fee Percentage shall be determined by reference to a rating
that is two levels lower than the rating that has been most recently announced
by S&P and Moody's for such class of debt; and (f) if neither S&P nor Moody's
shall have in effect either a Public Debt Rating or a rating for any class of
senior secured debt with an original term of longer than one year issued by the
Company, the Applicable Margin and the Facility Fee Percentage shall be set in
accordance with the lowest level rating and highest percentage rate set forth
in the respective tables in the definitions of "Applicable Margin" and
"Facility Fee Percentage", as the case may be.

         "Quarterly Payment Date" means the 15th day of each March, June,
September and December of each year, the first of which shall be the first such
day after the Effective Date.

         "Register" is defined in Section 8.11(e).





                                      -17-
<PAGE>   23
         "Regulation D" means Regulation D of the Board, as the same is from
time to time in effect, and all official rulings and interpretations thereunder
or thereof.

         "Regulatory Change" means, with respect to any Bank, (a) any adoption
or change after the Execution Date of or in United States federal, state or
foreign laws, rules, regulations (including Regulation D) or guidelines
applying to a class of banks including such Bank, (b) the adoption or making
after the Execution Date of any interpretations, directives or requests
applying to a class of banks including such Bank of or under any United States
federal, state or foreign laws, rules, regulations or guidelines (whether or
not having the force of law) by any Tribunal, monetary authority, central bank,
or comparable agency charged with the interpretation or administration thereof,
or (c) any change in the interpretation or administration of any United States
federal, state or foreign laws, rules, regulations or guidelines applying to a
class of banks including such Bank by any Tribunal, monetary authority, central
bank, or comparable agency charged with the interpretation or administration
thereof.

         "Reserve Percentage" of any Bank for the Interest Period for any
Eurodollar Loan means the reserve percentage applicable during such Interest
Period under regulations issued from time to time by the Board (or if more than
one such percentage shall be so applicable, the daily average of such
percentages for those days in such Interest Period during which any such
percentage shall be so applicable) for determining the maximum reserve
requirement (including, without limitation, any marginal reserve requirement)
for such Bank with respect to liabilities or assets consisting of or including
Eurocurrency Liabilities having a term equal to such Interest Period.

         "Rights" means rights, remedies, powers, and privileges.

         "S&P" means Standard & Poor's Ratings Services, a division of The
McGraw-Hill Companies, Inc.

         "Sale-Leaseback Debt" means, as to any particular lease entered into
in a Sale-Leaseback Transaction, at any date as of which the amount thereof is
to be determined, the total net amount of rent required to be paid under such
lease during the remaining term thereof, discounted from the respective due
dates thereof to such date at the rate per annum which would then be used to





                                      -18-
<PAGE>   24
determine the lease classification under GAAP.  The net amount of rent required
to be paid under any such lease for any such period shall be the aggregate
amount of the rent payable by the lessee with respect to such period after
excluding amounts required to be paid on account of maintenance and repairs,
insurance, taxes, assessments, water rates, and similar charges.  The term
"Sale-Leaseback Debt" shall exclude any part thereof representing any
extension, renewal, or replacement (or successive extensions, renewals, or
replacements) of Debt secured by any Lien existing on the date hereof or any
Lien referred to in clauses (l) through (8) inclusive of Section 5.13(a),
provided that the Sale-Leaseback Transaction resulting in such Sale-Leaseback
Debt shall be limited to all or a part of the Property (plus improvements and
construction on such Property) which was subject to the Lien securing the Debt
so extended, renewed, or replaced.

         "Sale-Leaseback Transaction" means any sale by the Company or any of
its Subsidiaries to any Person (other than the Company or another of its
Subsidiaries) of any Property owned by the Company or such Subsidiary, which
sale occurs more than 270 days after the later of the acquisition, completion
of construction, or commencement of commercial operation of such Property by
the Company or such Subsidiary, if, as part of the same transaction or series
of transactions, the Company or any of its Subsidiaries shall lease as lessee
the same Property or other substantially equivalent Property which it intends
to use for substantially the same purposes.

         "Stage 3 Airframes" and "Stage 3 Engines" mean airframes or engines,
respectively, owned by the Company and qualifying as Stage 3 airplanes, as set
forth in Federal Aviation Regulation 36.1(f)(6), 14 C.F.R. Section 36.1 (f)(6)
or any successor regulation, as amended; and "Stage 3 Engines" also include
spare engines which are suitable for use on Stage 3 Airframes and are being
maintained according to the Company's normal and customary standards.

         "Stage 3 Equipment" means Stage 3 Airframes and not less than two nor
more than four Stage 3 Engines per Stage 3 Airframe.

         "Stated Rate" is defined in Section 8.8.

         "Subsidiary" of a Person means any entity of which an aggregate of
more than 50% (in number of votes) of the stock (or equivalent interests) is
owned of record or beneficially, directly or indirectly, by such Person.





                                      -19-
<PAGE>   25
         "Syndication Agent" is defined in the introduction to this Agreement.

         "Taxes" means all taxes, assessments, fees, or other similar charges
at any time imposed by any Laws or Tribunal.

         "TCB" means Texas Commerce Bank National Association.

         "Termination Date" means, at any time, the Original Termination Date
or the earlier date of termination in whole of the Total Commitment pursuant to
Section 2.6 or Section 6.2.

         "Total Commitment" means at any time the aggregate amount of the
Banks' Commitments, as in effect at such time.

         "Tribunal" means any municipal, state, commonwealth, federal, foreign,
territorial, or other court, governmental body, subdivision, agency,
department, commission, board, bureau, or instrumentality.

         "Type" refers to the distinction between Committed Loans that are
Alternate Base Loans and Committed Loans that are Eurodollar Loans.

         "United States" and "U.S." each means United States of America.

         Section 2           Computation of Time Periods.  In this Agreement in
the computation of periods of time from a specified date to a later specified
date, the word "from" means "from and including" and the words "to" and "until"
each means "to but excluding."

                                   ARTICLE I

                                     LOANS

         Section 2.1         Commitments.  Subject to the terms and conditions
and relying upon the representations and warranties herein set forth, each
Bank, severally and not jointly, agrees to make revolving credit loans to the
Company, at any time and from time to time on and after the Effective Date and
until the earlier





                                      -20-
<PAGE>   26
of the Termination Date and the termination of the Commitment of such Bank in
accordance with the terms hereof.  Notwithstanding the foregoing, (a) the
aggregate principal amount at any time outstanding of all Committed Loans of a
Bank shall not exceed such Bank's Commitment and (b) the Total Commitment shall
be deemed used from time to time to the extent of the aggregate principal
amount of the Competitive Loans then outstanding, and such deemed use of the
Total Commitment shall be applied to the Banks ratably according to their
respective Commitments (such deemed use of the Total Commitment being a
"Competitive Reduction"), subject, however, to the conditions that (i) at no
time shall (A) the sum of (x) the outstanding aggregate principal amount of all
Committed Loans made by all Banks plus (y) the outstanding aggregate principal
amount of all Competitive Loans made by all Banks exceed (B) the Total
Commitment and (ii) at all times the outstanding aggregate principal amount of
all Committed Loans made by a Bank shall equal the product of (x) the
percentage which its Commitment represents of the Total Commitment times (y)
the outstanding aggregate principal amount of all Committed Loans obligated to
have been made by all Banks.

         Within the foregoing limits, the Company may borrow, repay, prepay,
and reborrow hereunder, on and after the Effective Date and prior to the
Termination Date, subject to the terms, provisions, and limitations set forth
herein.

         Section 2.2         Competitive Bid Procedure.

                 (a)         In order to request Competitive Bids, the Company
         shall hand deliver or telecopy to the Administrative Agent and the
         Auction Administration Agent a duly completed Competitive Bid Request,
         to be received by the Administrative Agent and the Auction
         Administration Agent (i) in the case of Eurodollar Loans, not later
         than 9:00 a.m., Houston, Texas time, four Business Days before the
         Borrowing Date specified for a proposed Competitive Borrowing and (ii)
         in the case of Fixed Rate Loans, not later than 9:00 a.m., Houston,
         Texas time, one Business Day before the Borrowing Date specified for a
         proposed Competitive Borrowing.  No Alternate Base Loan shall be
         requested in, or, except pursuant to Section 2.14, made pursuant to, a
         Competitive Bid Request.  A Competitive Bid Request that does not
         conform substantially to the format of Exhibit A-1 may be rejected at
         the Auction Administration Agent's sole discretion, and the Auction
         Administration Agent





                                      -21-
<PAGE>   27
         shall promptly notify the Company of such rejection by telecopier.
         Each Competitive Bid Request shall in each case refer to this
         Agreement and specify (x) whether the Competitive Loans then being
         requested are to be Eurodollar Loans or Fixed Rate Loans, (y) the
         Borrowing Date of such Competitive Loans (which shall be a Business
         Day) and the aggregate principal amount thereof (which shall not be
         less than $10,000,000 or greater than the unused Total Commitment on
         such Borrowing Date and shall be an integral multiple of $1,000,000),
         and (z) the Interest Period with respect thereto (which may not end
         after the Termination Date).  Promptly after its receipt of a
         Competitive Bid Request that is not rejected as aforesaid, the Auction
         Administration Agent shall invite by telecopier (substantially in the
         form set forth in Exhibit B hereto) the Banks to bid, on the terms and
         conditions of this Agreement, to make Competitive Loans pursuant to
         such Competitive Bid Request.

                 (b)         Each Bank may, in its sole discretion, make one or
         more Competitive Bids to the Company responsive to each Competitive
         Bid Request.  Each Competitive Bid by a Bank must be received by the
         Auction Administration Agent via telecopier, substantially in the form
         of Exhibit C hereto, (i) in the case of Eurodollar Loans, not later
         than 9:00 a.m., Houston, Texas time, three Business Days before the
         Borrowing Date specified for a proposed Competitive Borrowing and (ii)
         in the case of Fixed Rate Loans, not later than 8:30 a.m., Houston,
         Texas time, on the day of a proposed Competitive Borrowing.
         Competitive Bids that do not conform substantially to the format of
         Exhibit C may be rejected by the Auction Administration Agent after
         conferring with, and upon the instruction of, the Company, and the
         Auction Administration Agent shall notify the non-conforming Bank of
         such rejection as soon as practicable.  Each Competitive Bid shall
         refer to this Agreement and (x) specify the principal amount (which
         shall be in a minimum principal amount of $5,000,000 and in an
         integral multiple of $1,000,000 and which may equal the entire
         principal amount of the Competitive Borrowing requested by the
         Company) of the Competitive Loan the Bank is willing to make to the
         Company, (y) specify the Competitive Bid Rate(s) at which the Bank is
         prepared to make the Competitive Loan and (z) confirm the Interest
         Period with respect thereto specified by the Company in its
         Competitive Bid Request.  A Competitive Bid submitted by a Bank
         pursuant to this paragraph (b) shall be irrevocable.





                                      -22-
<PAGE>   28
                 (c)         The Auction Administration Agent shall promptly
         notify the Company by telecopier of all the Competitive Bids made, the
         Competitive Bid Rate and the principal amount of each Competitive Loan
         in respect of which a Competitive Bid was made and the identity of the
         Bank that made each bid.  The Auction Administration Agent shall send
         a copy of all Competitive Bids to the Company for its records as soon
         as practicable after completion of the bidding process set forth in
         this Section 2.2.

                 (d)         The Company may in its sole and absolute
         discretion, subject only to the provisions of this Section 2.2(d),
         accept or reject any or all of the Competitive Bids referred to in
         paragraph (c) above; provided, however, that the aggregate amount of
         the Competitive Bids so accepted by the Company may not exceed the
         principal amount of the Competitive Borrowing requested by the
         Company.  The Company shall notify the Auction Administration Agent by
         telecopier whether and to what extent it has decided to accept or
         reject any or all of the bids referred to in paragraph (c) above, (i)
         in the case of Eurodollar Loans, not later than 11:00 a.m., Houston,
         Texas time, three Business Days before the Borrowing Date specified
         for a proposed Competitive Borrowing and (ii) in the case of Fixed
         Rate Loans, not later than 9:30 a.m., Houston, Texas time, on the day
         specified for a proposed Competitive Borrowing; provided, however,
         that (w) the failure by the Company to give such notice shall be
         deemed to be a rejection of all the bids referred to in paragraph (c)
         above, (x) the Company shall not accept a bid made at a particular
         Competitive Bid Rate if the Company has decided to reject a bid made
         at a lower Competitive Bid Rate, (y) if the Company shall accept bids
         made at a particular Competitive Bid Rate but shall be restricted by
         other conditions hereof from borrowing the full principal amount of
         Competitive Loans in respect of which bids at such Competitive Bid
         Rate have been made or shall not require the full amount offered
         thereby, then the Company shall accept a pro rata portion of each bid
         made at such Competitive Bid Rate based as nearly as possible on the
         respective principal amounts of Competitive Loans for which such bids
         were made and (z) no bid shall be accepted for a Competitive Loan
         unless such Competitive Loan is in a





                                      -23-
<PAGE>   29
         minimum principal amount of $5,000,000 and an integral multiple of
         $1,000,000.  Notwithstanding the foregoing clause (z), if it is
         necessary for the Company to accept a pro rata allocation of the bids
         made in response to a Competitive Bid Request (whether pursuant to the
         events specified in clause (y) above or otherwise) and the available
         principal amount of Competitive Loans to be allocated among the Banks
         is not sufficient to enable Competitive Loans to be allocated to each
         Bank in a minimum principal amount of $5,000,000 and in integral
         multiples of $1,000,000, then the Company shall select the Banks to be
         allocated such Competitive Loans and shall round allocations up or
         down to the next higher or lower multiple of $500,000 as it shall deem
         appropriate.  A notice given by the Company pursuant to this paragraph
         (d) shall be irrevocable.

                 (e)         The Auction Administration Agent shall promptly
         notify each bidding Bank whether or not its Competitive Bid has been
         accepted (and if so, in what amount and at what Competitive Bid Rate)
         by telecopier, and each successful bidder will thereupon become bound,
         subject to the other applicable conditions hereof, to make the
         Competitive Loan in respect of which its bid has been accepted.  After
         completing the notifications referred to in the immediately preceding
         sentence, the Auction Administration Agent shall (i) notify the
         Administrative Agent of each Competitive Bid that has been accepted,
         the amount thereof and the Competitive Bid Rate therefor and (ii)
         notify each Bank of the aggregate principal amount of all Competitive
         Bids accepted.

                 (f)         Upon receipt from the Administrative Agent of the
         LIBO Rate applicable to any Eurodollar Loan to be made by any Bank
         pursuant to a Competitive Bid that has been accepted by the Company
         pursuant to Section 2.2(d), the Auction Administration Agent shall
         notify such Bank of (i) the applicable LIBO Rate and (ii) the sum of
         the applicable LIBO Rate plus the Margin bid by such Bank.

                 (g)         No Competitive Bid Request shall be made within
         five Business Days of the date of any other Competitive Bid Request,
         unless the Company and the Auction Administration Agent shall mutually
         agree otherwise.





                                      -24-
<PAGE>   30
                 (h)         If the Auction Administration Agent shall at any
         time have a Commitment hereunder and shall elect to submit a
         Competitive Bid in its capacity as a Bank, it shall submit such bid
         directly to the Company one quarter of an hour earlier than the latest
         time at which the other Banks are required to submit their bids to the
         Auction Administration Agent pursuant to paragraph (b) above.

                 (i)         All notices required by this Section 2.2 shall be
         made in accordance with Section 8.2.

         Section 2.3         Committed Borrowing Procedure.  In order to effect
a Committed Borrowing, the Company shall hand deliver or telecopy to the
Administrative Agent a duly completed request for Committed Borrowing,
substantially in the form of Exhibit A-2 hereto (a "Notice of Committed
Borrowing"), (i) in the case of Eurodollar Loans, not later than 10:00 a.m.,
Houston, Texas time, three Business Days before the Borrowing Date specified
for a proposed Committed Borrowing, and (ii) in the case of Alternate Base
Loans, not later than 10:00 a.m., Houston, Texas time, on the Business Day
which is the Borrowing Date specified for a proposed Committed Borrowing.  No
Fixed Rate Loan shall be requested or made pursuant to a Notice of Committed
Borrowing.  Such notice shall be irrevocable and shall in each case refer to
this Agreement and specify (x) whether the Loans then being requested are to be
Eurodollar Loans, or Alternate Base Loans, (y) the Borrowing Date of such Loans
(which shall be a Business Day) and the aggregate amount thereof (which shall
not be less than $10,000,000 and shall be an integral multiple of $1,000,000)
and (z) in the case of a Eurodollar Loan, the Interest Period with respect
thereto (which shall not end later than the Termination Date).  If no Interest
Period with respect to any Eurodollar Loan is specified in any such Notice of
Committed Borrowing, then the Company shall be deemed to have selected an
Interest Period of one month's duration.  Promptly, and in any event on the
same day the Administrative Agent receives a Notice of Committed Borrowing
pursuant to this Section 2.3 if such notice is received by 10:00 a.m., Houston,
Texas time on a Business Day and otherwise on the next succeeding Business Day,
the Administrative Agent shall advise the other Banks of such Notice of
Committed Borrowing and of each Bank's portion of the requested Committed
Borrowing by telecopier.  Each Committed Borrowing shall consist of Loans of
the same Type made on the same day and having the same Interest Period.





                                      -25-
<PAGE>   31
         Section 2.4         Refinancings; Conversions.

                 (a)         The Company may refinance all or any part of any
         Loan with a Loan of the same or a different type made pursuant to
         Section 2.2 or Section 2.3, subject to the conditions and limitations
         set forth herein and elsewhere in this Agreement, including, without
         limitation, refinancings of Competitive Loans with Committed Loans and
         Committed Loans with Competitive Loans.  Any Loan or part thereof so
         refinanced shall be deemed to be repaid in accordance with Section
         2.18 with the proceeds of a new Borrowing hereunder and the proceeds
         of the new Loan, to the extent they do not exceed the principal amount
         of the Loan being refinanced, shall not be paid by the Banks to the
         Administrative Agent or by the Administrative Agent to the Company
         pursuant to Section 2.7(c); provided, however, that (i) if the
         principal amount extended by a Bank in a refinancing is greater than
         the principal amount extended by such Bank in the Borrowing being
         refinanced, then such Bank shall pay such difference to the
         Administrative Agent for distribution to the Banks described in (ii)
         below, (ii) if the principal amount extended by a Bank in the
         Borrowing being refinanced is greater than the principal amount being
         extended by such Bank in the refinancing, the Administrative Agent
         shall return the difference to such Bank out of amounts received
         pursuant to (i) above, (iii) to the extent any Bank fails to pay the
         Administrative Agent amounts due from it pursuant to (i) above, any
         Loan or portion thereof being refinanced shall not be deemed repaid in
         accordance with Section 2.18 to the extent of such failure and the
         Company shall pay such amount to the Administrative Agent pursuant to
         Section 2.18 and (iv) to the extent the Company fails to pay to the
         Administrative Agent any amounts due in accordance with Section 2.18
         as a result of the failure of a Bank to pay the Administrative Agent
         any amounts due as described in (iii) above, the portion of any
         refinanced Loan deemed not repaid shall be deemed to be outstanding
         solely to the Bank which has failed to pay the Administrative Agent
         amounts due from it pursuant to (i) above to the full extent of such
         Bank's portion of such refinanced Loan.

                 (b)         Subject to the conditions and limitations set
         forth in this Agreement, the Company shall have the right from time to
         time to convert all or part of one Type of Committed Loan





                                      -26-
<PAGE>   32
         into another Type of Committed Loan or to continue all or a part of
         any Committed Loan that is a Eurodollar Loan from one Interest Period
         to another Interest Period by giving the Administrative Agent written
         notice (by means of a Notice of Committed Borrowing) (i) in the case
         of Eurodollar Loans, not later than 10:00 a.m., Houston, Texas time,
         three Business Days before the date specified for such proposed
         conversion or continuation, and (ii) in the case of Alternate Base
         Loans, not later than 10:00 a.m., Houston, Texas time, on the Business
         Day which is the date specified for such proposed conversion or
         continuation.  Such notice shall specify (A) the proposed date for
         conversion or continuation, (B) the amount of the Committed Loan to be
         converted or continued, (C) in the case of conversions, the Type of
         Committed Loan to be converted into, and (D) in the case of a
         continuation of or conversion into a Eurodollar Loan, the duration of
         the Interest Period applicable thereto; provided that (1) Eurodollar
         Loans may be converted only on the last day of the applicable Interest
         Period, (2) except for conversions to Alternate Base Loans, no
         conversion shall be made while a Default or Event of Default has
         occurred and is continuing and no continuations of any Eurodollar Loan
         from one Interest Period to another Interest Period shall be made
         while a Default or Event of Default has occurred and is continuing,
         unless such conversion or continuation has been approved by Majority
         Committed Banks, and (3) each such conversion or continuation shall be
         in an amount not less than $10,000,000 and shall be an integral
         multiple of $1,000,000.  All notices given under this Section shall be
         irrevocable.  If the Company shall fail to give the Administrative
         Agent the notice as specified above for continuation or conversion of
         a Eurodollar Loan prior to the end of the Interest Period with respect
         thereto, such Eurodollar Loan shall automatically be converted into an
         Alternate Base Loan on the last day of the Interest Period for such
         Eurodollar Loan.

         Section 2.5         Fees.  The Company agrees to pay to each Bank,
through the Administrative Agent, on each Quarterly Payment Date and on the
Termination Date, in immediately available funds, a facility fee (a "Facility
Fee") calculated by multiplying the Facility Fee Percentage by the amount of
the average daily Commitment of such Bank, whether used or unused, during the
preceding three-month period (or shorter period commencing with the Effective
Date and/or ending with the Termination Date).  All





                                      -27-
<PAGE>   33
Facility Fees shall be computed by the Administrative Agent on the basis of the
actual number of days elapsed in a year of 360 days, and shall be conclusive
and binding for all purposes, absent manifest error.  The Facility Fee due to
each Bank shall commence to accrue on the Effective Date and shall cease to
accrue on the earlier of the Termination Date and the termination of the
Commitment of such Bank as provided herein.  Notwithstanding the foregoing, in
no event shall any Bank be permitted to receive any compensation hereunder
constituting interest in excess of the Highest Lawful Rate.

         Section 2.6         Termination and Reduction of Commitments.

                 (a)         Subject to Section 2.12(b), the Company may
         permanently terminate, or from time to time in part permanently
         reduce, the Total Commitment, in each case upon at least three
         Business Days' prior written notice to the Administrative Agent (who
         shall promptly forward a copy thereof to each Bank and the Auction
         Administration Agent).  Such notice shall specify the date and the
         amount of the termination or reduction of the Total Commitment.  Each
         such partial reduction of the Total Commitment shall be in a minimum
         aggregate principal amount of $10,000,000 and in an integral multiple
         of $1,000,000.

                 (b)         On the Termination Date the Total Commitment shall
         be zero.

                 (c)         Each reduction in the Total Commitment pursuant to
         this Section 2.6 shall be made ratably among the Banks in accordance
         with their respective Commitments. Simultaneously with any termination
         of Commitments pursuant to this Section, the Company shall pay to the
         Administrative Agent for the accounts of the Banks the Facility Fees
         on the amount of the Total Commitment so terminated, accrued through
         the date of such termination.

         Section 2.7         Loans.

                 (a)         Each Borrowing made by the Company on any date
         shall be (i) in the case of Competitive Loans, in an integral multiple
         of $1,000,000 and in a minimum aggregate principal amount of
         $5,000,000 and (ii) in the case of Committed Loans, in an integral
         multiple of $1,000,000 and in a minimum





                                      -28-
<PAGE>   34
         aggregate principal amount of $10,000,000.  Competitive Loans shall be
         made by the Banks in accordance with Section 2.2(d), and Committed
         Loans shall be made by the Banks ratably in accordance with their
         respective Commitments on the Borrowing Date of the Committed
         Borrowing; provided, however, that the failure of any Bank to make any
         Loan shall not in itself relieve any other Bank of its obligation to
         lend hereunder.

                 (b)         Each Competitive Loan shall be a Eurodollar Loan
         or a Fixed Rate Loan, and each Committed Loan shall be a Eurodollar
         Loan or an Alternate Base Loan, as the Company may request subject to
         and in accordance with Section 2.2, Section 2.3 or Section 2.4(b), as
         applicable.  Each Bank may at its option make any Eurodollar Loan by
         causing a foreign branch or Affiliate of such Bank to make such Loan;
         provided, however, that any exercise of such option shall not affect
         the obligation of the Company to repay such Loan in accordance with
         the terms of this Agreement.  Loans of more than one interest rate
         option may be outstanding at the same time; provided, however, that
         the Company shall not be entitled to request any Loan which, if made,
         would result in an aggregate of more than ten separate Interest
         Periods being outstanding hereunder at any one time.  For purposes of
         the foregoing, Loans having different Interest Periods, regardless of
         whether they commence on the same date, shall be considered separate
         Loans.

                 (c)         Subject to Section 2.4, each Bank shall make its
         portion of each Competitive Borrowing and each Committed Borrowing on
         the proposed Borrowing Date thereof by paying the amount required to
         the Administrative Agent at the Principal Office in immediately
         available funds not later than 12:00 noon, Houston, Texas time, and
         the Administrative Agent shall by 2:00 p.m., Houston, Texas time,
         credit the amounts so received to the general deposit account of the
         Company with the Administrative Agent or, if Loans are not made on
         such date because any condition precedent to a Borrowing herein
         specified shall not have been met, return the amounts so received to
         the respective Banks as soon as practicable; provided, however, if and
         to the extent the Administrative Agent fails to return any such
         amounts to a Bank on the Borrowing Date for such Borrowing, the
         Administrative Agent shall pay interest on such unreturned amounts,
         for each day from such Borrowing Date to the date such amounts are
         returned to such Bank, at the Federal Funds Effective Rate.





                                      -29-
<PAGE>   35
                 (d)         The outstanding principal amount of each
         Competitive Loan shall be due and payable on the last day of the
         Interest Period applicable to such Competitive Loan, and the
         outstanding principal balance of each Committed Loan shall be due and
         payable on the Termination Date.

         Section 2.8         Loan Accounts.

                 (a)         The Loans made by each Bank shall be evidenced by
         one or more loan accounts or records maintained by such Bank in the
         ordinary course of business.  Absent manifest error, the loan accounts
         or records maintained by the Administrative Agent and each Bank shall
         be prima facie evidence of the amount of the Loans made by the Banks
         to the Company and the interest and payments thereon.  Any failure so
         to record or any error in doing so shall not, however, limit or
         otherwise affect the obligation of the Company hereunder to pay any
         amount owing with respect to the Loans.

                 (b)         Upon the request of any Bank made through the
         Administrative Agent, the Loans made by such Bank may be evidenced by
         one or more Notes, instead of or in addition to loan accounts, and
         upon any such request the Company shall execute and deliver such Notes
         to such Bank.  Each such Bank shall, and is hereby authorized by the
         Company to, endorse on the schedule attached to the relevant Note held
         by such Bank (or on a continuation of such schedule attached to each
         such Note and made a part thereof) or in its records relating to such
         Note an appropriate notation evidencing the date and amount of each
         Competitive Loan or Committed Loan, as applicable, of such Bank, each
         payment or prepayment of principal of any Competitive Loan or
         Committed Loan, as applicable, and the other information provided for
         on such schedule.  The failure of any Bank to make such a notation or
         any error therein shall not in any manner affect the obligation of the
         Company to repay the Competitive Loans or Committed Loans, as
         applicable, made by such Bank in accordance with the terms of the
         relevant Note.





                                      -30-
<PAGE>   36

         Section 2.9         Interest on Loans.

                 (a)         Subject to the provisions of Section 2.10, each
         Eurodollar Loan shall bear interest at a rate per annum (computed on
         the basis of the actual number of days elapsed over a year of 360
         days) equal to the lesser of (i) the Highest Lawful Rate and (ii) the
         LIBO Rate for the Interest Period in effect for such Loan (A) plus or
         minus, as the case may be, in the case of each Competitive Loan, the
         Margin specified by a Bank with respect to such Loan in its
         Competitive Bid submitted pursuant to Section 2.2(b) or (B) plus, in
         the case of each Committed Loan, the Applicable Margin.  Interest on
         each Eurodollar Loan shall be payable on each Interest Payment Date
         applicable thereto.  The applicable LIBO Rate for each Interest Period
         shall be determined by the Administrative Agent, and such
         determination shall be conclusive absent manifest error.

                 (b)         Subject to the provisions of Section 2.10, each
         Alternate Base Loan shall bear interest at the rate per annum equal to
         the lesser of (i) the Highest Lawful Rate and (ii) the Alternate Base
         Rate (if the Alternate Base Rate is based on the Prime Rate, computed
         on the basis of the actual number of days elapsed over a year of 365
         or 366 days, as the case may be; if the Alternate Base Rate is based
         on the Federal Funds Effective Rate, computed on the basis of the
         actual number of days elapsed over a year of 360 days).  Interest on
         each Alternate Base Loan shall be payable on each Interest Payment
         Date applicable thereto.  The applicable Alternate Base Rate shall be
         determined by the Administrative Agent, and such determination shall
         be conclusive absent manifest error.

                 (c)         Subject to the provisions of Section 2.10, each
         Fixed Rate Loan shall bear interest at a rate per annum (computed on
         the basis of the actual number of days elapsed over a year of 360
         days) equal to the fixed rate of interest offered by the Bank making
         such Loan and accepted by the Company pursuant to Section 2.2.
         Interest on each Fixed Rate Loan shall be payable on each Interest
         Payment Date applicable thereto.

                 (d)         The Company shall pay to the Administrative Agent
         for the account of each Bank that has made a Eurodollar Loan to the
         Company, so long as such Bank shall be required under





                                      -31-
<PAGE>   37
         regulations of the Board to maintain reserves with respect to
         liabilities or assets consisting of or including Eurocurrency
         Liabilities, additional interest on the unpaid principal amount of
         each such Eurodollar Loan of such Bank, from the date of such Loan
         until such principal amount is paid in full, at an interest rate per
         annum for such number of days during the Interest Period for such Loan
         as shall be pertinent equal to the remainder obtained by subtracting
         (i) the LIBO Rate for such Interest Period from (ii) the rate obtained
         by dividing such LIBO Rate referred to in clause (i) above by that
         percentage equal to 100% minus the Reserve Percentage of such Bank for
         such Interest Period, payable on the next Interest Payment Date
         applicable to such Loan; provided, however, in no event shall any Bank
         be permitted to receive interest hereunder in excess of the Highest
         Lawful Rate.  Such additional interest shall be determined by such
         Bank as, if and to the extent incurred, and shall be payable as
         aforesaid upon notification thereof by such Bank to the Company
         through the Administrative Agent.  Each determination by a Bank of
         additional interest under this Section 2.9(d) shall be conclusive and
         binding for all purposes in the absence of manifest error.

         Section 2.10        Interest on Overdue Amounts.  If the Company shall
default in the payment of the principal of or interest on any Loan or any other
amount becoming due hereunder, the Company shall on demand from time to time
pay interest, to the extent permitted by Law, on such defaulted amount up to
(but not including) the date of actual payment (after as well as before
judgment) at a rate per annum equal to the lesser of (i) the Highest Lawful
Rate and (ii) the Agreed Maximum Rate (if the Alternate Base Rate is based on
the Prime Rate, computed on the basis of the actual number of days elapsed over
a year of 365 or 366 days, as the case may be; if the Alternate Base Rate is
based on the Federal Funds Effective Rate, computed on the basis of the actual
number of days elapsed over a year of 360 days).

         Section 2.11        Alternate Rate of Interest.  In the event, and on
each occasion, that on the day two Business Days prior to the commencement of
any Interest Period for a Eurodollar Loan that is a Committed Loan, the
Administrative Agent shall have determined that dollar deposits in the amount
of the requested principal amount of such Eurodollar Loan are not generally
available in the Eurodollar Interbank Market, or that dollar deposits are not





                                      -32-
<PAGE>   38
generally available in the Eurodollar Interbank Market for the requested
Interest Period, or that the rate at which such dollar deposits are being
offered will not adequately and fairly reflect the cost to any Bank of making
or maintaining such Eurodollar Loan during such Interest Period, or that
reasonable means do not exist for ascertaining the LIBO Rate, the
Administrative Agent shall, as soon as practicable thereafter, give telecopy
notice of such determination to the Company, the Auction Administration Agent,
and the Banks.  In the event of any such determination, any request by the
Company for a Eurodollar Loan that is a Committed Loan shall, until the
circumstances giving rise to such notice no longer exist, be deemed to be a
request for an Alternate Base Loan.  Each determination by the Administrative
Agent hereunder shall be conclusive absent manifest error.

         Section 2.12        Prepayment of Loans.

                 (a)         Prior to the Termination Date, the Company shall
         have the right at any time to prepay any Committed Borrowing, in whole
         or in part, subject to the requirements of Section 2.15 or Section
         2.16 but otherwise without premium or penalty, upon at least five
         Business Days prior written notice to the Administrative Agent;
         provided, however, that each such partial prepayment shall be in an
         integral multiple of $1,000,000 and in a minimum aggregate principal
         amount of $5,000,000.  Each notice of prepayment shall specify the
         prepayment date and the aggregate principal amount of each Borrowing
         to be prepaid, shall be irrevocable and shall commit the Company to
         prepay such Borrowing by the amount stated therein.  The Company shall
         not have the right to prepay any Competitive Borrowing.

                 (b)         On the date of any termination or reduction of the
         Total Commitment pursuant to Section 2.6(a), the Company shall pay or
         prepay so much of the Loans as shall be necessary in order that the
         aggregate principal amount of the Loans outstanding will not exceed
         the Total Commitment following such termination or reduction.  Subject
         to the foregoing, any such payment or prepayment shall be applied to
         such Borrowing or Borrowings as the Company shall select.  All
         prepayments under this paragraph shall be subject to Section 2.15 and
         Section 2.16.





                                      -33-
<PAGE>   39
                 (c)         All prepayments under this Section 2.12 shall be
         accompanied by accrued interest on the principal amount being prepaid
         to the date of prepayment.

         Section 2.13        Reserve Requirements; Change in Circumstances.

                 (a)         Notwithstanding any other provision herein, if
         after the date of this Agreement any Regulatory Change (i) shall
         change the basis of taxation of payments to any Bank of the principal
         of or interest on any Eurodollar Loan or Fixed Rate Loan made by such
         Bank or any other fees or amounts payable hereunder (other than (x)
         Taxes imposed on or measured by the capital, receipts or franchises of
         such Bank or the overall gross or net income of such Bank by the
         jurisdiction in which such Bank has its principal office or by any
         political subdivision or taxing authority therein (or any Tax which is
         enacted or adopted by such jurisdiction, political subdivision, or
         taxing authority as a direct substitute for any such Taxes) or (y) any
         Tax, assessment, or other governmental charge that would not have been
         imposed but for the failure of any Bank to comply with any
         certification, information, documentation, or other reporting
         requirement), (ii) shall impose, modify, or deem applicable any
         reserve, special deposit, or similar requirement with respect to any
         Eurodollar Loan against assets of, deposits with or for the account
         of, or credit extended by, such Bank under this Agreement (without
         duplication of any amounts paid pursuant to Section 2.9(d)), or (iii)
         with respect to any Eurodollar Loan, shall impose on such Bank or the
         Eurodollar Interbank Market any other condition affecting this
         Agreement or any Eurodollar Loan made by such Bank, and the result of
         any of the foregoing shall be to materially increase the actual cost
         to such Bank of maintaining its Commitment or of making or maintaining
         any Eurodollar Loan or Fixed Rate Loan or to materially reduce the
         amount of any sum received or receivable by such Bank hereunder
         (whether of principal, interest, or otherwise) in respect thereof,
         then the Company shall pay to the Administrative Agent for the account
         of such Bank, within ten days following delivery to the Company of the
         certificate specified in paragraph (c) below by such Bank, such
         additional amount or amounts as will reimburse such Bank for such
         increase or reduction to such Bank to the extent reasonably allocable
         to this Agreement.  Notwithstanding the foregoing, in no event shall
         any Bank be permitted to receive any payment hereunder constituting
         interest in excess of the Highest Lawful Rate.





                                      -34-
<PAGE>   40
                 (b)         If any Bank shall have determined in good faith
         that any Regulatory Change regarding capital adequacy or compliance by
         any Bank (or its parent or any lending office of such Bank) with any
         request or directive regarding capital adequacy (whether or not having
         the force of Law) of any Tribunal, monetary authority, central bank,
         or comparable agency, has or would have the effect of reducing the
         rate of return on such Bank's (or its parent's) capital as a
         consequence of its obligations hereunder to a level below that which
         such Bank (or its parent) could have achieved but for such Regulatory
         Change, or compliance (taking into consideration such Bank's policies
         with respect to capital adequacy) by an amount deemed by such Bank to
         be material, then from time to time, the Company shall pay to the
         Administrative Agent for the account of such Bank, within ten days
         following delivery to the Company of the certificate specified in
         paragraph (c) below by such Bank, such additional amount or amounts as
         will reimburse such Bank (or its parent) for such reduction.
         Notwithstanding the foregoing, in no event shall any Bank be permitted
         to receive any payment hereunder constituting interest in excess of
         the Highest Lawful Rate.

                 (c)         Each Bank shall notify the Company of any event
         occurring after the date hereof entitling such Bank to compensation
         under paragraph (a) or (b) of this Section 2.13 (together with a good
         faith estimate of the amounts it would be entitled to claim in respect
         of such event) as promptly as practicable, but in any event on or
         before the date which is 60 days after the related Regulatory Change
         or other event; provided that (i) if such Bank fails to give such
         notice by such date, such Bank shall, with respect to compensation
         payable pursuant to paragraph (a) or (b) of this Section 2.13 in
         respect of any costs resulting from such Regulatory Change or other
         event, only be entitled to payment under paragraph (a) or (b) of this
         Section 2.13 for costs incurred from and after the date of such notice
         and (ii) such Bank will take such reasonable actions, if any
         (including the designation of a different Applicable Lending Office
         for the Loans of such Bank affected by such event) to avoid the need
         for, or reduce the amount of, such compensation so long as such
         actions will not, in the reasonable opinion of such Bank,





                                      -35-
<PAGE>   41
         be materially disadvantageous to such Bank.  A certificate of a Bank
         setting forth in reasonable detail (i) the Regulatory Change or other
         event giving rise to any costs, (ii) such amount or amounts as shall
         be necessary to reimburse such Bank (or participating banks or other
         entities pursuant to Section 8.11) as specified in paragraph (a) or
         (b) of this Section 2.13, as the case may be, and (iii) the
         calculation of such amount or amounts, shall be delivered to the
         Company (with a copy to the Administrative Agent) promptly after such
         Bank determines it is entitled to payment under this Section 2.13, and
         shall be conclusive and binding absent manifest error.  In preparing
         such certificate, such Bank may employ such assumptions and
         allocations of costs and expenses as it shall in good faith deem
         reasonable and may use any reasonable averaging and attribution
         method.

                 (d)         In the event any Bank shall seek payment pursuant
         to this Section 2.13 or the events contemplated under Section 2.11 or
         Section 2.14 shall have occurred with respect to any Bank, the Company
         may, provided no Event of Default has occurred and is continuing, give
         notice to such Bank (with copies to the Agents) that it wishes to seek
         one or more Eligible Assignees (which may be one or more of the Banks,
         but which may not be a Person who would be entitled at such time to
         claim payment pursuant to this Section 2.13 or with respect to which
         any of the events contemplated under Section 2.11 or Section 2.14
         would exist at such time if such Person were a Bank under this
         Agreement) to assume the Commitment of such Bank and to purchase its
         outstanding Loans and Notes (if any).  Each Bank requesting payment
         pursuant to this Section 2.13, or with respect to which any of the
         events contemplated under Section 2.11 or Section 2.14 have occurred,
         agrees to sell its Commitment, Loans, Notes (if any), and interest in
         this Agreement and the other Loan Papers pursuant to Section 8.11(c)
         to any such Eligible Assignee approved by the Company and the
         Administrative Agent for an amount equal to the sum of the outstanding
         unpaid principal of and accrued interest on such Loans and Notes (if
         any) plus all other fees and amounts (including, without limitation,
         any payment claimed by such Bank under this Section 2.13 and as to
         which such Bank has delivered the certificate required by Section
         2.13(c) on or before the date such Commitment, Loans, and Notes (if 
         any) are purchased) due such Bank hereunder calculated, in each case, 
         to the date such Commitment, Loans, 





                                      -36-
<PAGE>   42
         Notes (if any) and interest are purchased, whereupon such Bank shall
         have no further Commitment or other obligation to the Company hereunder
         or under any other Loan Paper.

                 (e)         Notwithstanding anything herein to the contrary,
         no Bank or participant shall be entitled to any payment under this
         Section 2.13 with respect to any Competitive Loan.

                 (f)         Without prejudice to the survival of any other
         obligations of the Company hereunder, the obligations of the Company
         under this Section 2.13 shall survive for one year after the
         termination of this Agreement and/or the payment or assignment of any
         of the Loans or Notes.

         Section 2.14        Change in Legality.

                 (a)         Notwithstanding anything to the contrary herein
         contained, if any Regulatory Change shall make it unlawful for any
         Bank to make or maintain any Eurodollar Loan or to give effect to its
         obligations in respect of Eurodollar Loans as contemplated hereby,
         then, by prompt written notice to the Company and to the
         Administrative Agent and the Auction Administration Agent, such Bank
         may:

                             (i)          declare that Eurodollar Loans will
                 not thereafter be made by such Bank hereunder, whereupon the
                 Company shall be prohibited from requesting Eurodollar Loans
                 from such Bank hereunder unless such declaration is
                 subsequently withdrawn; and

                             (ii)         if such unlawfulness shall be
                 effective prior to the end of any Interest Period of an
                 outstanding Eurodollar Loan, require that all outstanding
                 Eurodollar Loans with such Interest Periods made by it be
                 converted to Alternate Base Loans, in which event (A) all such
                 Eurodollar Loans shall be automatically converted to Alternate
                 Base Loans as of the effective date of such notice as provided
                 in paragraph (b) below and (B) all payments and prepayments of
                 principal which would otherwise have been applied to repay the
                 converted Eurodollar Loans shall instead be applied to repay
                 the Alternate Base Loans resulting from the conversion of such
                 Eurodollar Loans.





                                      -37-
<PAGE>   43
                 (b)         For purposes of this Section 2.14, a notice to the
         Company (with a copy to the Administrative Agent and the Auction
         Administration Agent) by any Bank pursuant to paragraph (a) above
         shall be effective on the date of receipt thereof by the Company.  Any
         Bank having furnished such a notice agrees to withdraw the same
         promptly following any Regulatory Change that makes it lawful for such
         Bank to make and maintain Eurodollar Loans.

                 (c)         If, with respect to any Bank, a condition arises
         or an event occurs which would, or would upon the giving of notice,
         result in the payment of amounts pursuant to Section 2.13 or permit
         such Bank, pursuant to this Section 2.14, to suspend its obligation to
         make Eurodollar Loans, such Bank, promptly upon becoming aware of the
         same, shall notify the Company thereof and shall take such steps as
         may reasonably be available to it (including, without limitation,
         changing its Applicable Lending Office) to mitigate the effects of
         such condition or event, provided that such Bank shall be under no
         obligation to take any step that, in its good faith opinion, would (a)
         result in its incurring any additional costs in performing its
         obligations hereunder and under any outstanding Loan (unless the
         Company has notified such Bank of the Company's agreement to reimburse
         it for the same) or (b) be otherwise adverse to such Bank in a
         material respect.

         Section 2.15        INDEMNITY.  THE COMPANY SHALL INDEMNIFY EACH BANK
AGAINST ANY LOSS OR REASONABLE EXPENSE WHICH SUCH BANK MAY SUSTAIN OR INCUR AS
A CONSEQUENCE OF (A) ANY FAILURE BY THE COMPANY TO FULFILL ON THE DATE OF ANY
BORROWING HEREUNDER THE APPLICABLE CONDITIONS SET FORTH IN ARTICLE III, (B) ANY
FAILURE BY THE COMPANY TO BORROW HEREUNDER AFTER A NOTICE OF COMMITTED
BORROWING PURSUANT TO ARTICLE II HAS BEEN GIVEN OR AFTER COMPETITIVE BIDS HAVE
BEEN ACCEPTED, (C) ANY PAYMENT, PREPAYMENT, OR CONVERSION OF A EURODOLLAR LOAN
OR FIXED RATE LOAN REQUIRED BY ANY OTHER PROVISION OF THIS AGREEMENT OR
OTHERWISE MADE ON A DATE OTHER THAN THE LAST DAY OF THE APPLICABLE INTEREST
PERIOD FOR ANY REASON, INCLUDING WITHOUT LIMITATION THE ACCELERATION OF
OUTSTANDING LOANS AS A RESULT OF ANY EVENT OF DEFAULT, (D) ANY FAILURE BY THE
COMPANY FOR ANY REASON (INCLUDING WITHOUT LIMITATION THE EXISTENCE OF A DEFAULT
OR AN EVENT OF DEFAULT) TO PAY, PREPAY OR CONVERT A EURODOLLAR LOAN ON THE DATE
FOR SUCH PAYMENT, PREPAYMENT OR CONVERSION, SPECIFIED IN THE RELEVANT NOTICE OF
PAYMENT, PREPAYMENT OR CONVERSION UNDER





                                      -38-
<PAGE>   44
THIS AGREEMENT.  THE INDEMNITY OF THE COMPANY PURSUANT TO THE IMMEDIATELY
PRECEDING SENTENCE SHALL INCLUDE, BUT NOT BE LIMITED TO, ANY LOSS OR REASONABLE
EXPENSE SUSTAINED OR INCURRED OR TO BE SUSTAINED OR INCURRED IN LIQUIDATING OR
EMPLOYING DEPOSITS FROM THIRD PARTIES ACQUIRED TO EFFECT OR MAINTAIN SUCH LOAN
OR ANY PART THEREOF AS A EURODOLLAR LOAN OR FIXED RATE LOAN.  SUCH LOSS OR
REASONABLE EXPENSE SHALL INCLUDE, WITHOUT LIMITATION, AN AMOUNT EQUAL TO THE
EXCESS, IF ANY, AS REASONABLY DETERMINED BY EACH BANK OF (I) ITS COST OF
OBTAINING THE FUNDS FOR THE LOAN BEING PAID, PREPAID, OR CONVERTED OR NOT
BORROWED, PAID, PREPAID OR CONVERTED (BASED ON THE LIBO RATE OR, IN THE CASE OF
A FIXED RATE LOAN, THE FIXED RATE OF INTEREST APPLICABLE THERETO) FOR THE
PERIOD FROM THE DATE OF SUCH PAYMENT, PREPAYMENT, OR CONVERSION OR FAILURE TO
BORROW, PAY, PREPAY OR CONVERT TO THE LAST DAY OF THE INTEREST PERIOD FOR SUCH
LOAN (OR, IN THE CASE OF A FAILURE TO BORROW, PAY, PREPAY OR CONVERT, THE
INTEREST PERIOD FOR THE LOAN WHICH WOULD HAVE COMMENCED ON THE DATE OF SUCH
FAILURE TO BORROW, PAY, PREPAY OR CONVERT) OVER (II) THE AMOUNT OF INTEREST (AS
REASONABLY DETERMINED BY SUCH BANK) THAT WOULD BE REALIZED BY SUCH BANK IN
REEMPLOYING THE FUNDS SO PAID, PREPAID, OR CONVERTED OR NOT BORROWED, PAID,
PREPAID OR CONVERTED FOR SUCH PERIOD OR INTEREST PERIOD, AS THE CASE MAY BE.  A
CERTIFICATE OF EACH BANK SETTING FORTH ANY AMOUNT OR AMOUNTS AND, IN REASONABLE
DETAIL, THE COMPUTATIONS THEREOF, WHICH SUCH BANK IS ENTITLED TO RECEIVE
PURSUANT TO THIS SECTION 2.15 SHALL BE DELIVERED TO THE COMPANY (WITH A COPY TO
THE ADMINISTRATIVE AGENT) AND SHALL BE CONCLUSIVE, IF MADE IN GOOD FAITH,
ABSENT MANIFEST ERROR.  THE COMPANY SHALL PAY TO THE ADMINISTRATIVE AGENT FOR
THE ACCOUNT OF EACH BANK THE AMOUNT SHOWN AS DUE ON ANY CERTIFICATE WITHIN 30
DAYS AFTER ITS RECEIPT OF THE SAME.  NOTWITHSTANDING THE FOREGOING, IN NO EVENT
SHALL ANY BANK BE PERMITTED TO RECEIVE ANY COMPENSATION HEREUNDER CONSTITUTING
INTEREST IN EXCESS OF THE HIGHEST LAWFUL RATE.  WITHOUT PREJUDICE TO THE
SURVIVAL OF ANY OTHER OBLIGATIONS OF THE COMPANY HEREUNDER, THE OBLIGATIONS OF
THE COMPANY UNDER THIS SECTION 2.15 SHALL SURVIVE FOR ONE YEAR AFTER THE
TERMINATION OF THIS AGREEMENT AND/OR THE PAYMENT OR ASSIGNMENT OF ANY OF THE
LOANS OR NOTES.

         Section 2.16        Pro Rata Treatment.  Except as permitted under
Section 2.9(d), Section 2.13(c) and Section 2.15 with respect to interest, (a)
each payment or prepayment of principal and each payment of interest with
respect to a Competitive Borrowing (at a particular Competitive Bid Rate) or a
Committed Borrowing shall be made pro rata among the Banks in accordance with
the respective





                                      -39-
<PAGE>   45
principal amounts of the Loans extended by each Bank, if any, with respect to
such Competitive Borrowing or Committed Borrowing, and (b) conversions of
Committed Loans to Committed Loans of another Type, continuations of Committed
Loans that are Eurodollar Loans from one Interest Period to another Interest
Period, refinancings of Competitive Loans with Committed Loans, and Committed
Loans which are not refinancings of other Loans shall be made pro rata among
the Banks in accordance with their respective Commitments.

         Section 2.17        Sharing of Setoffs.  Each Bank agrees that if it
shall through the exercise of a right of banker's lien, setoff, or counterclaim
against the Company (pursuant to Section 8.6 or otherwise), including, but not
limited to, a secured claim under Section 506 of Title 11 of the United States
Code or other security or interest arising from, or in lieu of, such secured
claim, received by such Bank under any applicable Debtor Relief Law or
otherwise, obtain payment (voluntary or involuntary) in respect of the
Committed Loans held by it (other than pursuant to Section 2.9(d), Section
2.13, or Section 2.15) as a result of which the unpaid principal portion of the
Committed Loans held by it shall be proportionately less than the unpaid
principal portion of the Committed Loans held by any other Bank, it shall be
deemed to have simultaneously purchased from such other Bank a participation in
the Committed Loans held by such other Bank, so that the aggregate unpaid
principal amount of the Committed Loans and participations in Committed Loans
pursuant to this Section 2.17 held by each Bank shall be in the same proportion
to the aggregate unpaid principal amount of all Committed Loans then
outstanding as the principal amount of the Committed Loans held by it prior to
such exercise of banker's lien, setoff, or counterclaim was to the principal
amount of all Committed Loans outstanding prior to such exercise of banker's
lien, setoff, or counterclaim; provided, however, that if any such purchase or
purchases or adjustments shall be made pursuant to this Section 2.17 and the
payment giving rise thereto shall thereafter be recovered, such purchase or
purchases or adjustments shall be rescinded to the extent of such recovery and
the purchase price or prices or adjustment restored without interest.  The
Company expressly consents to the foregoing arrangements and agrees that any
Bank holding a participation in a Committed Loan deemed to have been so
purchased may exercise any and all rights of banker's lien, setoff, or
counterclaim with respect to any and all moneys owing by the Company to such
Bank as fully as if such Bank had made a Committed Loan directly to the Company
in the amount of such participation.





                                      -40-
<PAGE>   46
         Section 2.18        Payments.

                 (a)         The Company shall make each payment hereunder and
         under any instrument delivered hereunder not later than 11:00 a.m.
         (Houston, Texas time) on the day when due in dollars to the
         Administrative Agent at its Principal Office for the account of the
         Banks, in federal or other immediately available funds.  The
         Administrative Agent will promptly thereafter cause to be distributed
         like funds relating to the payment of principal of or interest on
         Committed Loans (other than pursuant to Section 2.9(d), Section 2.13,
         and Section 2.15) or Facility Fees ratably to the Banks and like funds
         relating to the payment of any other amount (including, without
         limitation, payments of principal or interest on Competitive Loans
         which are not made ratably to the Banks) payable to any Bank to such
         Bank for the account of its Applicable Lending Office, in each case to
         be applied in accordance with the terms of this Agreement.

                 (b)         Whenever any payment hereunder or under any Note
         shall be stated to be due on a day other than a Business Day, such
         payment shall be made on the next succeeding Business Day, and such
         extension of time shall in all such cases be included in the
         computation of payment of interest or Facility Fee, as the case may
         be; provided, however, if such extension would cause payment of
         interest on or principal of a Eurodollar Loan to be made in the next
         following calendar month, such payment shall be made on the next
         preceding Business Day.

                 (c)         Unless the Administrative Agent shall have
         received notice from the Company prior to the date on which any
         payment is due to the Banks hereunder that the Company will not make
         such payment in full, the Administrative Agent may assume that the
         Company has made or will make such payment in full to the
         Administrative Agent on such date and the Administrative Agent may, in
         reliance upon such assumption, cause to be distributed to each Bank on
         such due date an amount equal to the amount then due such Bank.  If
         and to the extent the Company shall not have so made such payment in
         full to the Administrative Agent, each Bank shall repay to the
         Administrative Agent forthwith on demand such amount distributed to
         such Bank together with interest thereon, for each day from the date
         such amount is distributed to such Bank until the date such Bank
         repays such amount to the Administrative Agent, at the Federal Funds
         Effective Rate.





                                      -41-
<PAGE>   47
                 (d)         Except as expressly provided in Section 2.19, all
         payments (whether of principal, interest, fees, reimbursements, or
         otherwise) by the Company under this Agreement shall be made without
         setoff or counterclaim and shall be made free and clear of and without
         deduction for any present or future Tax, levy, impost, or any other
         charge, if any, of any nature whatsoever now or hereafter imposed by
         any Tribunal.  Except as otherwise provided in Section 2.19, if the
         making of such payments by the Company is prohibited by Law unless
         such a Tax, levy, impost, or other charge is deducted or withheld
         therefrom, the Company shall pay to the Administrative Agent, on the
         date of each such payment, such additional amounts (without
         duplication of any other amounts required to be paid by the Company
         pursuant to Section 2.13) as may be necessary in order that the net
         amounts received by the Banks after such deduction or withholding
         shall equal the amounts which would have been received if such
         deduction or withholding were not required.  The Company shall confirm
         that all applicable Taxes, if any, imposed on this Agreement or
         transactions hereunder shall have been properly and legally paid by it
         to the appropriate taxing authorities by sending official Tax receipts
         or notarized copies of such receipts to the Administrative Agent
         within 30 days after payment of any applicable Tax.

         Section 2.19        Tax Forms.  With respect to each Bank which is
organized under the Laws of a jurisdiction outside the United States, within 30
days after the Execution Date, and from time to time thereafter if requested by
the Company or the Administrative Agent, or as otherwise required by law, each
such Bank shall provide the Administrative Agent and the Company with the forms
prescribed by the Internal Revenue Service of the United States certifying as
to such Bank's status for purposes of determining exemption from United States
withholding Taxes with respect to all payments to be made to such Bank
hereunder or other documents satisfactory to the Company and the Administrative
Agent indicating that all payments to be made to such Bank hereunder are
subject to such Tax at a rate reduced by an applicable Tax treaty.  Unless the
Company and the Administrative Agent have received such forms or such documents
indicating that payments hereunder are not subject to United States withholding
Tax, the Company or the Administrative





                                      -42-
<PAGE>   48
Agent (after notice from the Administrative Agent to such Bank of such
non-receipt) shall withhold Taxes from such payments at the applicable
statutory rate (or any reduced applicable Tax treaty rate) in the case of
payments to or for any Bank organized under the Laws of a jurisdiction outside
the United States.

         Section 2.20        Calculation of LIBO Rates.  The provisions of this
Agreement relating to calculation of the LIBO Rate are included only for the
purpose of determining the rate of interest or other amounts to be paid
hereunder that are based upon such rate, it being understood that each Bank
shall be entitled to fund and maintain its funding of all or any part of a
Eurodollar Loan as it sees fit.  All such determinations hereunder, however,
shall be made as if each Bank had actually funded and maintained funding of
each Eurodollar Loan through the purchase in the Eurodollar InterBank Market of
one or more eurodollar deposits in an amount equal to the principal amount of
such Loan and having a maturity corresponding to the Interest Period for such
Loan.

         Section 2.21        Booking Loans.  Subject to Section 2.19, any Bank
may make, carry, or, transfer Loans at, to, or for the account of any of its
branch offices or the office of any Affiliate.

         Section 2.22        Quotation of Rates.  It is hereby acknowledged
that the Company may call the Administrative Agent on or before the date on
which notice of a Borrowing is to be delivered by the Company in order to
receive an indication of the rate or rates then in effect, but that such
projection shall not be binding upon the Administrative Agent or any Bank nor
affect the rate of interest which thereafter is actually in effect when the
election is made.


                                   ARTICLE II

                             CONDITIONS OF LENDING

         Section 3.1         Conditions Precedent to Initial Borrowing.  The
obligation of each Bank to make its initial Loan is subject to the condition
precedent that the Administrative Agent shall have received on or before the
initial Borrowing Date the following, each dated (unless otherwise indicated)
such day and in sufficient copies for each Bank:





                                      -43-
<PAGE>   49
                 (a)         Officer's Certificates dated the Execution Date
         certifying, inter alia, (i) true and correct copies of resolutions
         adopted by the Board of Directors or Executive Committee, as
         appropriate, of the Company authorizing the Company to borrow and
         effect other transactions hereunder, (ii) a true and correct copy of
         the Company's bylaws in effect on the date hereof, (iii) the
         incumbency and specimen signatures of the Persons executing any
         documents on behalf of the Company, (iv) the truth of the
         representations and warranties made by the Company in this Agreement
         (or, if any such representation or warranty is expressly stated to
         have been made as of a specific date, as of such specific date), and
         (v) the absence of the occurrence and continuance of any Default or
         Event of Default.

                 (b)         A copy of the Company's charter and all amendments
         thereto, accompanied by certificates that such copy is correct and
         complete, one certificate dated within twenty days prior to the
         Execution Date and issued by the Secretary of State of Texas and one
         certificate dated the Execution Date and executed by the corporate
         secretary or assistant secretary of the Company.

                 (c)         Certificates (dated within twenty days prior to
         the Execution Date) of existence and good standing of the Company from
         appropriate officials of Texas.

                 (d)         The written opinions of counsel to the Company and
         counsel to the Agents, substantially in the form set out in Exhibits
         E-1 and E-2, respectively, each dated the Effective Date.

                 (e)         An Administrative Questionnaire (dated any date
         prior to the Effective Date) completed by each Bank which is a party
         hereto on the Effective Date.

                 (f)         Such other agreements, documents, instruments,
         opinions, certificates, and evidences as the Administrative Agent may
         reasonably request prior to the Effective Date.

         Section 3.2         Conditions Precedent to Each Committed Borrowing.
The obligation of each Bank to make a Committed Loan on the occasion of any
Committed Borrowing (including the initial Committed Borrowing) shall be
subject to the further conditions





                                      -44-
<PAGE>   50
precedent that on the date of such Committed Borrowing the following statements
shall be true (and each of the giving of the applicable Notice of Committed
Borrowing and the acceptance by the Company of the proceeds of such Committed
Borrowing shall constitute a representation and warranty by the Company that on
the date of such Committed Borrowing such statements are true):

                 (a)         The representations and warranties contained in
         Article IV (except Section 4.5) are correct in all material respects
         on and as of the date of such Committed Borrowing (or, if any such
         representation or warranty is expressly stated to have been made as of
         a specific date, as of such specific date), before and after giving
         effect to such Committed Borrowing, as though made on and as of such
         date;

                 (b)         No event has occurred and is continuing, or would
         result from such Committed Borrowing, which constitutes either a
         Default or an Event of Default; and

                 (c)         Following the making of such Committed Borrowing
         and all other Borrowings to be made on the same day under this
         Agreement, the aggregate principal amount of all Loans then
         outstanding shall not exceed the Total Commitment.

         Section 3.3         Conditions Precedent to Each Competitive
Borrowing.  The obligation of each Bank to make a Competitive Loan as part of a
Competitive Borrowing (including the initial Competitive Borrowing) is subject
to the further conditions precedent that (a) the Auction Administration Agent
and the Administrative Agent shall have received a Competitive Bid Request with
respect thereto, and (b) on the date of such Competitive Borrowing the
following statements shall be true (and each of the giving of the applicable
Competitive Bid Request and the acceptance by the Company of the proceeds of
such Competitive Borrowing shall constitute a representation and warranty by
the Company that on the date of such Competitive Borrowing such statements are
true):

                 (a)         The representations and warranties contained in
         Article IV (except Section 4.5) are correct in all material respects
         on and as of the date of such Competitive Borrowing (or if any such
         representation or warranty is expressly stated to have been made as of
         a specific date, as of such specific date), before and after giving
         effect to such Competitive Borrowing, as though made on and as of such
         date;





                                      -45-
<PAGE>   51
                 (b)         No event has occurred and is continuing, or would
         result from such Competitive Borrowing, which constitutes either a
         Default or an Event of Default; and

                 (c)         Following the making of such Competitive Borrowing
         and all other Borrowings to be made on the same day under this
         Agreement, the aggregate principal amount of all Loans then
         outstanding shall not exceed the Total Commitment.

         Section 3.4         Legal Details.  All documents executed or
submitted pursuant hereto by the Company shall be reasonably satisfactory in
form and substance to the Documentation Agent and the Administrative Agent and
their counsel.  The Administrative Agent shall, promptly following satisfaction
of the conditions specified in Section 3.1, notify the Company and each of the
Banks of such satisfaction and the date of the Effective Date.  The
Administrative Agent and its counsel shall receive all information, and such
counterpart originals or certified or other copies of such materials, as they
may reasonably deem necessary or appropriate.  All legal matters incident to
the transactions contemplated by this Agreement (including without limitation
matters arising from time to time as a result of changes occurring with respect
to any Laws) shall be reasonably satisfactory to counsel to the Documentation
Agent and the Administrative Agent.


                                  ARTICLE IV

                        REPRESENTATIONS AND WARRANTIES

                 The Company represents and warrants to the Agents and Banks as
follows:

         Section 4.1         Organization, Authority, and Qualifications.

                 (a)         The Company and each of its Material Subsidiaries
         is a corporation duly organized, validly existing, and in good
         standing under the Laws of the jurisdiction of its incorporation;

                 (b)         The Company has the corporate power and authority
         to execute, deliver, and perform this Agreement and the other Loan
         Papers and to borrow hereunder;





                                      -46-
<PAGE>   52
                 (c)         On the Execution Date, the Company and each of its
         Material Subsidiaries is duly qualified as a foreign corporation to do
         business and is in good standing in every jurisdiction where the
         character of its Properties or nature of its activities make such
         qualification necessary, except where the failure to be so qualified
         or in good standing would not have a Material Adverse Effect; and

                 (d)         On the Execution Date, the Company has no Material
         Subsidiaries.

         Section 4.2         Financial Statements.  The Current Financials
present fairly the consolidated financial position of the Company and its
Subsidiaries on the date thereof and the consolidated results of operations and
changes in financial position of the Company and its Subsidiaries for the
period then ended, all in conformity with GAAP.  Except for transactions
related to or contemplated by the Loan Papers and transactions disclosed in
writing to the Administrative Agent before the Execution Date, there has been
no Material Adverse Change between the date or dates of the Current Financials
and the Execution Date.

         Section 4.3         Compliance with Agreement and Laws.  On the
Execution Date, neither the Company nor any of its Material Subsidiaries is in
default in any material respect under the provisions of any instrument
evidencing any material obligation, indebtedness, or liability of the Company
or any of its Material Subsidiaries or of any agreement relating thereto.
Neither the Company nor any of its Material Subsidiaries is in violation of any
Law, which default or violation would have a Material Adverse Effect.

         Section 4.4         Authorization; No Breach; and Valid Agreements.
The execution, delivery, and performance of this Agreement, the borrowings
hereunder, and the execution, delivery, and performance of the other Loan
Papers by the Company have been duly authorized by all requisite corporate
action on the part of the Company and will not violate its charter or bylaws
and will not violate any Law or any order of any Tribunal, and will not
conflict with, result in a breach of the provisions of or constitute a default
under, or result in the imposition of any Lien upon the Property of the Company
pursuant to the provisions of, any material loan agreement, credit agreement,
indenture, mortgage, deed of trust, franchise, permit, license, note, contract,
or other material agreement or





                                      -47-
<PAGE>   53
instrument to which the Company is now a party.  The Loan Documents are the
valid and binding obligations of the Company and are enforceable in accordance
with their respective terms.

         Section 4.5         Litigation and Judgments.  Except as previously
disclosed to the Administrative Agent in writing, neither the Company nor any
of its Subsidiaries is either party to or aware of the threat of any Litigation
which has, in the Company's opinion, a reasonable probability of success and
which, if determined adversely to the Company or such Subsidiary, would have a
Material Adverse Effect.  To the knowledge of the Company, on the Execution
Date there is no outstanding unsatisfied money judgment against the Company or
any of its Subsidiaries in an amount in excess of $50,000,000, and there are no
outstanding unsatisfied money judgments against the Company or any of its
Subsidiaries which individually or in the aggregate have or would have a
Material Adverse Effect.

         Section 4.6         Ownership of Properties.  The Company and each of
its Material Subsidiaries has good and marketable title (except for Permitted
Liens) or valid leasehold interests in all of its material Properties which are
owned or used in connection with its business.

         Section 4.7         Taxes.  To the extent that failure to do so would
have a Material Adverse Effect, the Company and each of its Material
Subsidiaries has filed all Tax returns or reports required of it and has paid
all Tax liability shown thereon as due to the extent the same has become due
and before it may have become delinquent (except to the extent being contested
in good faith by appropriate proceedings and for which adequate reserves have
been established).  The federal income tax liability of the Company and its
Subsidiaries has been audited by the Internal Revenue Service and has been
finally determined and satisfied for all taxable years up to and including the
taxable year ended December 31, 1986.

         Section 4.8         Approvals Required.  Neither the execution and
delivery of this Agreement and the other Loan Papers by the Company, nor the
consummation by the Company of any of the transactions contemplated hereby or
thereby requires the consent or approval of, the giving of notice to, or the
registration, recording, or filing of any document with, or the taking of any
other action in respect of any Tribunal except for the routine filing of copies
of this Agreement and certain other Loan Papers with the Securities and
Exchange Commission, except for any of the foregoing required of any Bank or
Agent.





                                      -48-
<PAGE>   54
         Section 4.9         Business; Status as Air Carrier.  The Company is
an air carrier engaged in scheduled air transportation and is in all material
respects duly qualified and licensed under all applicable Laws to carry on its
business as a scheduled airline currently subject to regulation by the Federal
Aviation Administration and the Department of Transportation.

         Section 4.10        ERISA Compliance.  The Company is in compliance in
all material respects with ERISA and the rules and regulations thereunder.  The
Company has no material unfunded vested liability under any Plan.

         Section 4.11        Insurance.  The Company maintains with insurance
companies or associations of recognized responsibility (or, as to workers'
compensation or similar insurance, with an insurance fund or by self-insurance
authorized by the jurisdictions in which it operates) insurance concerning its
Properties and businesses against such casualties and contingencies and of such
types and in such amounts (and with co-insurance, self-insurance and
deductibles) as is customary in the case of same or similar businesses.

         Section 4.12        Purpose of Loan.  Less than 25% of the value of
the assets of the Company (individually) and the Company and its Subsidiaries
(determined on a consolidated basis) that are subject to the restrictions in
Section 5.12 and Section 5.13 is attributable to Margin Stock.  The proceeds of
the Loans will be used for general corporate purposes, including acquisitions,
and no part of the proceeds of any Loan will be used for any purpose which
would violate, or be inconsistent with, any of the margin regulations of the
Board.

         Section 4.13        Investment Company Act.  Neither the Company nor
any of its Subsidiaries is an "investment company" or an "affiliated person"
of, or "promoter" or "principal underwriter" for, an "investment company", as
such terms are defined in the Investment Company Act of 1940, as amended.

         Section 4.14        General.  As of the Execution Date, there is no
material fact or condition relating to the Loan Papers or the financial
condition and business of the Company and its





                                      -49-
<PAGE>   55
Subsidiaries which has a Material Adverse Effect and which has not been
related, in writing, to the Administrative Agent, other than industry-wide
risks in the ordinary course of business associated with the types of business
conducted by the Company and its Subsidiaries.  All writings exhibited or
delivered to any of the Agents and Banks by or on behalf of the Company are and
will be genuine and in all material respects what they purport and appear to
be.


                                  ARTICLE V

                                  COVENANTS

         So long as the Company may borrow hereunder and until the Obligation
has been paid in full, the Company covenants as follows:

         Section 5.1         Performance of Obligations.  The Company shall
duly and punctually pay and perform each of the Obligations under this
Agreement and the other Loan Papers.

         Section 5.2         Compliance with Laws.  The Company shall comply,
and shall cause each of its Material Subsidiaries to comply, in all material
respects with all applicable Laws, except for any noncompliance which
individually or in the aggregate would not have a Material Adverse Effect, and
such compliance shall include, without limitation, paying before the same
become delinquent all Taxes imposed upon the Company or any of its Material
Subsidiaries or its or their Properties, except to the extent contested
diligently and in good faith by proper proceedings, and for which adequate
reserves are established in accordance with GAAP.

         Section 5.3         Maintenance of Existence, Licenses and Franchises;
Compliance With Agreements.  Except to the extent otherwise permitted in
Article V, the Company shall maintain, and shall cause each of its Material
Subsidiaries to maintain, its existence, and the Company shall preserve and
maintain, and shall cause each of its Material Subsidiaries to preserve and
maintain, all material licenses, privileges, franchises, certificates,
authorizations, and other permits and agreements necessary for the operation of
its business.  The Company shall comply, and shall cause each of its Material
Subsidiaries to comply, with all material agreements binding on it or affecting
its properties or business, except for any noncompliance which individually or
in the aggregate would not have a Material Adverse Effect.





                                      -50-
<PAGE>   56
         Section 5.4         Maintenance of Properties.  The Company shall, and
shall cause each of its Material Subsidiaries to, cause all of its Properties
used or useful in the conduct of its business to be maintained and kept in good
condition, repair, and working order, and supplied with all necessary
equipment, and cause to be made all necessary repairs, renewals, replacements,
betterments, and improvements thereof, all as in the judgment of the Company
may be necessary so that the business carried on in connection therewith may be
properly and advantageously conducted at all times.  Subject to the provisions
of this Section 5.4, the Company shall, at its expense, maintain, service,
repair, overhaul, improve, and rebuild the Aircraft so as to keep all Aircraft
in as good a condition as presently exists or as when acquired by the Company
if any Aircraft are hereafter acquired (ordinary wear and tear excepted), and
as required to meet the air-worthiness standards of the Federal Aviation
Administration and the Department of Transportation (to the extent such
standards are applicable to the Aircraft) or the standards observed by the
Company with respect to Property of similar type, whichever is higher.  The
Company shall comply with all applicable mandatory maintenance, service,
repair, and overhaul manuals issued by the respective manufacturers of the
Aircraft.  The Company shall comply with all Laws of Tribunals having
jurisdiction over the Company or the Aircraft, including all applicable
requirements of the Federal Aviation Administration and the Department of
Transportation as to operation, maintenance, or use of the Aircraft.  In the
event that any such Law requires alteration of any Aircraft, the Company shall
conform thereto or obtain conformance therewith at no expense to the Agents or
the Banks and will maintain such Aircraft in proper operating condition under
such Laws; provided, however, that the Company may, in good faith, contest the
validity or application of any such Law in any reasonable manner which does not
materially adversely affect the Rights of the Agents or the Banks.

         Section 5.5         Maintenance of Books and Records.  The Company
shall, and shall cause each of its Subsidiaries to, maintain proper books of
record and account in which full, true, and correct entries in accordance with
GAAP consistently applied (except for any change with which the Company's
independent auditors concur) will be made of all dealings and transactions in
relation to their business and activities.





                                      -51-
<PAGE>   57
         Section 5.6         Inspection.  At reasonable times and upon
reasonable notice, the Company shall permit, and shall cause each of its
Material Subsidiaries to permit, any employees and other representatives of the
Administrative Agent or any Bank to visit and inspect any Properties, to
examine all books of account, records, reports, and other papers, to make
copies and extracts therefrom (subject to any confidentiality agreements,
copyright restrictions, and similar limitations), and to discuss the Company's
and Material Subsidiaries' affairs, finances, Properties, condition (financial
or otherwise) and accounts with the Company's and Material Subsidiaries'
officers, employees and independent certified public accountants, at such times
and as often as may be reasonably requested; provided, however, that (a) any
such inspection which includes Aircraft shall be a visual, walk-around
inspection and may not include opening any panels, bays or the like of any
Aircraft, (b) no exercise of any inspection rights provided for in this Section
5.6 shall interfere with the normal operation or maintenance of the Aircraft
by, or the business of, the Company, and (c) the Administrative Agent and each
Bank shall cause their respective employees and representatives to hold in
strict confidence all information acquired pursuant to such Agent's or Bank's
Rights under this Section 5.6, except for necessary disclosure to participants
in the Loans or Commitments, disclosure in connection with disputes relating to
the Loan Papers, or disclosure compelled by judicial or administrative process
or by other requirements of Law.

         Section 5.7         Insurance.  The Company shall maintain insurance
with such insurers, in such amounts (including by way of self-insurance and
deductibles), in such forms and covering such risks as may be then customary in
the domestic airlines industry.  Without in any way limiting the foregoing, the
Company shall maintain such insurance on the Aircraft, including "all-risk"
hull insurance and aviation liability insurance.

         Section 5.8         Appraisals.  On each Appraisal Delivery Date, the
Company shall submit an Appraisal of the Pool Assets to the Administrative
Agent as of the date which is 30 days prior to such Appraisal Delivery Date;
provided, however, that if such Appraisal is to be delivered on such Appraisal
Delivery Date as a consequence of clause (b) of the definition thereof, the
Appraisal to be delivered on such date shall only be in respect of the assets
to be removed from and/or added to the Pool Assets.





                                      -52-
<PAGE>   58
         Section 5.9         Coverage Ratio.  The Company shall maintain at all
times a Coverage Ratio of not less than 1.25 to 1.0.

         Section 5.10        Reporting Requirements.  The Company shall furnish
to the Administrative Agent (with sufficient copies for each Bank):

                 (a)         Within 120 days after the last day of each fiscal
         year of the Company, Financial Statements (it being understood that
         delivery of the Company's annual report on Form 10-K for any fiscal
         year as filed with the Securities and Exchange Commission pursuant to
         the Securities Exchange Act of 1934, as amended, will satisfy this
         requirement with respect to such fiscal year) showing the consolidated
         financial condition and results of operations of the Company and its
         Subsidiaries as of, and for the year ended on, such last day,
         accompanied by (i) the opinion, without material qualification, of
         Auditors, based on an audit using generally accepted auditing
         standards, that such Financial Statements were prepared in accordance
         with GAAP and present fairly the consolidated financial condition and
         results of operations of the Company and its consolidated Subsidiaries
         and (ii) a Financial Report Certificate;

                 (b)         Within 60 days after the last day of each of the
         first three fiscal quarters of the Company (i) Financial Statements
         showing the consolidated financial condition and results of operations
         of the Company and its consolidated Subsidiaries as of, and for the
         period from the beginning of the current fiscal year to, such last day
         (it being understood that delivery of the Company's quarterly report
         on Form 10-Q for any fiscal quarter as filed with the Securities and
         Exchange Commission pursuant to the Securities Exchange Act of 1934,
         as amended, will satisfy this requirement with respect to such fiscal
         quarter and, if applicable, the portion of the Company's fiscal year
         ended at the end of such quarter), and (ii) a Financial Report
         Certificate;

                 (c)         (i) Promptly after mailing, true copies of all
         reports, statements, documents, plans, and other written
         communications furnished by or on behalf of the Company or any of its
         Subsidiaries to stockholders generally and (ii) promptly upon the
         filing thereof, copies of all registration statements (other than the
         exhibits thereto and any





                                      -53-
<PAGE>   59
         registration statements on Form S-8 or its equivalent) and reports on
         Forms 10-K, 10-Q and 8-K (or their equivalents) which the Company
         shall have filed with the Securities and Exchange Commission;

                 (d)         Notice, promptly after the Company or any of its
         Material Subsidiaries knows or has reason to know of a Default or
         Event of Default, specifying the nature thereof and what action the
         Company or any Subsidiary has taken, is taking, or proposes to take
         with respect thereto;

                 (e)         Prompt notice of any legal or arbitral
         proceedings, and of all proceedings by or before any governmental or
         regulatory authority or agency, and any material development in
         respect of such legal or other proceedings, affecting the Company,
         except proceedings which, if adversely determined, would not have a
         Material Adverse Effect or proceedings with respect to which the
         Company, in good faith and upon consultation with outside counsel,
         believes an adverse determination in respect thereof to be unlikely;
         and

                 (f)         Promptly upon the Administrative Agent's
         reasonable request, such other relevant information (not otherwise
         required to be furnished under the Loan Papers) respecting the
         business affairs, assets, and liabilities of the Company and any of
         its Material Subsidiaries.

         Section 5.11        Use of Proceeds.  Proceeds advanced hereunder
shall be used only as represented herein.

         Section 5.12        Restrictions on Sale-Leaseback Transactions; Pool
Assets.

                 (a)         At all times prior to the Asset Pool Date, neither
         the Company nor any of its consolidated Subsidiaries will engage in
         any Sale-Leaseback Transaction unless the amount of Sale-Leaseback
         Debt resulting from such transaction, plus the aggregate of all other
         Sale-Leaseback Debt then existing, does not at the time exceed 10% of
         Consolidated Net Tangible Assets; provided, however, if a
         Sale-Leaseback Transaction would result in Sale-Leaseback Debt
         exceeding such 10% limitation, then such Sale-Leaseback Transaction
         shall be permitted if such excess amount of the Sale-Leaseback Debt
         (i) were treated as Debt secured by a Lien, and (ii) would not,





                                      -54-
<PAGE>   60
         together with all other Debt of the Company and its Subsidiaries
         existing at the time and secured by Liens not excepted pursuant to
         Section 5.13(a), exceed the limitation imposed by Section 5.13(b).

                 (b)         At all times on or after the Asset Pool Date, the
         Company (i) will ensure that the Appraised Value of the Pool Assets
         shall satisfy the Collateral Coverage Test (based upon the most recent
         Appraisal delivered to the Administrative Agent and the Banks pursuant
         to the provisions of Section 5.8), and (ii) will not convey, sell,
         lease, transfer or otherwise dispose of, whether voluntarily or
         involuntarily (it being understood that loss of property due to theft,
         destruction, confiscation, prohibition on use or similar event shall
         constitute a disposal for purposes of this covenant), or remove or
         substitute, any Pool Asset (or any engine included in the Pool Assets
         unless such engine is replaced by another working engine or engines of
         comparable value, assuming half-time condition) or agree to do any of
         the foregoing at any future time, except that:

                             (1)          so long as no Event of Default
                 exists, the Company may replace a Pool Asset with another
                 asset of the Company (and Schedule II shall be modified to
                 reflect such replacement), provided that (A) such replacement
                 shall be made on a dollar-for-dollar basis based upon (x) in
                 the case of the asset being removed from the Pool Assets, the
                 Appraised Value of such Pool Asset (as determined by the most
                 recently delivered Appraisal with respect to such Pool Asset)
                 and (y) in the case of the asset being added to the Pool
                 Assets, the Appraised Value of such asset (as determined by an
                 Appraisal performed at the time of such replacement), and (B)
                 prior to effecting the replacement, the Company shall have
                 delivered a certificate of the Company signed by its duly
                 authorized officer to the Administrative Agent certifying
                 compliance with this Section 5.12(b) and attaching to such
                 certificate the Appraisal required by Section 5.8;

                             (2)          so long as no Event of Default exists
                 or would result therefrom, the Company may remove an asset
                 from the Pool Assets (and Schedule II shall be modified to
                 reflect such removal), provided that (A) after giving effect
                 to such removal, the Appraised Value of the





                                      -55-
<PAGE>   61
                 remaining Pool Assets (as determined by an Appraisal of all
                 Pool Assets performed at the time of such removal) shall
                 satisfy the Collateral Coverage Test, and (B) prior to
                 effecting the removal, the Company shall have delivered a
                 certificate of the Company signed by its duly authorized
                 officer to the Administrative Agent certifying that, and
                 providing calculations demonstrating that, after giving effect
                 to such removal, the Appraised Value of the Pool Assets shall
                 satisfy the Collateral Coverage Test, and otherwise certifying
                 compliance with this Section 5.12(b) and attaching to such
                 certificate Appraisals of all Pool Assets obtained in
                 connection with such removal; and

                             (3)          in the event (x) that an Appraisal
                 furnished pursuant to Section 5.8 discloses that the
                 Collateral Coverage Test is not satisfied or (y) the
                 Collateral Coverage Test is not satisfied following an
                 involuntary disposal of any Pool Asset (or any engine included
                 in the Pool Assets unless such engine is replaced by another
                 working engine or engines of comparable value, assuming
                 half-time condition) (whether by loss of property due to
                 theft, destruction, confiscation, prohibition on use, any
                 similar event or otherwise), based upon the most recent
                 Appraisal of the Pool Assets (from which the appraised values
                 of the Pool Assets which are the subject of the involuntary
                 disposition shall be subtracted) furnished pursuant to Section
                 5.8, the Company shall within 60 days after the date of such
                 Appraisal or involuntary disposal, as the case may be,
                 designate additional assets as Pool Assets to the extent that,
                 after giving effect to such designation the Appraised Value of
                 the Pool Assets, based on the most recently delivered
                 Appraisal with respect to assets already constituting Pool
                 Assets and based on an Appraisal performed at the time of such
                 addition with respect to assets being added to Pool Assets,
                 shall satisfy the Collateral Coverage Test (and Schedule II
                 shall be modified to reflect such addition), provided that (A)
                 at the time of such addition, the Administrative Agent and the
                 Banks shall have received a certificate of the Company signed
                 by its duly authorized officer certifying that the conditions
                 set forth in this Section 5.12(b) shall have been satisfied
                 after giving effect to such addition and attaching thereto
                 such Appraisal, and (B) the asset being added shall constitute
                 Stage 3 Equipment.





                                      -56-
<PAGE>   62
         Section 5.13        Restrictions on Liens.

                 (a)         At all times prior to the Asset Pool Date, the
         Company will not, nor will it permit any Material Subsidiary to,
         issue, assume or guarantee any Debt directly or indirectly secured or
         collateralized by any Lien of or upon any Property of the Company or
         any Material Subsidiary (including without limitation shares of
         capital stock or indebtedness issued by any Material Subsidiary),
         whether such Property is owned at the date of this Agreement or
         hereafter acquired, without making effective provision whereby the
         Obligation (together with, if the Company shall so determine, any
         other Debt issued, assumed or guaranteed by the Company or any
         Material Subsidiary ranking equally with the Obligation and then
         existing or thereafter created) shall be secured by such Lien equally
         and ratably with (or, at the option of the Company, prior to) such
         Debt, so long as such Debt shall be so secured or collateralized;
         provided that the foregoing shall not apply to, nor prevent the
         creation or existence of, any of the following:

                             (1)          Liens of or upon any Property owned
                 by the Company or any Material Subsidiary at the date of this
                 Agreement or thereafter acquired or constructed by the Company
                 or any Material Subsidiary, to secure any Debt issued, assumed
                 or guaranteed by the Company or any Material Subsidiary (i)
                 for the purpose of financing or refinancing all or any part of
                 the purchase price or cost of construction of such Property
                 and (ii) prior to, at the time of, or within 270 days after
                 the later of the acquisition, completion of construction or
                 commencement of commercial operation of such Property;

                             (2)          in addition to Liens contemplated by
                 clauses (3) and (4) below, Liens of or upon any Property which
                 existed at the time of acquisition of such Property (provided
                 such Liens shall not extend to any Property theretofore owned
                 by the Company or any Material Subsidiary);





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<PAGE>   63
                             (3)          Liens of or upon any Property of a
                 corporation, which Liens exist at the time such corporation is
                 merged with or into or consolidated with the Company or any
                 Material Subsidiary;

                             (4)          Liens of or upon any Property of a
                 corporation, which Liens exist at the time such corporation
                 becomes a Material Subsidiary;

                             (5)          Liens to secure Debt of any Material
                 Subsidiary to the Company or to another Material Subsidiary or
                 to secure Debt of the Company to any Material Subsidiary;

                             (6)          Liens in favor of any Tribunal to
                 secure partial, progress, advance or other payments pursuant
                 to any contract or statute or to secure any Debt incurred for
                 the purpose of financing all or any part of the purchase price
                 or cost of constructing or improving the Property subject to
                 such Liens, including without limitation Liens to secure Debt
                 of the industrial revenue bond type;

                             (7)          Liens of or upon deposits of cash or
                 cash equivalents in favor of banks or other depository
                 institutions;

                             (8)          any Lien created as a result of a
                 Sale-Leaseback Transaction permitted by Section 5.12(a), other
                 than a Sale-Leaseback Transaction permitted by virtue of the
                 proviso clause thereof;

                             (9)          Permitted Liens;

                             (10)         pledges or deposits under worker's
                 compensation, unemployment insurance and other social security
                 legislation (other than ERISA);

                             (11)         deposits to secure the performance of
                 bids, trade contracts (other than for borrowed money), leases,
                 statutory obligations, surety and appeal bonds, performance
                 bonds and other obligations of a like nature incurred in the
                 ordinary course of business;





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<PAGE>   64
                             (12)         easements, rights-of-way,
                 restrictions and other similar encumbrances incurred in the
                 ordinary course of business and encumbrances consisting of
                 zoning restrictions, easements, licenses, restrictions on the
                 use of Property or minor imperfections in title thereto which,
                 in the aggregate, are not material in amount, and which do not
                 in any case materially detract from the value of the Property
                 subject thereto or interfere with the ordinary conduct of the
                 business of the Company or any of its Material Subsidiaries;
                 or

                             (13)         any extension, renewal or replacement
                 (or successive extensions, renewals or replacements) in whole
                 or in part of Debt secured by any Lien existing at the date of
                 this Agreement or any Lien referred to in the foregoing
                 clauses (1) through (12), inclusive; provided, however, that
                 the principal amount of Debt secured thereby shall not exceed
                 the principal amount of Debt so secured at the time of such
                 extension, renewal or replacement, and that such extension,
                 renewal or replacement shall be limited to all or a part of
                 the Property (plus improvements and construction on such
                 Property), which was subject to the Lien securing the Debt so
                 extended, renewed or replaced.

                 (b)         Notwithstanding the provisions of subsection (a)
         of this Section 5.13, the Company or any Material Subsidiary may,
         without equally and ratably securing the Obligation, issue, assume or
         guarantee any Debt secured by a Lien not excepted by clauses (1)
         through (13) of such subsection (a), if the aggregate amount of such
         Debt, together with all other Debt of the Company and its Material
         Subsidiaries existing at such time and secured by Liens not so
         excepted, does not at the time exceed 10% of Consolidated Net Tangible
         Assets.

                 (c)         In the event the Company shall directly or
         indirectly secure or collateralize any Debt by any Lien of or upon any
         Aircraft, then the Company shall be deemed to have satisfied any
         resulting obligations under subsection (a) of this Section 5.13 to
         secure the Obligation equally and ratably with such Debt, if it shall
         secure or collateralize the Obligation with a Lien of the same type
         and rank of or upon other Aircraft, which other Aircraft shall have no
         less equivalent value relative to the aggregate principal amount of





                                      -59-
<PAGE>   65
         the Obligation than the Aircraft first referred to have in relation to
         the aggregate principal amount of such Debt.  All such Liens granted
         to or for the benefit of the Banks shall be granted and perfected
         pursuant to documentation reasonably satisfactory to the
         Administrative Agent and its counsel.

                 (d)         At all times on or after the Asset Pool Date, the
         Company will not, nor will it permit any Material Subsidiary to,
         create, assume or suffer to exist any Lien upon or with respect to the
         Pool Assets, or enter into any arrangement with any Person that would
         materially negatively impact the value of any Pool Asset realizable by
         any third party or assign any right to receive the proceeds from the
         sale, transfer or disposition of any of the Pool Assets, or file or
         suffer to exist the filing with respect to any of the Pool Assets of
         any financing statement naming the Company or any Material Subsidiary
         as debtor under the Uniform Commercial Code or any similar notice of
         Lien naming the Company or any Material Subsidiary as debtor under any
         similar recording or notice statute (including, without limitation,
         any filing under Title 49, United States Code, Section 44107), other
         than Permitted Liens affecting Pool Assets.

                 (e)         At all times on or after the Asset Pool Date, the
         Company will not enter into or suffer to exist, and will not permit
         any of its Material Subsidiaries to enter into or suffer to exist, any
         agreement prohibiting or conditioning the creation or assumption of
         any Lien upon any Pool Asset.

         Section 5.14        Mergers and Dissolutions.  Neither the Company nor
any Subsidiary will merge or consolidate with any Person other than any merger
or  consolidation whereby the Company (or, if the Company is not involved, the
Subsidiary) is the surviving corporation and no Default or Event of Default
exists or would result therefrom. Neither the Company nor any Subsidiary
(excluding any Subsidiary existing on the Execution Date to the extent that it
does not contribute more than two percent of the consolidated net income or own
more than two percent of the consolidated assets of the Company and its
Subsidiaries at the time of any such liquidation or dissolution) will
liquidate, wind up, or dissolve itself (or suffer any liquidation or
dissolution).





                                      -60-
<PAGE>   66
         Section 5.15        Assignment.  The Company will not assign or
transfer any of its Rights, duties, or obligations under any of the Loan
Papers.


                                  ARTICLE VI

                          EVENTS OF DEFAULT; REMEDIES

         Section 6.1         Events of Default.  Any one or more of the
following events shall be "Events of Default" hereunder (which shall include by
definition the expiration of any grace period with respect thereto), whether
the same shall occur and be continuing for any reason whatsoever (and whether
such occurrence shall be voluntary or involuntary or come about or be effected
by operation of Law or otherwise):

                 (a)         Payment of Obligation.  Failure to pay any
         installment of principal on any Loan when due whether at maturity, by
         declaration as authorized by this Agreement, or otherwise; or failure
         to pay, within 10 days after the due date thereof, any interest on any
         Loan; or failure to pay, within 10 days after the due date thereof, or
         if no due date therefor is herein specified within 10 days after
         written demand therefor is given to the Company by the Administrative
         Agent, any other amount payable by the Company hereunder or under any
         of the other Loan Papers.

                 (b)         Covenants.  Default shall be made in the
         observance or performance of any other of the covenants, conditions,
         and agreements on the part of the Company contained herein, or in any
         other Loan Papers and such default shall continue for a period of 30
         days after the Administrative Agent shall have given the Company
         notice thereof in writing.

                 (c)         Debtor Relief.  The Company or any Material
         Subsidiary shall file a voluntary petition in bankruptcy or a petition
         or answer seeking reorganization, arrangement, composition,
         liquidation, receivership, or similar relief under any Debtor Relief
         Law, or shall file a petition to take advantage of any Debtor Relief
         Law, or shall make an assignment for the benefit of creditors, or
         shall admit in writing its inability to pay its debts as they become
         due, or shall fail generally to pay its debts as they become due, or





                                      -61-
<PAGE>   67
         shall consent to the appointment of any receiver, trustee, custodian
         or liquidator of it or all or a substantial part of its Property; or a
         proceeding or action shall be instituted or commenced against the
         Company or any Material Subsidiary seeking an order for relief or a
         reorganization, arrangement, composition, liquidation, receivership,
         or similar relief under any Debtor Relief Law or seeking the
         appointment, without the consent of the Company or any Material
         Subsidiary, of any receiver, trustee, custodian or liquidator of it or
         all or a substantial part of the Property of the Company or any
         Material Subsidiary and such proceeding or action shall remain
         undismissed or unstayed for a period of 90 days; or an order, decree,
         or judgment for an involuntary petition adjudicating the Company or
         any Subsidiary insolvent shall be entered by any court of competent
         jurisdiction and shall remain undismissed or unstayed for a period of
         90 days.

                 (d)         Payment of Judgments.  The Company or any of its
         Material Subsidiaries fails to pay any judgment or order for the
         payment of money in excess of $25,000,000 rendered against it or any
         of its assets (exclusive of judgment amounts fully covered by
         insurance where the insurer has admitted liability in respect thereof)
         and either (i) any enforcement proceedings shall have been commenced
         by any creditor upon such judgment or order or (ii) the same shall not
         be discharged (or provisions shall not be made for such discharge), or
         a stay of execution thereof shall not be procured, within 30 days from
         the date of entry thereof and the Company or the relevant Material
         Subsidiary shall not, within said period of 30 days, or such longer
         period during which execution of the same shall have been stayed,
         appeal therefrom and cause the execution thereof to be stayed during
         such appeal.

                 (e)         Default on Other Debt or Security.  The Company or
         any Material Subsidiary shall (i) fail to pay any principal of or
         interest on any Debt (other than the Obligation) the principal or face
         amount of which exceeds $25,000,000 when due (or, where permitted,
         within any applicable grace period), whether by scheduled maturity,
         required prepayment, acceleration, demand or otherwise and such
         default continues unremedied for five Business Days after such due
         date or applicable grace period, or (ii) fail to perform or observe
         any other provision (other than a provision that is substantially
         identical to a provision in this Agreement)





                                      -62-
<PAGE>   68
         contained in any agreement securing or relating to such Debt (or any
         other breach or default under such Debt agreement occurs) if the
         effect of such failure to perform or observe such other provisions (or
         breach or default) is to cause such Debt to become due prior to its
         stated maturity; provided, however, that if any such failure, breach
         or default shall be waived or cured (as evidenced by a writing from
         such holder or trustee) then, to the extent of such waiver or cure,
         the Event of Default hereunder by reason of such failure, breach or
         default shall be deemed likewise to have been thereupon waived or
         cured.

                 (f)         ERISA.  Any "Reportable Event" as such term is
         defined in ERISA under any Plan, or the appointment by an appropriate
         Tribunal of a trustee to administer any Plan, or the termination of
         any Plan within the meaning of Title IV of ERISA, and any of the
         foregoing results in a material liability to the Pension Benefit
         Guaranty Corporation; or any material accumulated funding deficiency
         within the meaning of ERISA exists under any Plan.

                 (g)         Misrepresentation.  Any representation or warranty
         made by the Company is untrue in any material respect, or any
         certificate, schedule, statement, report, notice or writing (excluding
         any Appraisal, for which the Company makes no representation)
         furnished by the Company to the Agents or to the Banks, or any of
         them, is untrue in any material respect on the date as of which the
         facts set forth are stated or certified, shall remain material at the
         time of discovery and shall, if curable, remain incorrect in any
         material respect after 30 days after written notice thereof to the
         Company (any failure to include within any such schedule, statement,
         report, notice, or writing information which failure would cause the
         material included to be misleading shall be as much an untruth as a
         false statement contained therein).

         Section 6.2         Remedies Upon Default.  If an Event of Default
specified in Section 6.1(c) occurs, the Commitments of the Banks shall
thereupon automatically terminate and the aggregate unpaid principal balance of
and accrued interest on the Obligation shall thereupon become due and payable
concurrently therewith, without any action by the Administrative Agent or any
Bank and without diligence, presentment, demand, protest, notice of protest or
intent to accelerate, or notice of any other kind, all of which are





                                      -63-
<PAGE>   69
hereby expressly waived.  Except as set forth in the preceding sentence, should
any Event of Default occur and be continuing, the Administrative Agent may, and
if requested by the Majority Banks, shall, do any one or more of the following:

                 (a)         Acceleration.  Declare (by written notice to the
         Company) the entire unpaid balance of the Obligation, or any part
         thereof, immediately due and payable, whereupon it shall be due and
         payable, without diligence, presentment, demand, protest, notice of
         protest or intent to accelerate, or other notice of any kind (except
         any notice or demand specified in this Agreement), all of which are
         hereby expressly waived.

                 (b)         Termination.  Terminate the Commitments by written
         notice to the Company.

                 (c)         Judgment.  Reduce any claim to judgment.

                 (d)         Rights.  Exercise any and all legal and equitable
         Rights available to it.

         Section 6.3         Remedies in General.  If any Event of Default
shall occur and be continuing, the Administrative Agent may immediately proceed
to protect and enforce all or any Rights with respect thereto contained in this
Agreement or any other Loan Papers or may enforce any other legal or equitable
Rights.  Any Right may be exercised from time to time, independently or
concurrently, and as often as shall be deemed expedient.  No waiver of any
Event of Default shall extend to any subsequent Event of Default.


                                 ARTICLE VII

                                  THE AGENTS

         Section 7.1         Authorization and Action.  Each Bank hereby
irrevocably appoints and authorizes (a) TCB to act as its Administrative Agent
hereunder and under each of the other Loan Papers, (b) Chase to act as its
Auction Administration Agent hereunder and under each of the other Loan Papers,
(c) B of A to act as its Documentation Agent hereunder and under each of the
other Loan Papers, and (d) NationsBank to act as Syndication Agent hereunder.
TCB consents to such appointment and agrees to perform





                                      -64-
<PAGE>   70
the duties of the Administrative Agent hereunder and under the other Loan
Papers.  Chase consents to such appointment and agrees to perform the duties of
the Auction Administration Agent hereunder and under the other Loan Papers.  B
of A consents to such appointment and agrees to perform the duties of the
Documentation Agent hereunder and under the other Loan Papers.  NationsBank
consents to such appointment and agrees, in consultation with the Company and
the other Agents, to select a syndicate of Banks to participate in the
Commitments.  Each Bank authorizes and directs the Administrative Agent, the
Auction Administration Agent and the Documentation Agent to act on its behalf
and to exercise such powers under this Agreement as are specifically delegated
to or required of such Agent by the terms hereto, together with such powers as
are reasonably incidental thereto.  As to any matters not expressly provided
for by this Agreement or the other Loan Papers (including, without limitation,
enforcement or collection of the Loans or Notes), the Administrative Agent, the
Auction Administration Agent and the Documentation Agent shall not be required
to exercise any discretion or take any action, but shall be required to act or
to refrain from acting (and shall be fully protected in so acting or refraining
from acting) upon the instructions of the Majority Banks, and such instructions
shall be binding upon all Banks and all holders of Loans or Notes; provided,
however, that no Agent shall be required to take any action which exposes such
Agent to personal liability or which is contrary to this Agreement or
applicable Law.

         Section 7.2         Agents' Reliance, Etc.  None of the Agents and
none of their respective Affiliates, directors, officers, agents, or employees
shall be liable for any action taken or omitted to be taken by it or them under
or in connection with the Loan Papers (i) with the consent or at the request of
the Majority Banks (or the Majority Committed Banks or all the Banks, if
required) or (ii) in the absence of its or their own gross negligence or
willful misconduct (it being the express intention of the parties that the
Agents and their respective directors, officers, agents, and employees shall
have no liability for actions and omissions under this Section 7.2 resulting
from their ordinary contributory negligence).  Without limitation of the
generality of the foregoing, each Agent (i) may treat the payee of each Loan or
Note as the holder thereof until such Agent receives written notice of the
assignment or transfer thereof signed by such payee and in form satisfactory to
such Agent; (ii) may consult with legal counsel (including counsel for the
Company), independent public





                                      -65-
<PAGE>   71
accountants, and other experts selected by it and shall not be liable for any
action taken or omitted to be taken in good faith by it in accordance with the
advice of such counsel, accountants, or experts; (iii) makes no warranty or
representation to any Bank and shall not be responsible to any Bank for any
statements, warranties, or representations made by or on behalf of the Company
in or in connection with any Loan Paper; (iv) except as otherwise expressly
provided herein, shall not have any duty to ascertain or to inquire as to the
performance or observance of any of the terms, covenants, or conditions of any
Loan Paper or to inspect the property (including the books and records) of the
Company or any of its Subsidiaries; (v) shall not be responsible to any Bank
for the due execution, legality, validity, enforceability, genuineness,
sufficiency, or value of any Loan Paper or any other instrument or document
furnished pursuant hereto or thereto; and (vi) shall incur no liability under
or in respect of any Loan Paper by acting upon any notice, consent,
certificate, or other instrument or writing (which may be by telecopier)
reasonably believed by it to be genuine and signed or sent by the proper party
or parties.

         Section 7.3         Rights of Agents as Banks.  With respect to their
Commitments, the Loans, if any, made by them and the Notes, if any, issued to
them, each Bank that is an Agent (including any Agent that hereafter becomes a
holder of a Loan or Note) and its Affiliates shall have the same rights and
powers under this Agreement or any other Loan Paper as any other Bank and may
exercise the same as though it were not an Agent; and the term "Bank" or
"Banks" shall, unless otherwise expressly indicated, include each Bank that is
an Agent (including any Agent that hereafter becomes a holder of a Loan or
Note), in its individual capacity.  Each Bank that is an Agent (including any
Agent that hereafter becomes a holder of a Loan or Note) and its Affiliates may
accept deposits from, lend money to, act as trustee under indentures of, and
generally engage in any kind of business with, the Company, any of the
Subsidiaries and any Person who may do business with or own securities of the
Company or of the Subsidiaries, all as if such Bank were not an Agent, and
without any duty to account therefor to the Banks.

         Section 7.4         Bank Credit Decision.  Each Bank acknowledges and
agrees that it has, independently and without reliance upon any of the Agents
or any other Bank and based on the Current Financials and such other documents
and information as it has deemed appropriate, made its own credit analysis and
decision to enter





                                      -66-
<PAGE>   72
into this Agreement.  Each Bank also acknowledges and agrees that it will,
independently and without reliance upon any of the Agents or any other Bank and
based on such documents and information as it shall deem appropriate at the
time, continue to make its own credit decisions in taking or not taking action
under this Agreement.

         SECTION 7.5         AGENTS' INDEMNITY.  NONE OF THE AGENTS SHALL BE
REQUIRED TO TAKE ANY ACTION HEREUNDER OR TO PROSECUTE OR DEFEND ANY SUIT IN
RESPECT OF THIS AGREEMENT OR THE LOANS OR NOTES UNLESS INDEMNIFIED TO SUCH
AGENT'S SATISFACTION BY THE BANKS AGAINST LOSS, COST, LIABILITY, AND EXPENSE.
IF ANY INDEMNITY FURNISHED TO SUCH AGENT SHALL BECOME IMPAIRED, IT MAY CALL FOR
ADDITIONAL INDEMNITY AND CEASE TO DO THE ACTS INDEMNIFIED AGAINST UNTIL SUCH
ADDITIONAL INDEMNITY IS GIVEN.  IN ADDITION, THE BANKS AGREE TO INDEMNIFY EACH
AGENT OTHER THAN THE SYNDICATION AGENT (TO THE EXTENT NOT REIMBURSED BY THE
COMPANY), RATABLY ACCORDING TO THE RESPECTIVE PRINCIPAL AMOUNTS OF THE
COMMITTED LOANS THEN HELD BY EACH OF THEM (OR IF NO COMMITTED LOANS ARE AT THE
TIME OUTSTANDING, RATABLY ACCORDING TO EITHER (I) THE RESPECTIVE AMOUNTS OF
THEIR COMMITMENTS, OR (II) IF THE COMMITMENTS HAVE TERMINATED, THE RESPECTIVE
AMOUNTS OF THE COMMITMENTS IMMEDIATELY PRIOR TO SUCH TERMINATION), FROM AND
AGAINST ANY AND ALL LIABILITIES, OBLIGATIONS, LOSSES, DAMAGES, PENALTIES,
ACTIONS, JUDGMENTS, SUITS, COSTS, EXPENSES, OR DISBURSEMENTS OF ANY KIND OR
NATURE WHATSOEVER WHICH MAY BE IMPOSED ON, INCURRED BY, OR ASSERTED AGAINST
SUCH AGENT IN ANY WAY RELATING TO OR ARISING OUT OF THIS AGREEMENT OR ANY
ACTION TAKEN OR OMITTED BY SUCH AGENT UNDER THIS AGREEMENT OR THE OTHER LOAN
PAPERS (INCLUDING, WITHOUT LIMITATION, ANY ACTION TAKEN OR OMITTED UNDER
ARTICLE II OF THIS AGREEMENT); PROVIDED THAT NO BANK SHALL BE LIABLE FOR ANY
PORTION OF SUCH LIABILITIES, OBLIGATIONS, LOSSES, DAMAGES, PENALTIES, ACTIONS,
JUDGMENTS, SUITS, COSTS, EXPENSES, OR DISBURSEMENTS RESULTING FROM SUCH AGENT'S
FRAUD, GROSS NEGLIGENCE OR WILLFUL MISCONDUCT.  EACH BANK AGREES, HOWEVER, THAT
IT EXPRESSLY INTENDS, UNDER THIS SECTION 7.5, TO INDEMNIFY EACH AGENT RATABLY
AS AFORESAID FOR ALL SUCH LIABILITIES, OBLIGATIONS, LOSSES, DAMAGES, PENALTIES,
ACTIONS, JUDGMENTS, SUITS, COSTS, EXPENSES, AND DISBURSEMENTS ARISING OUT OF OR
RESULTING FROM SUCH AGENT'S ORDINARY OR CONTRIBUTORY NEGLIGENCE.  WITHOUT
LIMITATION OF THE FOREGOING, EACH BANK AGREES TO REIMBURSE EACH AGENT (OTHER
THAN THE SYNDICATION AGENT) PROMPTLY UPON DEMAND FOR ITS RATABLE SHARE OF ANY
OUT-OF-POCKET EXPENSES (INCLUDING REASONABLE COUNSEL FEES) INCURRED BY SUCH
AGENT IN CONNECTION WITH THE PREPARATION, EXECUTION, ADMINISTRATION, OR
ENFORCEMENT OF, OR LEGAL ADVICE IN RESPECT OF RIGHTS OR RESPONSIBILITIES UNDER,
THIS





                                      -67-
<PAGE>   73
AGREEMENT AND THE OTHER LOAN PAPERS TO THE EXTENT THAT SUCH AGENT IS NOT
REIMBURSED FOR SUCH EXPENSES BY THE COMPANY.  THE PROVISIONS OF THIS SECTION
7.5 SHALL SURVIVE THE TERMINATION OF THIS AGREEMENT AND/OR THE PAYMENT OR
ASSIGNMENT OF ANY OF THE LOANS OR NOTES.

         Section 7.6         Successor Administrative Agent.  The
Administrative Agent may resign at any time by giving written notice thereof to
the Banks, the Auction Administration Agent, and the Company and may be removed
as Administrative Agent under this Agreement and the other Loan Papers at any
time with or without cause by the Majority Banks.  Upon any such resignation or
removal, the Majority Committed Banks or, after termination of the Commitments,
the Majority Banks shall have the right, with the consent of the Company
(provided that the Company's consent shall not be required during the
continuance of a Default or an Event of Default), to appoint a successor
Administrative Agent.  If no successor Administrative Agent shall have been so
appointed and shall have accepted such appointment within 30 calendar days
after the retiring Administrative Agent's giving notice of resignation or the
Majority Banks' removal of the retiring Administrative Agent, then the retiring
Administrative Agent may, on behalf of the Banks, with the consent of the
Company (provided that the Company's consent shall not be required during the
continuance of a Default or Event of Default), appoint a successor
Administrative Agent, which shall be a commercial bank organized under the Laws
of the United States of America or of any state thereof and having a combined
capital and surplus of at least $500,000,000.  Upon the acceptance of any
appointment as Administrative Agent hereunder and under the other Loan Papers
by a successor Administrative Agent, such successor Administrative Agent shall
thereupon succeed to and become vested with all rights, powers, privileges and
duties of the retiring Administrative Agent, and the retiring Administrative
Agent shall be discharged from its duties and obligations under this Agreement
and the other Loan Papers.  After any retiring Administrative Agent's
resignation or removal as the Administrative Agent hereunder and under the
other Loan Papers, the provisions of this Article VII shall inure to its
benefit as to any actions taken or omitted to be taken by it while it was the
Administrative Agent under this Agreement and the other Loan Papers.

         Section 7.7         Successor Auction Administration Agent.  The
Auction Administration Agent may resign at any time by giving written notice
thereof to the Banks, the Administrative Agent, and the Company and may be
removed as Auction Administration Agent





                                      -68-
<PAGE>   74
under this Agreement and the other Loan Papers at any time with or without
cause by the Majority Banks.  Upon any such resignation or removal, the
Majority Committed Banks or, after termination of the Commitments, the Majority
Banks shall have the right, with the consent of the Company (provided that the
Company's consent shall not be required during the continuance of a Default or
an Event of Default), to appoint a successor Auction Administration Agent.  If
no successor Auction Administration Agent shall have been so appointed and
shall have accepted such appointment within 30 calendar days after the retiring
Auction Administration Agent's giving notice of resignation or the Majority
Banks' removal of the retiring Auction Administration Agent, then the retiring
Auction Administration Agent may, on behalf of the Banks, appoint a successor
Auction Administration Agent, with the consent of the Company (provided that
the Company's consent shall not be required during the continuance of a Default
or Event of Default), which shall be a commercial bank organized under the Laws
of the United States of America or of any state thereof and having a combined
capital and surplus of at least $500,000,000.  Upon the acceptance of any
appointment as Auction Administration Agent hereunder and under the other Loan
Papers by a successor Auction Administration Agent, such successor Auction
Administration Agent shall thereupon succeed to and become vested with all the
rights, powers, privileges, and duties of the retiring Auction Administration
Agent, and the retiring Auction Administration Agent shall be discharged from
its duties and obligations under this Agreement and the other Loan Papers.
After any retiring Auction Administration Agent's resignation or removal as the
Auction Administration Agent hereunder and under the other Loan Papers, the
provisions of this Article VII shall inure to its benefit as to any actions
taken or omitted to be taken by it while it was the Auction Administration
Agent under this Agreement and the other Loan Papers.

         Section 7.8         Successor Documentation Agent.  The Documentation
Agent may resign at any time by giving written notice thereof to the Banks, the
Administrative Agent, the Auction Administration Agent, and the Company and may
be removed as Documentation Agent under this Agreement and the other Loan
Papers at any time with or without cause by the Majority Banks.  Upon any such
resignation or removal, the Majority Committed Banks or, after termination of
the Commitments, the Majority Banks shall have the right, with the consent of
the Company (provided that the Company's consent shall not be required during
the continuance of a Default or an Event of Default), to appoint a successor
Documentation





                                      -69-
<PAGE>   75
Agent.  If no successor Documentation Agent shall have been so appointed and
shall have accepted such appointment within 30 calendar days after the retiring
Documentation Agent's giving notice of resignation or the Majority Banks'
removal of the retiring Documentation Agent, then the retiring Documentation
Agent may, on behalf of the Banks, appoint a successor Documentation Agent,
with the consent of the Company (provided that the Company's consent shall not
be required during the continuance of a Default or an Event of Default), which
shall be a commercial bank organized under the Laws of the United States of
America or of any state thereof and having a combined capital and surplus of at
least $500,000,000.  Upon the acceptance of any appointment as Documentation
Agent hereunder and under the other Loan Papers by a successor Documentation
Agent, such successor Documentation Agent shall thereupon succeed to and become
vested with all the rights, powers, privileges, and duties of the retiring
Documentation Agent, and the retiring Documentation Agent shall be discharged
from its duties and obligations under this Agreement and the other Loan Papers. 
After any retiring Documentation Agent's resignation or removal as the
Documentation Agent hereunder and under the other Loan Papers, the provisions of
this Article VII shall inure to its benefit as to any actions taken or omitted
to be taken by it while it was the Documentation Agent under this Agreement and
the other Loan Papers.

         Section 7.9         Notice of Default.  The Administrative Agent shall
not be deemed to have knowledge or notice of the occurrence of any Default or
Event of Default hereunder unless the Administrative Agent shall have received
notice from a Bank or the Company referring to this Agreement, describing such
Default or Event of Default and stating that such notice is a "notice of
default."  If the Administrative Agent receives such a notice, the
Administrative Agent shall give notice thereof to the Banks and the Auction
Administration Agent; provided, however, if such notice is received from a
Bank, the Administrative Agent also shall give notice thereof to the Company.
The Administrative Agent shall be entitled to take action or refrain from
taking action with respect to such Default or Event of Default as provided in
Section 7.1 and Section 7.2.



                                     -70-
<PAGE>   76
                                  ARTICLE VIII

                                 MISCELLANEOUS

         Section 8.1         Amendments, Etc.  No amendment or waiver of any
provision of this Agreement or any other Loan Paper, nor consent to any
departure by the Company herefrom or therefrom, shall in any event be effective
unless the same shall be in writing and signed by the Majority Committed Banks,
or after termination of the Commitments, the Majority Banks (or the
Administrative Agent with the consent of the Majority Committed Banks, or after
termination of the Commitments, the Majority Banks) in all cases, and then, in
any case, such waiver or consent shall be effective only in the specific
instance and for the specific purpose for which given; provided, however, that
no amendment, waiver, or consent shall, unless in writing and signed by all the
Banks (or the Administrative Agent with the consent of all the Banks), do any
of the following:  (a) waive any of the conditions specified in Section 3.1,
3.2, or 3.3 (if and to the extent that the Borrowing which is the subject of
such waiver would involve an increase in the aggregate outstanding amount of
Loans over the aggregate amount of Loans outstanding immediately prior to such
Borrowing), (b) reduce or increase the amount or alter the terms of the
Commitments of any Banks or subject any Banks to any additional obligations,
(c) reduce the principal of, or rate or amount of interest applicable to, any
Loan other than as provided in this Agreement, or any fees hereunder, (d)
postpone any date fixed for any payment of principal of, or interest on, the
Loans or any fees hereunder, (e) change this Section 8.1, or (f) change the
percentage of the Commitments or of the aggregate unpaid principal amount of
the Loans, or the number of Banks, which shall be required for the Banks or any
of them to take any action hereunder; and provided, further, that no amendment,
waiver, or consent shall, unless in writing and signed by the Administrative
Agent in addition to the Banks required above to take such action, affect the
rights or duties of the Administrative Agent under this Agreement or any other
Loan Paper; and provided, further, that no amendment, waiver, or consent shall,
unless in writing and signed by the Auction Administration Agent in addition to
the Banks required to take such action, affect the rights or duties of the
Auction Administration Agent pursuant to this Agreement or any other Loan
Paper; and provided, further, that no amendment, waiver, or consent shall,
unless in writing and signed by the Documentation Agent in addition to the
Banks required to take such action, affect the rights or duties of the
Documentation Agent pursuant to this Agreement or any other Loan Paper.





                                      -71-
<PAGE>   77
         Section 8.2         Notices, Etc.  Any Agent, any Bank, or the holder
of any Loan or Note giving consent or notice or making any request of the
Company provided for hereunder, shall notify each Bank, the Administrative
Agent, and the Auction Administration Agent thereof.  In the event that the
holder of any Loan or Note (including any Bank) shall transfer such Loan or
Note, it shall promptly so advise the Administrative Agent and the Auction
Administration Agent which shall be entitled to assume conclusively that no
transfer of any Loan or Note has been made by any holder (including any Bank)
unless and until such Agent receives written notice to the contrary.  Notices,
consents, requests, approvals, demands, and other communications (collectively
"Communications") provided for herein shall be in writing (including telecopy
Communications) and mailed, telecopied or delivered:

                 (a)         If to the Company, to it at:
                             P.O. Box 36611
                             Love Field
                             Dallas, Texas  75235
                             Telecopy Number:      (214) 792-4022
                             Attention:  John D. Owen, Treasurer

                 (b)         If to the Administrative Agent, to it at:
                             2200 Ross Avenue, 3rd Floor
                             Dallas, Texas 75201
                             Telecopy Number:      (214) 922-2990
                             Attention:  Dallas Corporate Department

                 (c)         If to the Auction Administration Agent, to it at:
                             One Chase Manhattan Plaza, 8th Floor
                             New York, New York  10081
                             Telecopy Number:      (212) 552-5627
                             Attention:   Chris Consomer
                                          Loan and Agency Services Group

                 (d)         If to any Bank or any other Agent, as specified on
         Schedule I hereto or, in the case of any party, such other address or
         telecopy number as such party may hereafter specify for such purpose
         by notice to the other parties.  All Communications shall, when
         mailed, telecopied or delivered, be effective and shall be deemed to
         have been duly given when 





                                      -72-
<PAGE>   78

         sent by telecopier to any party or the telecopier number as set forth
         herein or on the signature pages hereof (or other telecopy number
         designated by such party in a written notice to the other parties
         hereto), or five days after being mailed to the address as set forth
         herein (or such other address designated by such party in a written
         notice to the other parties hereto) respectively, or when delivered to
         such address; provided, however, Communications to any Agent pursuant
         to Article II or Article VII shall not be effective until received by
         such Agent.

         Section 8.3         No Waiver; Remedies.  No failure on the part of
any Bank or any Agent to exercise, and no delay in exercising, any Right
hereunder or under any other Loan Paper shall operate as a waiver thereof; nor
shall any single or partial exercise of any such Right, or any abandonment or
discontinuance of any steps to enforce such Right, preclude any other or
further exercise thereof or the exercise of any other Right.  No notice to or
demand on the Company in any case shall entitle the Company to any other or
further notice or demand in similar or other circumstances.  The Rights herein
provided are cumulative and not exclusive of any Rights provided by Law.

         Section 8.4         Costs, Expenses and Taxes.  The Company agrees to
pay or reimburse the Agents for paying: (i) all reasonable costs and expenses
of the Agents in connection with (A) the preparation, execution, delivery, and
administration of this Agreement and the other Loan Papers, including, without
limitation, the reasonable fees and out-of-pocket expenses of counsel for the
Agents with respect thereto and with respect to advising the Agents as to their
respective Rights and responsibilities under this Agreement and the other Loan
Papers, and (B) any amendment, modification, supplement, or waiver of any of
the terms of this Agreement, and (ii) all reasonable costs and expenses of the
Banks and the Agents (including reasonable counsel's fees, and including
reasonable allocated in-house counsel fees for any Bank or any Agent) in
connection with the enforcement of this Agreement and the other Loan Papers.
In addition, the Company shall pay any and all Taxes payable or determined to
be payable in connection with the execution and delivery of this Agreement and
the other Loan Papers, and agrees to save the Agents and each Bank harmless
from and against any and all liabilities with respect to or resulting from any
delay in paying or omitting to pay such Taxes, if any, which may be payable or
determined to be payable in connection with the





                                      -73-
<PAGE>   79
execution and delivery of this Agreement or any other Loan Paper.  The
obligations of the Company under this Section 8.4 shall survive the termination
of this Agreement and/or repayment of the Loans.

         SECTION 8.5         INDEMNITY.  THE COMPANY AGREES TO INDEMNIFY AND
HOLD HARMLESS THE AGENTS AND THE BANKS AND EACH OF THEIR RESPECTIVE AFFILIATES,
OFFICERS, DIRECTORS, EMPLOYEES, AGENTS, ADVISORS AND REPRESENTATIVES AGAINST
ANY AND ALL LIABILITIES, OBLIGATIONS, LOSSES, DAMAGES, PENALTIES, ACTIONS,
JUDGMENTS, SUITS, CLAIMS, COSTS, DEFICIENCIES, EXPENSES, AND DISBURSEMENTS OF
ANY KIND OR NATURE WHATSOEVER WHICH MAY BE IMPOSED ON, INCURRED BY OR ASSERTED
AGAINST ANY AGENT, ANY BANK, OR ANY OF THEIR RESPECTIVE AFFILIATES, OFFICERS,
DIRECTORS, EMPLOYEES, AGENTS, ADVISORS OR OTHER REPRESENTATIVES IN ANY WAY
RELATING TO OR ARISING OUT OF THE LOAN PAPERS, ANY TRANSACTION RELATED HERETO,
OR ANY ACT, OMISSION, OR TRANSACTION OF THE COMPANY, ITS SUBSIDIARIES, AND
AFFILIATES, OR ANY OF THEIR EMPLOYEES, OFFICERS, DIRECTORS OR OTHER
REPRESENTATIVES, TO THE EXTENT THAT ANY OF THE SAME RESULTS, DIRECTLY OR
INDIRECTLY, FROM ANY CLAIMS MADE OR ACTIONS, SUITS, OR PROCEEDINGS COMMENCED BY
OR ON BEHALF OF ANY PERSON OTHER THAN AN AGENT OR A BANK.  THE OBLIGATION OF
THE COMPANY UNDER THIS SECTION SHALL CONTINUE FOR A PERIOD OF ONE YEAR AFTER
PAYMENT OF THE OBLIGATION AND TERMINATION OF ANY OR ALL LOAN PAPERS, AND SHALL
NOT BE RELIEVED BY ANY CLAIM OR ALLEGATION OF NEGLIGENCE BY ANY AGENT OR ANY
BANK; PROVIDED, HOWEVER, THAT ALTHOUGH EACH INDEMNIFIED PARTY SHALL HAVE THE
RIGHT TO BE INDEMNIFIED FROM ITS OWN ORDINARY NEGLIGENCE, NO INDEMNIFIED PARTY
SHALL HAVE THE RIGHT TO BE INDEMNIFIED HEREUNDER FOR ITS OWN FRAUD, GROSS
NEGLIGENCE, OR WILLFUL MISCONDUCT.

         Section 8.6         Right of Setoff.  If any Event of Default shall
have occurred and be continuing, each Bank is hereby authorized at any time
from time to time, to the fullest extent permitted by Law, to set off and apply
any and all deposits (general or special, time or demand, provisional or final)
at any time held and other indebtedness at any time owing by such Bank to or
for the credit or the account of the Company against any and all obligations of
the Company now or hereafter existing under this Agreement and the Loans held
by such Bank, irrespective of whether or not such Bank shall have made any
demand under this Agreement or any Note and although such obligations may be
unmatured.  Each Bank agrees promptly to notify the Company and the
Administrative Agent after any such setoff and application made by such Bank,
but the failure to give such notice shall not affect the validity of such
setoff





                                      -74-
<PAGE>   80
and application.  The Rights of each Bank under this Section 8.6 are in
addition to the Rights and remedies (including, without limitation, other
Rights of setoff) which such Bank may have.

         SECTION 8.7         GOVERNING LAW; VENUE; SERVICE OF process.

                 (a)         THIS AGREEMENT AND ALL OTHER LOAN PAPERS SHALL BE
         DEEMED TO BE CONTRACTS AND AGREEMENTS EXECUTED BY THE COMPANY, THE
         AGENTS, AND THE BANKS UNDER THE LAWS OF THE STATE OF TEXAS AND OF THE
         UNITED STATES AND FOR ALL PURPOSES SHALL BE CONSTRUED IN ACCORDANCE
         WITH, AND GOVERNED BY, THE LAWS OF SAID STATE AND OF THE UNITED
         STATES.  Without limitation of the foregoing, nothing in this
         Agreement or in any Note shall be deemed to constitute a waiver of any
         Rights which any Bank may have under applicable federal legislation
         relating to the amount of interest which such Bank may contract for,
         take, receive, or charge in respect of any Loans, including any Right
         to take, receive, reserve, and charge interest at the rate allowed by
         the Law of the states where such Bank is located.  The provisions of
         Chapter 15 of Article 5069 of the Texas Revised Civil Statutes do not
         apply to this Agreement or any Note issued hereunder.

                 (b)         TO THE EXTENT PERMITTED BY APPLICABLE LAW, ANY
         ACTION OR PROCEEDING AGAINST THE COMPANY UNDER OR IN CONNECTION WITH
         ANY OF THE LOAN PAPERS MAY BE BROUGHT IN ANY STATE OR FEDERAL COURT IN
         DALLAS COUNTY, TEXAS.  TO THE EXTENT PERMITTED BY APPLICABLE LAW, THE
         COMPANY HEREBY IRREVOCABLY (A) SUBMITS TO THE NONEXCLUSIVE
         JURISDICTION OF SUCH COURTS, AND (B) WAIVES ANY OBJECTION IT MAY NOW
         OR HEREAFTER HAVE AS TO THE VENUE OF ANY SUCH ACTION OR PROCEEDING
         BROUGHT IN ANY SUCH COURT OR THAT ANY SUCH COURT IS AN INCONVENIENT
         FORUM.  THE COMPANY AGREES THAT SERVICE OF PROCESS UPON IT MAY BE MADE
         BY CERTIFIED OR REGISTERED MAIL, RETURN RECEIPT REQUESTED, AT ITS
         ADDRESS SPECIFIED OR DETERMINED IN ACCORDANCE WITH THE PROVISIONS OF
         SECTION 8.2.  NOTHING HEREIN OR IN ANY OF THE OTHER LOAN PAPERS SHALL
         AFFECT THE RIGHT OF ANY AGENT OR ANY BANK TO SERVE PROCESS IN ANY
         OTHER MANNER PERMITTED BY LAW OR SHALL LIMIT THE RIGHT OF ANY AGENT OR
         ANY BANK TO BRING ANY ACTION OR PROCEEDING AGAINST THE COMPANY OR WITH
         RESPECT TO ANY OF ITS PROPERTY IN COURTS IN OTHER JURISDICTIONS.  ANY
         ACTION OR PROCEEDING BY THE COMPANY AGAINST ANY AGENT OR ANY BANK
         SHALL BE BROUGHT ONLY IN A COURT LOCATED IN DALLAS COUNTY, TEXAS.





                                      -75-
<PAGE>   81
         Section 8.8         Usury Not Intended.  The Company and the Banks
intend to strictly comply with all applicable Laws, including Applicable Laws.
Accordingly, the provisions of this Section 8.8 shall govern and control over
every other provision of this Agreement and any Note, whenever executed, which
conflicts with this Section 8.8, even if such provision declares that it
controls (unless such provision expressly identifies and refers to this Section
8.8 and specifically states that it will control over this Section 8.8).  As
used in this Section 8.8, the term "interest" includes the aggregate of all
charges which constitute interest under Applicable Laws, provided that, to the
maximum extent permitted by Applicable Laws, (a) any non-principal payment
shall be characterized as an expense or fee or something other than
compensation for the use, forbearance, or detention of money and not as
interest, and (b) all interest at any time contracted for, reserved, charged,
or received shall be amortized, prorated, allocated, and spread, in equal or
unequal parts throughout the entire contemplated term of the Borrowings so that
interest for the entire term does not exceed the maximum rate permitted by
Applicable Laws.  In no event shall the Company or any other Person be
obligated to pay, or any Bank have any right or privilege to contract for,
reserve, receive, retain, or charge (a) any interest in excess of the maximum
amount of nonusurious interest permitted under Applicable Laws, or (b) total
interest in excess of the amount which such Bank could lawfully have contracted
for, reserved, received, retained, or charged had the interest been calculated
for the full term of the Borrowings at the Highest Lawful Rate.  On each day,
if any, that the interest rate (the "Stated Rate") called for under this
Agreement or under any Note or other related document exceeds the Highest
Lawful Rate, the rate at which interest shall accrue shall automatically be
fixed by operation of this sentence at the Highest Lawful Rate for that day,
and shall remain fixed at the Highest Lawful Rate (or at any time no Highest
Lawful Rate shall exist, at the Agreed Maximum Rate) for each day thereafter
until the total amount of interest accrued equals the total amount of interest
which would have accrued if there were no such ceiling rate as is imposed by
this sentence.  Thereafter, interest shall accrue at the Stated Rate unless and
until the Stated Rate again exceeds the Highest Lawful Rate when the provisions
of the immediately preceding sentence shall again automatically operate to
limit the interest accrual rate.  The daily interest rates to be used in
calculating interest at the Highest Lawful Rate shall be determined by dividing
the applicable Highest Lawful Rate per annum by the number of days in the
calendar





                                      -76-
<PAGE>   82
year for which such calculation is being made.  None of the terms and
provisions contained in this Agreement, any Note, or any other Loan Paper which
directly or indirectly relate to interest shall ever be construed without
reference to this Section 8.8 or construed to create a contract to pay for the
use, forbearance, or detention of money at an interest rate in excess of the
Highest Lawful Rate.  If the term of any Loan is shortened by reason of
acceleration of maturity as a result of any Event of Default or other cause, or
by reason of any required or permitted prepayment, and if for that (or any
other) reason any Bank at any time (including but not limited to the stated
maturity of any Borrowing) is owed or receives (and/or has received) interest
in excess of interest calculated at the Highest Lawful Rate, then and in any
such event all of any such excess interest shall be cancelled automatically as
of the date of such acceleration, prepayment, or other event which produces the
excess, and, if such excess interest has been paid to a Bank, it shall be
credited pro tanto against the then-outstanding principal balance of the
Company's obligations to such Bank, effective as of the date or dates when the
event occurs which causes it to be excess interest, until such excess is
exhausted or all of such principal has been fully paid and satisfied, whichever
occurs first, and any remaining balance of such excess shall be promptly
refunded to its payor.

         Section 8.9         Survival of Representations and Warranties.  All
representations and warranties contained herein or made in writing by the
Company in connection herewith shall survive the execution and delivery of this
Agreement and the other Loan Papers, and no investigation by any Agent or any
Bank or any closing shall affect the representations and warranties or the
Right of any Agent or any Bank to rely upon them.

         Section 8.10        Binding Effect.  This Agreement shall become
effective when it shall have been executed by the Company, the Agents, and each
Bank and thereafter shall be binding upon and inure to the benefit of the
Company (subject to the provisions of Section 8.11), the Agents, each Bank and
their respective successors and assigns.

         Section 8.11        Successors and Assigns; Participations.

                 (a)         Whenever in this Agreement any of the parties
         hereto is referred to, such reference shall be deemed to include the
         successors and permitted assigns of such party; and all





                                      -77-
<PAGE>   83
         covenants, promises, agreements, representations and warranties by or
         on behalf of the Company, the Agents or the Banks that are contained
         in this Agreement shall bind and inure to the benefit of their
         respective successors and assigns.  The Company may not assign or
         transfer any its rights or obligations hereunder without the prior
         written consent of all of the Banks.

                 (b)         Each Bank may without the consent of the Company
         sell participations to one or more banks or other entities in all or a
         portion of its rights and obligations under this Agreement (including,
         without limitation, all or a portion of its Commitment and the Loans
         owing to it and any Note or Notes held by it); provided, however, that
         (i) such Bank's obligations under this Agreement shall remain
         unchanged, (ii) such Bank shall remain solely responsible to the other
         parties hereto for the performance of such obligations, (iii) such
         Bank shall remain the holder of its Loans and Notes (if any) for all
         purposes of this Agreement, (iv) the participating banks or other
         entities shall be entitled to the cost protection provisions contained
         in Article IIand Section 8.4, but only to the extent that such
         protection would have been available to such Bank, calculated as if no
         such participations had been sold, and the indemnity protection
         provisions contained in Section 8.5, (v) the Company, the Agents, and
         the other Banks shall continue to deal solely and directly with such
         Bank in connection with such Bank's rights and obligations under this
         Agreement, and (vi) such Bank shall not sell a participation that
         conveys to the participant the right to vote or give or withhold
         consents under this Agreement or any other Loan Papers, other than the
         right to vote upon or consent to (y) amendments, modifications, or
         waivers with respect to any fees payable hereunder (including the
         dates fixed for the payment of any such fees) or the amount of
         principal or the rate of interest payable on, or the dates fixed for
         any payment of principal of or interest on, the Loans and (z) any
         extension of the Termination Date.

                 (c)         Each Bank may assign, with the prior written
         consent of the Company (which consent shall not be unreasonably
         withheld and shall not be required after the occurrence or during the
         continuance of a Default or Event of Default) and the Administrative
         Agent, to one or more Eligible Assignees, all or a portion of its
         interests, rights, and obligations





                                      -78-
<PAGE>   84
         under this Agreement (including, without limitation, all or a portion
         of its Commitment and the same portion of the Committed Loans at the
         time owing to it; provided, however, that (i) each Bank's Commitment
         (including Loans owing to it) shall not be less than $10,000,000,
         minus reductions pursuant to Section 2.6(a), (ii) each such assignment
         shall be of a constant, and not a varying, percentage of all the
         assigning Bank's rights and obligations under this Agreement (other
         than any Competitive Loans, any Competitive Notes and any right to
         make Competitive Loans), (iii) the assignee thereof shall deliver to
         the Company and the Administrative Agent any Internal Revenue Service
         forms required by Section 2.19, and (iv) the parties to each such
         assignment shall execute and deliver to the Administrative Agent, for
         its acceptance and recording in the Register (as defined below), an
         Assignment and Acceptance substantially in the form of Exhibit H
         hereto (an "Assignment and Acceptance"), together with a properly
         completed Administration Questionnaire, any Note or Notes subject to
         such assignment and a processing and recordation fee of $2,000 (or
         such lesser amount as shall be acceptable to the Administrative
         Agent); provided, however, no such fee shall be required in the case
         of any assignment requested by the Company pursuant to Article II of
         this Agreement.  Upon such execution, delivery, acceptance, and
         recording, from and after the effective date specified in each
         Assignment and Acceptance, which effective date shall be at least five
         Business Days after the execution thereof (unless a shorter period
         shall be agreed to by the Company, the Administrative Agent, and the
         assignor Bank), (x) the Eligible Assignee thereunder shall be a party
         hereto and, to the extent provided in such Assignment and Acceptance,
         have the rights and obligations of a Bank hereunder and under the
         other Loan Papers and (y) the assignor Bank thereunder shall, to the
         extent provided in such Assignment and Acceptance, be released from
         its obligations under this Agreement and the other Loan Papers (and,
         in the case of an Assignment and Acceptance covering all of the
         remaining portion of an assigning Bank's rights and obligations under
         this Agreement and the other Loan Papers, such Bank shall cease to be
         a party hereto and thereto).

                 (d)         By executing and delivering an Assignment and
         Acceptance, the Bank assignor thereunder and the Eligible Assignee
         confirm to and agree with each other and the other





                                      -79-
<PAGE>   85
         parties hereto as follows:  (i) other than the representation and
         warranty that it is a legal and beneficial owner of the interest being
         assigned thereby free and clear of any adverse claim, such Bank
         assignor makes no representation or warranty and assumes no
         responsibility with respect to any statements, warranties, or
         representations made in or in connection with this Agreement or any
         other Loan Paper or the execution, legality, validity, enforceability,
         genuineness, sufficiency, or value of this Agreement, any other Loan
         Paper or any other instrument or document furnished pursuant hereto;
         (ii) such Bank assignor makes no representation or warranty and
         assumes no responsibility with respect to the financial condition of
         the Company or the performance or observance of its respective
         obligations under this Agreement, any other Loan Paper or any other
         instrument or document furnished pursuant hereto or thereto; (iii)
         such Eligible Assignee confirms that it has received a copy of this
         Agreement together with copies of financial information and such other
         documents and information as it has deemed appropriate to make its own
         credit analysis and decision to enter into such Assignment and
         Acceptance; (iv) such Eligible Assignee will, independently and
         without reliance upon the Agents, such Bank assignor, or any other
         Bank and based on such documents and information as it shall deem
         appropriate at the time, continue to make its own credit decisions in
         taking or not taking action under this Agreement; (v) such Eligible
         Assignee appoints and authorizes the Administrative Agent, the Auction
         Administration Agent and the Documentation Agent to take such action
         on behalf of such Eligible Assignee and to exercise such powers under
         this Agreement and the other Loan Papers as are delegated to each such
         Agent by the terms hereof and thereof, together with such powers as
         are reasonably incidental thereto; (vi) such Eligible Assignee agrees
         that it will perform in accordance with their terms all of the
         obligations which by the terms of this Agreement are required to be
         performed by it as a Bank; and (vii) such Eligible Assignee confirms
         that it is an Eligible Assignee as defined above.

                 (e)         The Administrative Agent shall maintain at its
         office a copy of each Assignment and Acceptance delivered to it and a
         register for the recordation of the names and addresses of the Banks
         and the Commitment of, and principal amount of the Loan owing to, each
         Bank from time to time (the "Register").  The entries in the Register
         shall be conclusive,





                                      -80-
<PAGE>   86
         in the absence of manifest error, and the Company, the Agents, and the
         Banks may treat each Person whose name is recorded in the Register as
         a Bank hereunder for all purposes of this Agreement.  The Register
         shall be available for inspection by the Company, any Bank, the
         Administrative Agent, or the Auction Administration Agent at any
         reasonable time and from time to time upon reasonable prior notice.

                 (f)         Upon its receipt of an Assignment and Acceptance
         executed by an assigning Bank and an Eligible Assignee together with
         any Note or Notes subject to such assignment and the written consent
         to such assignment, the Administrative Agent shall, if such Assignment
         and Acceptance has been completed and is substantially in the form of
         Exhibit H hereto, (i) accept such Assignment and Acceptance, (ii)
         record the information contained therein in the Register, and (iii)
         give prompt notice thereof to the Banks, the Administrative Agent, the
         Auction Administration Agent, and the Company.  Within five Business
         Days after receipt of such notice, the Company, at its own expense,
         shall execute and deliver to the Administrative Agent in exchange for
         the surrendered Note or Notes, if any, (x) a new Committed Note or
         Committed Notes to the order of such Eligible Assignee in an amount
         equal to its portion of the Commitment assumed by it pursuant to such
         Assignment and Acceptance, (y) if the assigning Bank has retained its
         Competitive Note, a new Competitive Note to the order of the Eligible
         Assignee, and (z) if the assigning Bank has retained any Commitment
         hereunder, new Committed Notes to the order of the assigning Bank in
         an amount equal to the Commitment retained by it hereunder.  Such new
         Committed Notes shall be in an aggregate principal amount equal to the
         aggregate principal amount of such surrendered Committed Notes.  Such
         new Committed Notes and Competitive Notes shall be dated the effective
         date of such Assignment and Acceptance and shall otherwise be in
         substantially the form of Exhibit D-1 or D-2 as applicable, hereto.
         Cancelled Notes shall be returned to the Company.

                 (g)         Notwithstanding any other provision herein, any
         Bank may, in connection with any assignment or participation or
         proposed assignment or participation pursuant to this Section 8.11,
         disclose to the assignee or participant or proposed assignee or
         participant any information relating to the Company and its
         Subsidiaries furnished to such Bank by or





                                      -81-
<PAGE>   87
         on behalf of the Company; provided, that prior to any such disclosure,
         each such assignee or participant or proposed assignee or participant
         shall agree for the benefit of the Company to preserve the
         confidentiality of any confidential information relating to the
         Company received from such Bank.

                 (h)         Notwithstanding any other provision set forth in
         this Agreement, any Bank may at any time create a security interest in
         all or any portion of its Rights under this Agreement (including,
         without limitation, the Loans owing to it and any Notes held by it) in
         favor of any Federal Reserve Bank in accordance with Regulation A of
         the Board.

         Section 8.12         Independence of Covenants.  All covenants
contained in this Agreement shall be given independent effect so that if a
particular action or condition is not permitted by any such covenants, the fact
that such action or condition would be permitted by an exception to, or
otherwise be within the limitations of, another covenant shall not avoid the
occurrence of a Default or Event of Default if such action is taken or
condition exists.
 
         Section 8.13        Severability.  Should any clause, sentence,
paragraph, or Section of this Agreement be judicially declared to be invalid,
unenforceable, or void, such decision will not have the effect of invalidating
or voiding the remainder of this Agreement, and the parties hereto agree that
the part or parts of this Agreement so held to be invalid, unenforceable, or
void will be deemed to have been stricken herefrom and the remainder will have
the same force and effectiveness as if such part or parts had never been
included herein.

         Section 8.14        Entire Agreement.     THIS AGREEMENT, THE FEE
LETTERS BETWEEN THE COMPANY AND THE RESPECTIVE AGENTS, AND THE OTHER LOAN
PAPERS REPRESENT THE FINAL AGREEMENT BETWEEN THE PARTIES HERETO AND SUPERSEDE
ANY AND ALL PRIOR COMMITMENTS, AGREEMENTS, REPRESENTATIONS, AND UNDERSTANDINGS,
WHETHER WRITTEN OR ORAL, RELATING TO THE SUBJECT MATTER HEREOF, AND MAY NOT BE
CONTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL
AGREEMENTS OF THE PARTIES.  THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE
PARTIES.  Without in any way limiting the foregoing, this Agreement supersedes
that certain Competitive Advance and Revolving Credit Facility Agreement dated
as of December 14, 1990, as amended, among the Company and the Banks and Agents
named therein, and the commitments of such Banks thereunder are hereby
terminated.





                                      -82-
<PAGE>   88
         Section 8.15        Descriptive Headings.  The section headings
appearing in this Agreement have been inserted for convenience only and shall
be given no substantive meaning or significance whatever in construing the
terms and provisions of this Agreement.

         Section 8.16        Execution in Counterparts.  This Agreement may be
executed in any number of counterparts and by different parties hereto in
separate counterparts, each of which when so executed shall be deemed to be an
original and all of which taken together shall constitute one and the same
agreement.





                                      -83-
<PAGE>   89
         Section 8.17        WAIVER OF JURY TRIAL.  TO THE FULLEST EXTENT
PERMITTED BY APPLICABLE LAW, EACH OF THE COMPANY, THE AGENTS AND THE BANKS
HEREBY IRREVOCABLY AND EXPRESSLY WAIVES ALL RIGHT TO A TRIAL BY JURY IN ANY
ACTION, PROCEEDING OR COUNTERCLAIM (WHETHER BASED UPON CONTRACT, TORT OR
OTHERWISE) ARISING OUT OF OR RELATING TO ANY OF THE LOAN PAPERS OR THE
TRANSACTIONS CONTEMPLATED THEREBY OR THE ACTIONS OF ANY AGENT OR ANY BANK IN
THE NEGOTIATION, ADMINISTRATION, PERFORMANCE OR ENFORCEMENT THEREOF.

         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be executed by their respective officers thereunto duly authorized, as of the
date first above written.

                                  SOUTHWEST AIRLINES CO.
                                  
                                  By: /s/ John D. Owen
                                     ------------------------------------------
                                          Name:  John D. Owen   
                                               --------------------------------
                                          Title: Treasurer     
                                                -------------------------------
                                  
                                  
$80,000,000                       TEXAS COMMERCE BANK NATIONAL ASSOCIATION, as
                                  a Bank and as Administrative Agent
                                  
                                  
                                  By: /s/ Mark J. Denton 
                                     ------------------------------------------
                                          Name: Mark J. Denton
                                               --------------------------------
                                          Title: Senior Vice President 
                                                -------------------------------
                                  
                                  
                                  THE CHASE MANHATTAN BANK,
                                  as Auction Administration Agent
                                  
                                  
                                  By: /s/ Lawrence Palumbo
                                     ------------------------------------------
                                          Name: Lawrence Palumbo
                                               --------------------------------
                                          Title: Vice President  
                                                -------------------------------





                                      -84-
<PAGE>   90
$80,000,000                       BANK OF AMERICA NATIONAL TRUST AND
                                  SAVINGS ASSOCIATION, as a Bank and
                                  as Documentation Agent
                                  
                                  
                                  By: /s/ Lori Y. Kannegieter
                                     ------------------------------------------
                                          Name: Lori Y. Kannegieter
                                               --------------------------------
                                          Title: Managing Director
                                                -------------------------------
                                  
$80,000,000                       NATIONSBANK OF TEXAS, N.A.,
                                  as a Bank and as Syndication Agent
                                  
                                  
                                  By: /s/ Jeff Susman    
                                     ------------------------------------------
                                          Name: Jeff Susman          
                                               --------------------------------
                                          Title: Senior Vice President    
                                                -------------------------------
                                  
$50,000,000                       ABN AMRO BANK N.V.
                                  
                                  
                                  By: /s/ Robert L. Decker                
                                     ------------------------------------------
                                          Name: Robert L. Decker          
                                               --------------------------------
                                          Title: Vice President       
                                                -------------------------------
                                  
                                  By: /s/ Lukas van der Hoel          
                                     ------------------------------------------
                                          Name: Lukas van der Hoel     
                                               --------------------------------
                                          Title: Vice President       
                                                -------------------------------
                                  
$50,000,000                       ROYAL BANK OF CANADA
                                  
                                  
                                  By: /s/ D.G. Calancie            
                                     ------------------------------------------
                                          Name: D.G. Calancie       
                                               --------------------------------
                                          Title: Industry Manager    
                                                -------------------------------
                                  
$40,000,000                       THE MITSUBISHI TRUST AND BANKING
                                  CORPORATION, NEW YORK BRANCH
                                  
                                  
                                  By: /s/ Scott J. Paige                
                                     ------------------------------------------
                                          Name: Scott J. Paige        
                                               --------------------------------
                                          Title: Senior Vice President 
                                                -------------------------------





                                      -85-
<PAGE>   91
$40,000,000                       BANK ONE, TEXAS, N.A.
                                  
                                  
                                  By: /s/ Gina Norris
                                     ------------------------------------------
                                          Name: Gina Norris     
                                               --------------------------------
                                          Title: Vice President
                                                -------------------------------
                                  
$30,000,000                       FIRST SECURITY BANK, N.A.
                                  
                                  
                                  By: /s/ Steven M. Kohler     
                                     ------------------------------------------
                                          Name: Steven M. Kohler 
                                               --------------------------------
                                          Title: Vice President    
                                                -------------------------------
                                  
$25,000,000                       WACHOVIA BANK OF GEORGIA, N.A.
                                  
                                  
                                  By: /s/ Joel K. Wood             
                                     ------------------------------------------
                                          Name: Joel K. Wood            
                                               --------------------------------
                                          Title: Vice President      
                                                -------------------------------





                                      -86-
<PAGE>   92
                                   SCHEDULE I
                             SOUTHWEST AIRLINES CO.
                            Competitive Advance and
                           Revolving Credit Agreement



<TABLE>
<CAPTION>
===========================================================================================================================
                                                                                   NOTICE
           NAME                          LENDING OFFICE***                      INFORMATION
- ---------------------------------------------------------------------------------------------------------------------------
  <S>                                 <C>                                 <C>
  TEXAS COMMERCE                      Texas Commerce Bank                 Texas Commerce Bank
  BANK NATIONAL                       National Association                National Association
  ASSOCIATION                         712 Main  Street                    2200 Ross Avenue, 3rd Floor
                                      Houston, TX  77002                  Dallas, TX  75201
                                      Telecopy (713) 546-2339             Telecopy (214) 965-2044
                                      Attn.:  Gale Manning                Telephone (214) 965-2246
                                                                          Attn.:  Mark Denton
- ---------------------------------------------------------------------------------------------------------------------------
  BANK OF AMERICA                     Bank of  America National           Bank of  America National
  NATIONAL TRUST AND SAVINGS            Trust and Savings Association       Trust and Savings Association
  ASSOCIATION                         North American Division             North American Division
                                      Airlines Group 5770                 Airlines Group 5770
                                      555 South Flower Street             555 South Flower Street
                                      Los Angeles, CA  90071              Unit 5413, 11th Floor
                                                                          Los Angeles, CA  90071
                                                                          Telecopy (213) 228-2756
                                                                          Telephone (213) 228-3443
                                                                          Attn.:  Patrick P. Horan
- ---------------------------------------------------------------------------------------------------------------------------
  NATIONSBANK OF TEXAS, N.A.          NationsBank of Texas, N.A.          NationsBank of Texas, N.A.
                                      901 Main Street                     901 Main Street, 67th Floor
                                      Dallas, TX  75202                   Dallas, TX  75202
                                                                          Telecopy (214) 508-0980
                                                                          Telephone (214) 508-0964
                                                                          Attn.:  Jeff Susman
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>





                                      -87-
<PAGE>   93
<TABLE>
  <S>                                 <C>                                 <C>
- ---------------------------------------------------------------------------------------------------------------------------
  ABN AMRO BANK N.V.                  ABN AMRO Bank N.V.                  ABN AMRO Bank N.V.
                                      135 S. LaSalle Street               135 S. LaSalle Street
                                      Suite 760                           Suite 760
                                      Chicago, IL  60674-9135             Chicago, IL  60674-9135
                                                                          Telecopy (312) 606-8428
                                                                          Telephone (312) 904-2836
                                                                          Attn.:  Lukas van der Hoef
- ---------------------------------------------------------------------------------------------------------------------------
  ROYAL BANK OF CANADA                Royal Bank of Canada                Royal Bank of Canada
                                      Grand Cayman (North America No. 1)  Grand Cayman (North America No. 1)
                                      Branch                              Branch
                                      c/o new York Branch                 c/o New York Branch
                                      Financial Square, 23rd Floor        Financial Square, 23rd Floor
                                      32 Old Slip                         32 Old Slip
                                      New York, NY  10005-3531            New York, NY  10005-3531
                                                                          Telecopy:  (212) 428-2372
                                                                          Telephone:  (212) 428-6204
                                                                          Attention:  Manager, Credit
                                                                          Administration

                                                                          Royal Bank of Canada
                                                                          Financial Square, 24th Floor
                                                                          New York, NY  10005-3531
                                                                          Telecopy (212) 428-6459
                                                                          Telephone (212) 428-6445
                                                                          Attn.:  Don Calancie
- ---------------------------------------------------------------------------------------------------------------------------
  THE MITSUBISHI TRUST AND BANKING    The Mitsubishi Trust and Banking    The Mitsubishi Trust and Banking
  CORPORATION, NEW YORK BRANCH        Corporation, New York Branch        Corporation, New York Branch
                                      520 Madison Avenue                  520 Madison Avenue
                                      New York, NY  10022                 New York, NY  10022
                                                                          Telecopy (212) 644-6825
                                                                          Telephone (212) 891-8216
                                                                          Attn.:  Scott J. Paige
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>





                                      -88-
<PAGE>   94
<TABLE>
  <S>                                 <C>                                 <C>
- ---------------------------------------------------------------------------------------------------------------------------
  BANK ONE, TEXAS, N.A.               Bank One, Texas, N.A.               Bank One, Texas, N.A.
                                      1717 Main Street                    1717 Main Street
                                      Dallas, TX  75201                   Dallas, TX  75201
                                      Telecopy (214) 290-2765             Telecopy (214) 290-2765
                                      Attn.:  Michael Silverman           Telephone (214) 290-2713
                                                                          Attn.:  Gina Norris
- ---------------------------------------------------------------------------------------------------------------------------
  FIRST SECURITY BANK, N.A.           First Security Bank, N.A.           First Security Bank, N.A.
                                      15 East 100 South                   15 East 100 South
                                      2nd Floor                           2nd Floor
                                      Salt Lake City, UT  84111           Salt Lake City, UT  84111
                                                                          Telecopy (801) 246-5532
                                                                          Telephone (801) 246-5228
                                                                          Attn.:  Steven M. Kohler
- ---------------------------------------------------------------------------------------------------------------------------
  WACHOVIA BANK OF GEORGIA, N.A.      Wachovia Bank of Georgia, N.A.      Wachovia Bank of Georgia, N.A.
                                      191 Peachtree St., N.E. MC-GA370    191 Peachtree St., N.E. MC-GA370
                                      Atlanta, GA  30303                  Atlanta, GA  30303
                                                                          Telecopy (404) 332-1159
                                                                          Telephone (404) 332-6898
                                                                          Attn.:  Joel K. Wood
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>





                                      -89-
<PAGE>   95
                                  SCHEDULE II
                             SOUTHWEST AIRLINES CO.
                            Competitive Advance and
                           Revolving Credit Agreement


                    INITIAL SCHEDULE II LISTING POOL ASSETS
                SHALL BE DELIVERED PRIOR TO THE ASSET POOL DATE





                                      -90-

<PAGE>   1





                                                                    Exhibit 10.2

                          Supplemental Agreement No. 2

                                       to

                          Purchase Agreement No. 1810

                                    between

                               The Boeing Company

                                      and

                             SOUTHWEST AIRLINES CO.

                   Relating to Boeing Model 737-7H4 Aircraft

         THIS SUPPLEMENTAL AGREEMENT, entered into as of June 24, 1997, by and
between THE BOEING COMPANY, a Delaware corporation with its principal offices
in Seattle, Washington, (Boeing) and SOUTHWEST AIRLINES CO., a Texas
corporation with its principal offices in City of Dallas, State of Texas
(Buyer);

         WHEREAS, the parties hereto entered into Purchase Agreement No. 1810
dated January 19, 1994, relating to Boeing Model 737-7H4 aircraft (the
Agreement) and;

         WHEREAS, Buyer has agreed to exercise the option to purchase five (5)
additional Option Aircraft delivering in October 1998 (1), November 1998 (2)
and December 1998 (2), (Block "F" Aircraft) offered pursuant to Letter
Agreement 6-1162-RLL-933R1;

         NOW THEREFORE, in consideration of the mutual covenants herein
contained, the parties agree to amend the Agreement as follows:

1.       The Table of Contents of the Agreement is deleted in its entirety and
a new Table of Contents is attached hereto and incorporated into the Agreement
by this reference.  

- ------------------------
***      Pursuant to 17 CFR, 240.246-2, confidential
         information has been omitted and has been filed separately with the
         Securities and Exchange Commission pursuant to a Confidential
         Treatment Application filed with the Commission.






P.A. No. 1810                        SA-2-1
<PAGE>   2

2.       Article 1, entitled "Subject Matter of Sale," paragraph 1.1 entitled
"The Aircraft" is deleted in its entirety and replaced by a new paragraph 1.1
revised to reflect sixty-eight (68) Aircraft. Such new page 1-1 is attached
hereto and incorporated into the Agreement by this reference.

3.       Article 2, entitled "Delivery, Title and Risk of Loss," paragraph 2.1,
entitled "Time of Delivery," is deleted in its entirety and replaced by a new
paragraph 2.1 revised to add five (5) Block "F" Aircraft.  Such new pages 2-1
and 2-2 are attached hereto and incorporated into the Agreement by this
reference.

4.       Article 3, entitled "Price of Aircraft", paragraph 3.2 entitled
"Aircraft Basic Price" is revised by adding a Aircraft Basic Price for the
Block "F" Aircraft. Paragraph 3.3 entitled "Aircraft Price," subparagraph 3.3.1
is revised by adding a Aircraft Basic Price for the Block "F" Aircraft.
Paragraph 3.4 entitled "Advance Payment Base Price," subparagraph 3.4.1
entitled "Advance Payment Base Price" is revised by adding Advance Payment Base
Prices for the Block "F" Aircraft. Such new pages 3-1, 3-2 and 3-3 are attached
hereto and incorporated into the Agreement by this reference.

5.       Letter Agreement No. 6-1162-RLL-933R1 entitled "Option Aircraft" is
deleted in its entirety and replaced with Letter Agreement No. 6-1162-RLL-933R2
attached hereto and incorporated herein by this reference.  The letter
agreement was revised to reflect the exercise of five (5) Block "F" Aircraft
and the conversion of five (5) Block "M" Rolling Option Aircraft to Option
Aircraft. Article 1, entitled "Delivery of Option Aircraft" is revised by
deleting five (5) Option Aircraft from the Block "F" delivery stream and adding
five (5) Block "M" Aircraft in August, 2004 (2) and September, 2004 (3).
Article 2 entitled "Delivery of Rollover Option Aircraft," paragraph 2.1 is
revised to delete five (5) Block "M" Rolling Option Aircraft; paragraph 2.2 and
subparagraphs 2.2.1 and 2.2.2 are revised by changing the quantity of Rolling
Option Aircraft from forty-nine (49) to forty-four (44).  *** Attachment A,
Paragraph 2 entitled "Price Description," subparagraph 2.1 entitled "Price
Elements Per Aircraft" is revised by deleting the October 1998, November 1998
and December 1998 Option Aircraft and adding the August 2004 and September 2004
Option Aircraft, subparagraph 2.2 entitled "Price Adjustments For Option
Aircraft Delivering from October 1998 to October 2001", is revised to be
entitled "Price Adjustment For Option Aircraft Delivering From March 1999 to
October 2001", and subparagraph 2.2.2 is revised to change October 1998 to
March 1999.





P.A. No. 1810                        SA-2-2
<PAGE>   3
6.       Letter Agreement No. 6-1162-RLL-936R1 entitled "Certain Contractual
Matters" is deleted in its entirety and replaced with Letter Agreement No.
6-1162-RLL-936R2 attached hereto and incorporated herein by this reference.
The letter agreement was revised to reflect the exercise of five (5) Block "F"
Aircraft and the conversion of five (5) Block "M" Rolling Option Aircraft to
Option Aircraft.  Article 1 entitled "Credit Memorandum - Aircraft - Firm
Aircraft," is revised to add the credit memorandum amount for the Block "F"
Aircraft.

7.       Letter Agreement No. 6-1162-RLL-1855 entitled "Additional Contractual
Matters," is deleted in its entirety and replaced with Letter Agreement No.
6-1162-RLL-1855R1 attached hereto and incorporated herein by this reference.
The letter agreement was revised to reflect the exercise of five (5) Block "F"
Aircraft.  Article 2 entitled *** for the Option Aircraft delivering from
October 1998 through December 31, 2001," is revised to be entitled *** for the
Option Aircraft Delivering from March 1999 through December 31, 2001.

8.       Concurrent with execution of this Supplemental Agreement, Buyer will
pay to Boeing *** The net amount due Boeing as a result of the exercise of the
Option Aircraft, and the conversion of Rolling Option Aircraft to Option
Aircraft is *** with the difference to be accounted for in the advance payments
due at 12 months prior to delivery of the five (5) exercised Option Aircraft.

9.       All references in the Letter Agreements associated with Purchase
Agreement No. 1810 shall be deemed to refer to the purchase by Buyer of
sixty-eight (68) Model 737-7H4 Aircraft and forty-four (44) Model 737-7H4
Rollover Option Aircraft, to the extent such reference is not specifically
addressed herein.

The Agreement will be deemed to be supplemented to the extent herein provided
and as so supplemented will continue in full force and effect.

EXECUTED IN DUPLICATE as of the day and year first above written.

THE BOEING COMPANY                  SOUTHWEST AIRLINES CO.



By:  /s/ Dawn S. Foster             By:  /s/ Gary A. Barron  
   -------------------------           --------------------------

Its:    Attorney-In-Fact            Its: Executive VP and COO
    ------------------------           --------------------------




P.A. No. 1810                        SA-2-3
<PAGE>   4





                               PURCHASE AGREEMENT

                                     between

                               THE BOEING COMPANY

                                       and

                             SOUTHWEST AIRLINES CO.






                    Relating to Boeing Model 737-7H4 Aircraft

                         Purchase Agreement Number 1810





P.A. No. 1810

<PAGE>   5




                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                          Page           SA
                                                                        Number       Number
                                                                        ------       ------
<S>      <C>                                                             <C>          <C>
ARTICLES
- --------
                                                
1.       Subject Matter of Sale..........................................1-1          SA-2

2.       Delivery, Title and Risk
         of Loss.........................................................2-1          SA-2

3.       Price of Aircraft...............................................3-1          SA-2

4.       Taxes...........................................................4-1

5.       Payment.........................................................5-1

6.       Excusable Delay.................................................6-1

7.       Changes to the Detail
         Specification...................................................7-1          SA-1

8.       Federal Aviation Requirements and
         Certificates and Export License.................................8-1

9.       Representatives, Inspection,
         Flights and Test Data...........................................9-1

10.      Assignment, Resale or Lease....................................10-1

11.      Termination for Certain Events.................................11-1

12.      Product Assurance; Disclaimer and
         Release; Exclusion of Liabilities;
         Customer Support; Indemnification
         and Insurance..................................................12-1

13.      Buyer Furnished Equipment and
         Spare Parts....................................................13-1

14.      Contractual Notices and Requests...............................14-1

15.      Miscellaneous..................................................15-1
</TABLE>





P.A. No. 1810                      i                                      SA-2

<PAGE>   6



                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                SA
                                                            Number
                                                            ------  
<S>     <C>                                                 <C>
EXHIBITS
- --------

A       Aircraft Configuration                              SA-1

B       Product Assurance Document                          SA-1

C       Customer Support Document

D       Price Adjustments Due to
        Economic Fluctuations - Aircraft

E       Buyer Furnished Equipment
        Provisions Document

F       Defined Terms Document




LETTER AGREEMENTS
- -----------------

1810-1                   Waiver of Aircraft Demonstration Flight
</TABLE>





P.A. No. 1810                      ii                                      SA-2
<PAGE>   7



                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                         SA
                                                                     Number
                                                                     ------
RESTRICTED LETTER AGREEMENTS
- ----------------------------
<S>                    <C>                                     <C>
6-1162-RLL-932         Promotional Support

6-1162-RLL-933R2       Option Aircraft                        SA-2

6-1162-RLL-934R1       Disclosure of Confidential             SA-1
                       Information

6-1162-RLL-935R1       Performance Guarantees                 SA-1

6-1162-RLL-936R2       Certain Contractual Matters            SA-2

6-1162-RLL-937         Alternate Advance Payment Schedule

6-1162-RLL-938         ***

6-1162-RLL-939R1       Certification Flight Test Aircraft     SA-1

6-1162-RLL-940R1       Training Matters                       SA-1

6-1162-RLL-941R1       Other Matters                          SA-1

6-1162-RLL-942         Open Configuration Matters

6-1162-RLL-943         Substitution Rights

6-1162-RLL-944         Airframe Maintenance Material Cost
                       Protection Program

6-1162-RLL-945         Comparison of 737-7H4 and 737-3H4
                       Block Fuel Burn

6-1162-RLL-1855R1      Additional Contractual Matters         SA-2

6-1162-RLL-1856        ***                                    SA-1

6-1162-RLL-1857        Service Ready Validation Program       SA-1
                       Field Test

6-1162-RLL-1858        Escalation Matters                     SA-1
</TABLE>



P.A. No. 1810                         iii                                SA-2
<PAGE>   8



                             TABLE OF CONTENTS CON'T
<TABLE>
<CAPTION>
                                                                        SA
                                                                     Number
                                                                     ------
RESTRICTED LETTER AGREEMENTS
- ----------------------------
<S>                           <C>                                    <C>
6-1162-RLL-2036                Amortization of Costs for
                               Customer Unique Changes                SA-1

6-1162-RLL-2037                Reconciliation of the Aircraft         SA-1
                               Basic Price

6-1162-RLL-2073                Maintenance Training Matters           SA-1
</TABLE>





P.A. No. 1810                      iv                                     SA-2
<PAGE>   9



                           PURCHASE AGREEMENT NO. 1810

                                   Relating to

                          BOEING MODEL 737-7H4 AIRCRAFT



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


         This Agreement is entered into as of January 19th 1994, by and between
The Boeing Company, a Delaware corporation, with its principal office in
Seattle, Washington (Boeing), and Southwest Airlines Co., a Texas corporation,
with its principal office in the City of Dallas, State of Texas (Buyer).


Accordingly, Boeing and Buyer agree as follows:








P.A. No. 1810                      1                        
<PAGE>   10




ARTICLE 1.        Subject Matter of Sale.

         1.1   The Aircraft. Subject to the terms and conditions of this
Agreement, Boeing will manufacture and deliver to Buyer and Buyer will purchase
and accept delivery from Boeing of sixty-eight (68) Boeing Model 737-7H4
aircraft (the Aircraft) manufactured in accordance with Boeing Detail
Specification D6-38808-1, dated October 30, 1996, as described in Exhibit A, as
modified from time to time in accordance with this Agreement (Detail
Specification).

         1.2   Additional Goods and Services. In connection with the sale of the
Aircraft, Boeing will also provide to Buyer certain other things under this
Agreement, including data, documents, training and services, all as described in
this Agreement.

         1.3   Performance Guarantees. Any performance guarantees applicable to
the Aircraft will be expressly included in this Agreement. Where performance
guarantees are included in this Agreement other than within the Detail
Specification, such guarantees will be treated as being incorporated in the
Detail Specification by this reference.

         1.4   Defined Terms. For ease of use, certain terms are treated as
defined terms in this Agreement. Such terms are identified with a capital letter
and set forth and/or defined in Exhibit F.





P.A. No. 1810                      1-1                                     SA-2
<PAGE>   11



ARTICLE 2.        Delivery, Title and Risk of Loss.

         2.1   Time of Delivery. The Aircraft will be delivered to Buyer by
Boeing, assembled and ready for flight and Buyer will accept delivery of the
Aircraft, in accordance with the following schedule:

<TABLE>
<CAPTION>
             Month and Year
              of Delivery                            Quantity of Aircraft
             --------------                          --------------------
             <S>                                             <C>
                                Block A Aircraft

             October 1997                                     Two (2)
             November 1997                                    Two (2)

                                Block B Aircraft

             January 1998                                     Two (2)
             February 1998                                    Three (3)
             March 1998                                       Two (2)
             April 1998                                       Two (2)
             May 1998                                         Two (2)
             June 1998                                        One (1)
             July 1998                                        Two (2)
             September 1998                                   Two (2)

                                Block C Aircraft

             February 1999                                    Four (4)
             May 1999                                         Four (4)
             July 1999                                        Four (4)
             September 1999                                   Four (4)

                                Block D Aircraft

             January 2000                                     Four (4)
             March 2000                                       Four (4)
             July 2000                                        Four (4)
             September 2000                                   Three (3)

                                Block E Aircraft

             January 2001                                     Three (3)
             March 2001                                       Three (3)
             July 2001                                        Three (3)
             September 2001                                   Three (3)

                                Block F Aircraft

             October 1998                                     One (1)
             November 1998                                    Two (2)
             December 1998                                    Two (2)
</TABLE>



P.A. No. 1810                      2-1                                     SA-2
<PAGE>   12


         2.2   Notice of Target Delivery Date.  Boeing will give Buyer notice 
of the Target Delivery Date of the Aircraft approximately 30 days prior to the 
scheduled month of delivery.

         2.3   Notice of Delivery Date. If Boeing gives Buyer at least 7 days'
notice of the delivery date of the Aircraft, and an Aircraft delivery is delayed
beyond such delivery date due to the responsibility of Buyer, Buyer will
reimburse Boeing for all costs incurred by Boeing as a result of such delay,
including amounts for storage, insurance, Taxes, preservation or protection of
the Aircraft and interest on payments due.

         2.4   Place of Delivery. The Aircraft will be delivered at an airport
facility selected by Boeing in the State of Washington, unless mutually agreed
otherwise.

         2.5   Title and Risk of Loss.  Title to and risk of loss of an 
Aircraft will pass from Boeing to Buyer upon delivery of such Aircraft, but 
not prior thereto.

         2.6   Bill of Sale. Upon delivery of an Aircraft Boeing will deliver to
Buyer a bill of sale conveying good title to such Aircraft, free of all liens,
claims, charges and encumbrances of every kind whatsoever, and such other
appropriate documents of title as Buyer may reasonably request.




P.A. No. 1810                      2-2                                     SA-2
<PAGE>   13




ARTICLE 3.        Price of Aircraft.

         3.1      Definitions.

                  3.1.1 Special Features are the features incorporated in
Exhibit A which have been selected by Buyer.

                  3.1.2 Base Aircraft Price is the Aircraft Basic Price 
excluding the price of Special Features.

                  3.1.3 Aircraft Basic Price is comprised of the Base Aircraft
Price and the price of the Special Features.

                  3.1.4 Economic Price Adjustment is the adjustment to the
Aircraft Basic Price (Base Aircraft and Special Features) as calculated pursuant
to Exhibit D.

                  3.1.5 Aircraft Price is the total amount Buyer is to pay for
the Aircraft at the time of delivery.

         3.2      Aircraft Basic Price.

                  The Aircraft Basic Price, expressed in July 1992 dollars, is
set forth below:

<TABLE>
<CAPTION>
                                        Block A, B,
                                        C, D & E                 Block F
                                        Aircraft                 Aircraft
                                        -----------              --------
                  <S>                  <C>                         <C>
                  Base Aircraft Price:  $***                       $***
                  Special Features      $***                       $***
                  Aircraft Basic Price  $***                       $***

</TABLE>

         3.3      Aircraft Price.  The Aircraft Price will be established at 
the time of delivery of such Aircraft to Buyer and will be the sum of:

                  3.3.1  the Aircraft Basic Price, which is *** for the Block 
A, B, C, D and E Aircraft and *** for the Block F Aircraft; plus

                  3.3.2  the Economic Price Adjustments for the Aircraft Basic
Price, as calculated pursuant to the formulas set forth in Exhibit D (Price
Adjustments Due to Economic Fluctuations - Aircraft); plus

                  3.3.3 other price adjustments made pursuant to this Agreement
or other written agreements executed by Boeing and Buyer.



P.A. No. 1810                      3-1                                    SA-2
<PAGE>   14

         3.4      Advance Payment Base Price.

                  3.4.1 Advance Payment Base Price. For advance payment
purposes, the following estimated delivery prices of the Aircraft (Advance
Payment Base Price) have been established, using currently available forecasts
of the escalation factors used by Boeing as of the date of signing this
Agreement. The Advance Payment Base Price of each Aircraft is set forth below:


             Month and Year of                         Advance Payment Base
             Scheduled Delivery                        Price per Aircraft
             ------------------                        --------------------

                              Block A Aircraft ***


             October 1997
             November 1997

                              Block B Aircraft ***

             January 1998 
             February 1998 
             March 1998 
             April 1998 
             May 1998 
             June 1998
             July 1998 
             September 1998

                              Block C Aircraft ***

             February 1999
             May 1999
             July 1999
             September 1999

                              Block D Aircraft ***

             January 2000
             March 2000
             July 2000
             September 2000

                              Block E Aircraft ***

             January 2001
             March 2001
             July 2001





P.A. No. 1810                      3-2                                    SA-2
<PAGE>   15

                              Block E Aircraft ***
                                   (Continued)

             September 2001

                              Block F Aircraft ***

             October 1998
             November 1998
             December 1998

                  3.4.2 Adjustment of Advance Payment Base Prices - Long-Lead
Aircraft. For Aircraft scheduled for delivery 36 months or more after the date
of this Agreement, the Advance Payment Base Prices appearing in Article 3.4.1
will be used to determine the amount of the first advance payment to be made by
Buyer on the Aircraft. No later than 25 months before the scheduled month of
delivery of each affected Aircraft, Boeing will increase or decrease the Advance
Payment Base Price of such Aircraft as required to reflect the effects of (i)
any adjustments in the Aircraft Basic Price pursuant to this Agreement and (ii)
the then-current forecasted escalation factors used by Boeing. Boeing will
provide the adjusted Advance Payment Base Prices for each affected Aircraft to
Buyer, and the advance payment schedule will be considered amended to substitute
such adjusted Advance Payment Base Prices.




P.A. No. 1810                      3-3                                    SA-2


<PAGE>   16





6-1162-RLL-933R2

Southwest Airlines Co.
P.O. Box 36611 - Love Field
Dallas, Texas  75235

Subject:  Letter Agreement No. 6-1162-RLL-933R2 to Purchase Agreement
          No. 1810 - Option Aircraft

This Letter Agreement amends Purchase Agreement No. 1810 dated as of
January 19, 1994 (the Agreement) between The Boeing Company (Boeing) and
Southwest Airlines Co. (Buyer) relating to Model 737-7H4 aircraft
(Aircraft).

All terms used and not defined herein will have the same meaning as in
the Agreement.

In consideration of the purchase by Buyer of the Aircraft, Boeing hereby
agrees to manufacture and sell to Buyer sixty-seven (67) additional
Model 737-7H4 aircraft as described in paragraph 1 of Attachment A
hereto (Option Aircraft) and forty-four (44) Model 737-7H4 Rollover
Option Aircraft (Rollover Option Aircraft), subject to the terms and
conditions set forth below.

1.     Delivery of Option Aircraft.

       The Option Aircraft will be delivered to Buyer during or before
the months set forth in the following schedule:

<TABLE>
<CAPTION>
                                     Number of     Option
              Month and Year         Option        Aircraft
              of Delivery            Aircraft      Block   
              --------------         --------      --------
              <S>                    <C>              <C>
              March 1999             Two   (2)        G
              June 1999              Two   (2)        G
              August 1999            Two   (2)        G
              September 1999         One   (1)        G
              October 1999           Two   (2)        G

              April 2000             Three (3)        H
              October 2000           Three (3)        H

              April 2001             Three (3)        I
              October 2001           Three (3)        I
</TABLE>





P.A. No. 1810
                                                                            SA-2


<PAGE>   17


Southwest Airlines Co.
6-1162-RLL-933R2   Page 2





<TABLE>
<CAPTION>
                                     Number of     Option
              Month and Year         Option        Aircraft
              of Delivery            Aircraft      Block   
              --------------         --------      --------
              (continued)
              <S>                    <C>              <C>
              January 2002           Four  (4)        J
              March 2002             Four  (4)        J
              April 2002             Two   (2)        J
              July 2002              Four  (4)        J
              October 2002           Four  (4)        J

              January 2003           Four  (4)        K
              March 2003             Four  (4)        K
              April 2003             Two   (2)        K
              July 2003              Four  (4)        K
              October 2003           Four  (4)        K

              April 2004             Two   (2)        L
              July 2004              Three (3)        L
              August 2004            Two   (2)        M
              September 2004         Three (3)        M
</TABLE>

2.     Delivery of Rollover Option Aircraft.

       2.1    The Rollover Option Aircraft will be delivered to Buyer
during or before the years set forth in the following schedule:

<TABLE>
<CAPTION>
                                                   Option
              Year of        Number of             Aircraft
              Delivery       Option Aircraft       Block   
              --------       ---------------       --------
              <S>            <C>                      <C>
              2004           Eight (8)                M
              2005           Eighteen (18)            N
              2006           Eighteen (18)            O
</TABLE>

       2.2    The forty-four (44) Rollover Option Aircraft are offered
to Buyer subject to the following conditions:

               2.2.1  Buyer can exercise any forty-four (44) of the sixty-seven
(67) Option Aircraft, and will be offered a Rollover Option Aircraft for
each option aircraft exercised up to and including forty-four (44).

               2.2.2  Conversely to Article 2.2.1 above, if Buyer does not
exercise a minimum of forty-four (44) Option Aircraft, one Rollover
Option Aircraft will be deleted for each Option Aircraft not exercised
by Buyer.





P.A. No. 1810
                                                                            SA-2


<PAGE>   18


Southwest Airlines Co.
6-1162-RLL-933R2   Page 3




               2.2.3  When Buyer exercises one or more Option Aircraft, Boeing
will offer the same quantity of Rollover Option Aircraft to Buyer in the
years identified in Article 2.1 above.

               2.2.4  The Rollover Option Aircraft delivery month offered by
Boeing to Buyer will be at least 24 months from the Option exercise date
of the corresponding option.

               2.2.5  When Boeing offers the Rollover Option Aircraft to Buyer,
Buyer will accept such Rollover Option Aircraft by wire transferring
$100,000 to Boeing.  In the event Buyer exercises its option to purchase
the Rollover Option Aircraft, such application will be in accordance
with Article 4.1 herein.

3.     Price.

       3.1    The advance payment base prices of the Option Aircraft set
forth below and in paragraph 2.1 of Attachment A represent the estimated
delivery prices of the Option Aircraft.  The Option Aircraft pricing
elements and associated pricing terms and conditions are given in
Attachment A.

       3.2    Price and escalation provisions for Model 737-7H4 aircraft
delivering after 2001, are not currently available.  The estimated
Advance Payment Base Prices shown in paragraph 3.3 below and in
paragraph 2.1 of Attachment A are based on currently available price and
escalation provisions.  As price and escalation provisions become
available for Model 737-7H4 aircraft delivering after 2001, such price
and escalation provisions will be appropriately applied to the
applicable Option Aircraft.

For additional information relating to price and escalation provisions
applicable to Option Aircraft delivering after 2001 refer to paragraphs
2.3 and 3.2 of Attachment A.

       3.3    The Advance Payment Base Prices of the Option Aircraft
indicated below do include an amount for special features in addition to
those specifically described in Attachment A but do not include any
amount for items of Buyer Furnished Equipment (BFE).  An estimate for
typical special features is *** per Aircraft (expressed in 1992 STE
dollars) and for BFE is *** per Aircraft (expressed in delivery year
dollars).





P.A. No. 1810
                                                                            SA-2


<PAGE>   19


Southwest Airlines Co.
6-1162-RLL-933R2   Page 4




<TABLE>
<CAPTION>
              Month and Year           Advance Payment Base
              of Delivery              Price per Option Aircraft
              --------------           -------------------------
              <S>        <C>
                         Block G Aircraft ***
                         --------------------

              March 1999
              June 1999
              August 1999
              September 1999
              October 1999

                         Block H Aircraft ***
                         --------------------

              April 2000
              October 2000

                         Block I Aircraft ***
                         --------------------

              April 2001
              October 2001

                         Block J Aircraft ***
                         --------------------

              January 2002
              March 2002
              April 2002
              July 2002
              October 2002

                         Block K Aircraft ***
                         --------------------

              January 2003
              March 2003
              April 2003
              July 2003
              October 2003

                         Block L Aircraft ***
                         --------------------

              April 2004
              July 2004

                          Block M Aircraft ***
                          --------------------

              August 2004
              September 2004
</TABLE>

               3.4    The Option Aircraft purchase price will be the applicable
basic price thereof at the time of Option Aircraft delivery adjusted in
accordance with Boeing's Aircraft escalation provisions contained in the
definitive agreement to purchase the Option





P.A. No. 1810
                                                                            SA-2


<PAGE>   20

Southwest Airlines Co.
6-1162-RLL-933R2   Page 5





Aircraft.  The purchase price will include the price for Seller
Purchased Equipment (SPE) if Buyer has elected to change Buyer Furnished
Equipment (BFE) to SPE.

4.     Option Aircraft Payment.

       4.1    In consideration of the granting of the option as set
forth herein, on or before the date Boeing and Buyer enter into a
definitive agreement to purchase the Aircraft, Buyer will pay a deposit
to Boeing of $100,000 for each Option Aircraft (Deposit).  In the event
Buyer exercises its option herein, the amount of the Deposit will be
credited against the first advance payment due for such Option Aircraft
pursuant to the advance payment schedule set forth in paragraph 3 of
Attachment A.  The Deposits for the Option Aircraft will be refunded to
Buyer, without interest, if the parties do not enter into a definitive
Agreement for the Aircraft.

In the event that, after the parties enter into a definitive agreement
to purchase the Aircraft, Buyer does not exercise its option to purchase
the Option Aircraft pursuant to the terms and conditions set forth
herein, Boeing will be entitled to retain the Deposits for the Option
Aircraft except as provided in paragraphs 6 herein.

       4.2    Advance payments in the amount of 30% of the advance
payment base price will be payable on the Option Aircraft in accordance
with paragraph 3 of Attachment A.  The remainder of the Option Aircraft
purchase price is due at the time of delivery of the Option Aircraft.

5.     Option Exercise.

       5.1    To exercise its Option, Buyer will give written or
telegraphic notice thereof to Boeing on or before eighteen (18) months
prior to the first day of the delivery month of each Option Aircraft.

In such notice Buyer will select the Option Model type, and the
applicable delivery positions.

       5.2    It is understood and agreed that Boeing may accelerate the
option exercise dates specified above if Boeing must make production
decisions which are dependent on Buyer's decision to buy the Option
Aircraft.  If Boeing elects to accelerate the option exercise dates,
Boeing will do so by giving written or telegraphic notice thereof to
Buyer.  Such notice will





P.A. No. 1810                                                               SA-2


<PAGE>   21


Southwest Airlines Co.
6-1162-RLL-933R2   Page 6





specify the revised option exercise dates, which will not be earlier
than 30 days after the date of transmittal of such notice, and the
Option Aircraft delivery positions affected by such revision.  If Buyer
fails to exercise its option for any Option Aircraft affected by such
revised dates, the Deposit applicable to such Option Aircraft will be
promptly refunded, with interest, to Buyer.  The interest rate for
calculation of the interest associated with such refund is the rate of
two percent (2%) below the Citibank base rate in effect from time to
time during the period the option deposit is held by Boeing.

6.     Contract Terms.

       It is understood that Boeing and Buyer will use their best
efforts to enter into a definitive agreement for the Option Aircraft
within thirty (30) days after Buyer exercises an option to purchase
Option Aircraft pursuant to paragraph 5 covering the detailed terms and
conditions for the sale of such Option Aircraft.

Such definitive agreement will include the terms and conditions
contained herein together with the terms and conditions, not
inconsistent herewith, contained in Boeing's then-current standard form
of purchase agreement for the sale of Model 737-700 aircraft in effect
as of the date of option exercise and such additional terms and
conditions as may be mutually agreed upon.  In the event the parties
have not entered into such an agreement within the time period
contemplated herein, either party may, exercisable by written or
telegraphic notice given to the other within thirty (30) days after such
period, terminate the purchase of such Option Aircraft.

7.     Termination of Option to Purchase.

       Either Boeing or Buyer may terminate the option to purchase an
Option Aircraft if any of the following events are not accomplished by
the respective dates contemplated in this letter agreement, or in the
Agreement, as the case may be:

       (i)    termination of the purchase of the Aircraft under the
Agreement for any reason;

       (ii)   payment by Buyer of the Deposit with respect to an Option
Aircraft pursuant to paragraph 4.1 herein;

       (iii)  exercise of an option to purchase an Option Aircraft
pursuant to the terms hereof.





P.A. No. 1810
                                                                            SA-2


<PAGE>   22


Southwest Airlines Co.
6-1162-RLL-933R2   Page 7





Any termination of an option to purchase by Boeing which is based on the
termination of the purchase of Aircraft under the Agreement will be on a
one-for-one basis, for each Aircraft so terminated.

Any cancellation of an option to purchase which is based on failure to
make the required Deposit or to exercise the option to purchase shall
only apply to the Option Aircraft so canceled.

Termination of an option to purchase provided by this letter agreement
will be caused by either party giving written notice to the other within
10 days after the applicable date.  Upon receipt of such notice, all
rights and obligations of the parties with respect to an Option Aircraft
for which the option to purchase has been terminate will thereupon
terminate.

If termination is result of a revision of an option exercise date by
Boeing pursuant to paragraph 5.2, Boeing will promptly refund to Buyer,
without interest, any payments received from Buyer, including the
Deposit, with respect to the Option Aircraft for which the option is
terminated.  If termination is for any other reason, Boeing will
promptly refund to Buyer, without interest, any payments received from
Buyer with respect to the affected Option Aircraft, except the Deposit,
which Buyer may apply to any model Boeing aircraft purchased by Buyer
from Boeing at a future date.





P.A. No. 1810
                                                                            SA-2


<PAGE>   23


Southwest Airlines Co.
6-1162-RLL-933R2   Page 8




8.     Confidential Treatment.  Buyer understands that certain
commercial and financial information contained in this Letter Agreement
including any attachments hereto is considered by Boeing as
confidential.  Buyer agrees that it will treat this Letter Agreement and
the information contained herein as confidential and will not, without
the prior written consent of Boeing, disclose this Letter Agreement or
any information contained herein to any other person or entity except as
provided in Letter Agreement No. 6-1162-RLL-934R1.

Very truly yours,

THE BOEING COMPANY



By /s/ Dawn S. Foster
  -------------------------------------

Its Attorney-in-Fact
   ------------------------------------

ACCEPTED AND AGREED TO this

date: June 24, 1997
      -------

SOUTHWEST AIRLINES CO.



By /s/ Gary A. Barron      
  --------------------------

Its Executive VP & COO     
   -------------------------
Attachments





P.A. No. 1810
                                                                            SA-2


<PAGE>   24


Attachment A to
6-1162-RLL-933R2
Page 1



Model 737-7H4 Aircraft

1.     Option Aircraft Description and Changes.

       1.1    Aircraft Description.  The Option Aircraft is described by
Boeing Detail Specification D6-38808-1, Dated October 30 ,1996.

       1.2    Changes.  The Detail Specification will be revised to include:

              (1)    Changes applicable to the basic Model 737-700 aircraft
which are developed by Boeing between the date of the Detail Specification
and the signing of a definitive agreement to purchase the Option Aircraft.

              (2)    Changes mutually agreed upon.

              (3)    Changes required to obtain a Standard Certificate of
Airworthiness.

              (4)    To provide sufficient Option Aircraft manufacturing and
procurement lead time it is necessary for Boeing and Buyer to reach final
agreement on the Option Aircraft configuration, including BFE/SPE vendor
selection fifteen (15) months prior to delivery of each Option Aircraft.  If
such items are not resolved by the indicated dates, Boeing reserves the
right to amend this letter agreement:

                     (i)    to adjust the scheduled delivery of the Option
Aircraft to a later time period and,

                     (ii)   to make such other changes as are appropriate
and consistent with the revised Option Aircraft deliveries.

       1.3    Effect of Changes.  Changes to the Detail Specification
incorporated pursuant to the provisions of the clauses above will include
the effects of such changes upon Option Aircraft weight, balance, design and
performance.  Performance guarantees for the Option Aircraft which are
mutually acceptable to the parties will be included in the definitive
agreement for the Option Aircraft.




P.A. No. 1810
                                                                            SA-2

<PAGE>   25


Attachment A to
6-1162-RLL-933R2
Page 2



2.     Price Description

       2.1    Price Elements Per Aircraft


<TABLE>
<CAPTION>
                         1                2                3
                         -                -                -

                     AIRCRAFT &                        ADV. PMT.
AIRCRAFT          ESTIMATED SPECIAL                    BASE PRICE
DELIVERY           FEATURES PRICE     ESTIMATED        (ELEMENTS)
MO. & YR.           (JULY 1992$)      ESCALATION       1 + 2 + 3 
- ---------          ---------------    ----------       ----------
<S>                     <C>             <C>             <C>
March 1999              ***             ***             ***
June 1999               ***             ***             ***
August 1999             ***             ***             ***
September 1999          ***             ***             ***
October 1999            ***             ***             ***
April 2000              ***             ***             ***
October 2000            ***             ***             ***
April 2001              ***             ***             ***
October 2001            ***             ***             ***
January 2002            ***             ***             ***
March 2002              ***             ***             ***
April 2002              ***             ***             ***
July 2002               ***             ***             ***
October 2002            ***             ***             ***
January 2003            ***             ***             ***
March 2003              ***             ***             ***
April 2003              ***             ***             ***
July 2003               ***             ***             ***
October 2003            ***             ***             ***
April 2004              ***             ***             ***
July 2004               ***             ***             ***
August 2004             ***             ***             ***
September 2004          ***             ***             ***
</TABLE>





Continued Next Page...

P.A. No. 1810
                                                                            SA-2


<PAGE>   26


Attachment A to
6-1162-RLL-933R2
Page 3




2. Price Description. (Continued)

   2.2 Price Adjustments For Option Aircraft Delivering From March
       1999 to October 2001.

       2.2.1  Special Features.  The price for Special Features incorporated
in the Option Aircraft Detail Specification will be adjusted to Boeing's
then-current prices for such features as of the date of execution of the
definitive agreement for the Option Aircraft.

       2.2.2  Escalation Adjustments.  For Option Aircraft delivering from
March 1999 to October 2001, the Aircraft Basic Price and Special Features
price will be escalated according to the provisions of Attachment B to this
letter agreement.

       2.2.3  Price Adjustments for Changes.  Boeing may adjust the Aircraft
Basic Price and the Advance Payment Base Price for any changes mutually
agreed upon subsequent to the date that Buyer and Boeing enter into a
definitive agreement for the Option Aircraft.

       2.2.4  Base Price Adjustments.  The Aircraft Basic Price of the
Option Aircraft will be adjusted for any FAA mandated changes incorporated
into the Option Aircraft.

   2.3 Price Adjustments For Option Aircraft Delivering From January
       2002 through December 2006.

       2.3.1  Special Features.  The price for Special Features incorporated
in the Option Aircraft Detail Specification will be adjusted to Boeing's
then-current prices for such features as of the date of execution of the
definitive agreement for the Option Aircraft.

       2.3.2  Escalation Adjustments.  For escalation provisions applicable
to Option Aircraft delivering after 2001, see paragraph 2.3.6 below.

       2.3.3  Base Price Adjustments for FAA Changes.  The Aircraft Basic
Price of the Option Aircraft will be adjusted for any FAA mandated changes
incorporated into the Aircraft.





P.A. No. 1810
                                                                            SA-2

<PAGE>   27


Attachment A to
6-1162-RLL-933R2
Page 4



       2.3.4  Price Adjustments for Changes.  Boeing may adjust the Aircraft
Basic Price and the Advance Payment Base Price for any changes mutually
agreed upon subsequent to the date that Buyer and Boeing enter into a
definitive agreement for the Option Aircraft.

       2.3.5  Base Price Adjustments.  The Aircraft Basic Price of the
Option Aircraft will be adjusted to Boeing's then-current prices as of the
date of execution of the definitive agreement for the Option Aircraft in
accordance with the agreement reached below.  The Aircraft Basic Price
starting point for options delivering from January 2002 through December
2006 is ***(July 1992 STE).  Such Aircraft Basic Price may increase in
accordance with paragraphs 2.3.1, 2.3.2, 2.3.3 and 2.3.4.  For any other
changes to the Aircraft Basic Price, Boeing may increase the Aircraft Basic
Price by a maximum of ***(July 1992 STE) per year or portion thereof
starting in January 2002.

       2.3.6  Prices for Long Lead Time Aircraft.  Boeing has not
established escalation provisions for Model 737-700 aircraft for delivery
2002 and after.  Such escalation provisions (i) will be incorporated into
the Option Aircraft definitive agreement when such information is available
and (ii) will be the then-current escalation provisions applicable to the
same model aircraft and engines delivering in the same time period as the
Option Aircraft. The resulting revisions to the definitive agreement will
include but not be limited to, adjustment of the Aircraft Basic Price of the
Option Aircraft, the Advance Payment Base Price, the Aircraft escalation
provisions and the advance payment amounts due on the Option Aircraft.

       2.3.7  BFE to SPE.  An estimate of the total price for items of Buyer
Furnished Equipment (BFE) changed to Seller Purchased Equipment (SPE)
pursuant to the Configuration Specification is included in the Option
Aircraft price build-up.  The purchase price of the Option Aircraft will be
adjusted by the price charged to Boeing for such items plus 10% of such
price.  If all BFE except developmental avionics is converted to SPE, Boeing
will waive the 10% fee.

3. Advance Payment Schedules, Prices and Adjustments.

   3.1        Buyer will pay to Boeing advance payments for the Option
Aircraft on the dates and in the amounts determined below.







P.A. No. 1810
                                                                            SA-2

<PAGE>   28


Attachment A to
6-1162-RLL-933R2
Page 5


<TABLE>
<CAPTION>
                                   Amount Due per Aircraft
                                   -----------------------
                                     (Percentage times
   Due Date of Payment          Advance Payment Base Price)
   -------------------                                     
   <S>                                  <C>
   Deposit                                $100,000 (if applicable)

   18 months prior to the first           15% (less the
   day of the scheduled delivery               Deposit if any)
   month of the Aircraft

   12 months prior to the first           5%
   day of the scheduled delivery
   month of the Aircraft

   9 months prior to the first            5%
   day of the scheduled delivery
   month of the Aircraft

   6 months prior to the first            5%
   day of the scheduled delivery
   month of the Aircraft                    
                                         ---

              Total                      30%
</TABLE>

Any advance payments that would be past due as of the date of signing the
definitive purchase agreement for the Option Aircraft in accordance with the
above schedule are due and payable on such date.

       3.2    Option Aircraft advance payment base prices will be increased
or decreased, as appropriate, at the time of signing of the definitive
purchase agreement for the Option Aircraft, using the then-current
forecasted aircraft escalation factors used by Boeing, to determine the
amount of the advance payments to be made by Buyer on the Option Aircraft.





P.A. No. 1810
                                                                            SA-2

<PAGE>   29


Attachment B to
6-1162-RLL-933R2
Page 1

   

                            PRICE ADJUSTMENT DUE TO
                             ECONOMIC FLUCTUATIONS
                           AIRCRAFT PRICE ADJUSTMENT
                             (July 1992 Base Price)


1.     Formula.

       The Aircraft Price Adjustment will be determined at the time of
Aircraft delivery in accordance with the following formula:

       Pa = (P)(L + M - 1)

       Where:

       Pa = Aircraft Price Adjustment.

       L =  .65 x  ECI
                  -----
                  116.2

       M =  .35 x  ICI
                  -----
                  115.9

       P =  Aircraft Basic Price (as set forth in Article 3.2 of this
            Agreement).

     ECI =  A value using the "Employment Cost Index for workers in
            aerospace manufacturing" (aircraft manufacturing, standard
            industrial classification code 3721, compensation, base month
            and year June 1989 = 100), as released by the Bureau of Labor
            Statistics, U.S. Department of Labor on a quarterly basis for
            the months of March, June, September and December, calculated as
            follows: A three-month arithmetic average value (expressed as a
            decimal and rounded to the nearest tenth) will be determined
            using the months set forth in the table below for the applicable
            Aircraft, with the released Employment Cost Index value
            described above for the month of March also being used for the
            months of January and February; the value for June also used for
            April and May; the value for September also used for July and
            August; and the value for December also used for October and
            November.





   P.A. No. 1810
                                                                            SA-2

<PAGE>   30


Attachment B to
6-1162-RLL-933R2
Page 2



     ICI =  The three-month arithmetic average of the released monthly
            values for the Industrial Commodities Index as set forth in the
            "Producer Prices and Price Index" (Base Year 1982 = 100) as
            released by the Bureau of Labor Statistics, U.S. Department of
            Labor values (expressed as a decimal and rounded to the nearest
            tenth) for the months set forth in the table below for the
            applicable Aircraft.

       In determining the value of L, the ratio of ECI divided by 116.2 will
be expressed as a decimal rounded to the nearest ten-thousandth and then
multiplied by .65 with the resulting value also expressed as a decimal and
rounded to the nearest ten-thousandth.

       In determining the value of M, the ratio of ICI divided by 115.9 will
be expressed as a decimal rounded to the nearest ten-thousandth and then
multiplied by .35 with the resulting value also expressed as a decimal and
rounded to the nearest ten-thousandth.

<TABLE>
<CAPTION>
                                   Months to be Utilized
   Month of Scheduled              in Determining the
   Aircraft Delivery               Value of ECI and ICI     
   -----------------               -------------------------
   <S>                             <C>
   January                         June  B, July  B, Aug.  B
   February                        July  B, Aug.  B, Sept. B
   March                           Aug.  B, Sept. B, Oct.  B
   April                           Sept. B, Oct.  B, Nov.  B
   May                             Oct.  B, Nov.  B, Dec.  B
   June                            Nov.  B, Dec.  B, Jan.  D
   July                            Dec.  B, Jan.  D, Feb.  D
   August                          Jan.  D, Feb.  D, Mar.  D
   September                       Feb.  D, Mar.  D, Apr.  D
   October                         Mar.  D, Apr.  D, May   D
   November                        Apr.  D, May   D, June  D
   December                        May   D, June  D, July  D
                                                            
</TABLE>

The following definitions of B and D will apply:

       B  =  The calendar year before the year in which the scheduled month
             of delivery as set forth in Paragraph 1 occurs.

       D  =  The calendar year during which the scheduled month of delivery
             as set forth in Paragraph 1 occurs.


   


P.A. No. 1810
                                                                            SA-2

<PAGE>   31


Attachment B to
6-1162-RLL-933R2
Page 3



2.     If at the time of delivery of an Aircraft Boeing is unable to
determine the Aircraft Price Adjustment because the applicable values to be
used to determine the ECI and ICI have not been released by the Bureau of
Labor Statistics, then:

       2.1    The Aircraft Price Adjustment, to be used at the time of
delivery of each of the Aircraft, will be determined by utilizing the
escalation provisions set forth above.  The values released by the Bureau of
Labor Statistics and available to Boeing 30 days prior to scheduled Aircraft
delivery will be used to determine the ECI and ICI values for the applicable
months (including those noted as preliminary by the Bureau of Labor
Statistics) to calculate the Aircraft Price Adjustment.  If no values have
been released for an applicable month, the provisions set forth in Paragraph
2.2 below will apply.  If prior to delivery of an Aircraft the U.S.
Department of Labor changes the base year for determination of the ECI or
ICI values as defined above, such rebased values will be incorporated in the
Aircraft Price Adjustment calculation.  The payment by Buyer to Boeing of
the amount of the Purchase Price for such Aircraft, as determined at the
time of Aircraft delivery, will be deemed to be the payment for such
Aircraft required at the delivery thereof.

       2.2    If prior to delivery of an Aircraft the U.S. Department of
Labor substantially revises the methodology used for the determination of
the values to be used to determine the ECI and ICI values (in contrast to
benchmark adjustments or other corrections of previously released values),
or for any reason has not released values needed to determine the applicable
Aircraft Price Adjustment, the parties will, prior to delivery of any such
Aircraft, select a substitute for such values from data published by the
Bureau of Labor Statistics or other similar data reported by
non-governmental United States organizations, such substitute to lead in
application to the same adjustment result, insofar as possible, as would
have been achieved by continuing the use of the original values as they may
have fluctuated during the applicable time period.  Appropriate revision of
the formula will be made as required to reflect any substitute values.
However, if within 24 months from delivery of the Aircraft the Bureau of
Labor Statistics should resume releasing values for the months needed to
determine the Aircraft Price Adjustment, such values will be used to
determine any increase or decrease in the Aircraft Price Adjustment for the
Aircraft from that determined at the time of delivery of such Aircraft.




   
P.A. No. 1810
                                                                            SA-2

<PAGE>   32


Attachment B to
6-1162-RLL-933R2
Page 4



       2.3    In the event escalation provisions are made non-enforceable or
otherwise rendered null and void by any agency of the United States
Government, the parties agree, to the extent they may lawfully do so, to
equitably adjust the Purchase Price of any affected Aircraft to reflect an
allowance for increases or decreases in labor compensation and material
costs occurring since February, 1992, which is consistent with the
applicable provisions of paragraph 1 of this Exhibit D.

3.     For the calculations herein, the values released by the Bureau of
Labor Statistics and available to Boeing 30 days prior to scheduled Aircraft
delivery will be used to determine the ECI and ICI values for the applicable
months (including those noted as preliminary by the Bureau of Labor
Statistics) to calculate the Aircraft Price Adjustment.

Note:  Any rounding of a number, as required under this Exhibit D with
       respect to escalation of the airframe price, will be accomplished as
       follows:  if the first digit of the portion to be dropped from the
       number to be rounded is five or greater, the preceding digit will be
       raised to the next higher number.





P.A. No. 1810
                                                                            SA-2

<PAGE>   33





6-1162-RLL-936R2


Southwest Airlines Co.
P.O. Box 36611 - Love Field
Dallas, Texas  75235

Subject:                Letter Agreement No. 6-1162-RLL-936R2 to
                        Purchase Agreement No. 1810 -
                        Certain Contractual Matters


This Letter Agreement amends Purchase Agreement No. 1810 dated January 19, 1994
(the Agreement) between The Boeing Company (Boeing) and Southwest Airlines Co.
(Buyer) relating to Model 737-7H4 aircraft (the Aircraft) and Letter Agreement
6-1162-RLL-933R2, dated even date herewith, entitled "Option Aircraft",
relating to the sale by Boeing and the purchase by Buyer of sixty-seven (67)
additional Model 737-7H4 aircraft (the Option Aircraft) and forty-four (44)
Model 737-7H4 Rollover Option Aircraft (Rollover Option Aircraft).

The commitments made herein to Buyer are provided from Boeing and CFM
International Inc. (CFM).

All terms used herein and in the Agreement, and not defined herein, will have
the same meaning as in the Agreement.

1.          Credit Memorandum - Aircraft - Firm Aircraft.

            In consideration of Buyer's purchase of the Aircraft, Boeing will
issue to Buyer at the time of delivery of each Aircraft a credit memorandum
which may be used by Buyer for the purchase of Boeing goods and services or
applied to the final delivery payment for the Aircraft for which the credit was
issued.  The amount of this credit memorandum applicable to each Block A, B, C,
D and E Aircraft will be *** of the Aircraft Basic Price (July 1992 STE $) ***.
The amount of this credit memorandum applicable to each Block F Aircraft will
be *** of the Aircraft Basic Price (July 1992 STE $) ***.

2.          Credit Memorandum - Aircraft - Option Aircraft and Rollover Option
            Aircraft.

            In consideration of Buyer's purchase of the Option Aircraft and
Rollover Option Aircraft, Boeing will issue to Buyer at the time of delivery of
each



P.A. No. 1810                                                         SA-2
<PAGE>   34
Southwest Airlines Co.
6-1162-RLL-936R2   Page 2


Option Aircraft and Rollover Option Aircraft a credit memorandum which may be
used by Buyer for the purchase of Boeing goods and services or applied to the
final delivery payment for the Option Aircraft or Rollover Option Aircraft for
which the credit was issued.  The amount of the credit memorandum applicable to
each Aircraft will be *** of the Aircraft Basic Price (July 1992 STE $) ***.

3.          Simulation Data Credits.
 
            If Buyer purchases one subsequent simulator data package for a
price of $*** dollars (July 1992 STE $), Boeing will issue offsetting credit
memoranda in amounts equal to Boeing's invoice price of such simulator data
concurrent with the issuance of such invoice.  If Buyer purchases one
concurrent simulator data package for a price of $***, Boeing will issue an
offsetting credit memorandum in an amount equal to Boeing's invoice price of
such simulator data package concurrent with the issuance of such invoice.
Buyer understands that the concurrent data package price of $*** (July 1992 STE
$) is valid only if the second simulator is manufactured by the same simulator
manufacturer as the subsequent simulator and the concurrent simulator is
ordered within eight years of the signing of the Agreement.

4.          Credits.

            The Aircraft Basic Price for Buyer's 737-7H4 Aircraft does not
include a price for Dual Flight Management Computer and Five Channel SELCAL.
These two features will be installed in the Aircraft but deactivated.  If Buyer
decides at anytime (whether before or after delivery) to activate this
capability, Buyer will pay Boeing an amount equal to *** (July 1992 STE $) ***
for this installed capability.  If Buyer sells or leases the Aircraft for
operation by a third party and the features are subsequently activated, Buyer
will pay or cause the subsequent buyer or lessee to pay the above described
activation charge to Boeing.

5.          Maximum Takeoff Weight Credit Memoranda.

            Buyer has purchased a Maximum Takeoff Weight of 138,500 pounds for
the Aircraft.  Boeing will, at the time of Aircraft delivery, issue to Buyer a
credit memoranda in the amount of $*** (July 1992 STE $), *** to offset the
price for 500 pounds of Maximum Takeoff Weight.





P.A. No. 1810                                                              SA-2
<PAGE>   35
Southwest Airlines Co.
6-1162-RLL-936R2   Page 3



6.          Confidential Treatment.

            Buyer understands that certain commercial and financial information
contained in this Letter Agreement is considered by Boeing as confidential.
Buyer agrees that it will treat this Letter Agreement and the information
contained herein as confidential and will not, without the prior written
consent of Boeing, disclose this Letter Agreement or any information contained
herein to any other person or entity, except as provided in Letter Agreement
6-1162-RLL-934R1.


Very truly yours,

THE BOEING COMPANY



By /s/ Dawn S. Foster      
   --------------------------

Its Attorney-in-Fact       
   --------------------------


ACCEPTED AND AGREED TO as of this

date: June 24, 1997
     --------

SOUTHWEST AIRLINES CO.



By Gary A. Barron          
   --------------------------

Its  Executive VP & COO    
   --------------------------




P.A. No. 1810                                                              SA-2
<PAGE>   36
6-1162-RLL-1855R1




Southwest Airlines Co.
P.O. Box 36611
Dallas, Texas 75235-1611

Subject:  Letter Agreement No. 6-1162-RLL-1855R1 to
          Purchase Agreement No. 1810
          Additional Contractual Matters

Gentlemen:

This Letter Agreement amends Purchase Agreement No. 1810 (the Agreement) between
The Boeing Company (Boeing) and Southwest Airlines Co. (Buyer) relating to the
sale by Boeing and the purchase by Buyer of sixty-eight (68) Model 737-7H4
aircraft (the Aircraft) and Letter Agreement 6-1162-RLL-933R2, dated even date
herewith, entitled "Option Aircraft", relating to the sale by Boeing and the
purchase by Buyer of sixty-seven (67) additional Model 737-7H4 aircraft (the
Option Aircraft).

All terms used herein and in the Agreement, and not defined herein, will have
the same meaning as in the Agreement.

1.   ***
     for the Aircraft.

     In further consideration of Buyer's purchase of the Aircraft, Boeing will
issue at the time of delivery of each Aircraft a *** (July 1992 STE) escalated
to the month of delivery of the specific Aircraft in accordance with Exhibit D
"Aircraft Price adjustment" to be used by Buyer for the purchase of Boeing and
or CFMI goods and services or applied to the final delivery payment for the
Aircraft for which such ***.


P.A. No. 1810                                                        SA-2
<PAGE>   37
Southwest Airlines Co.
6-1162-RLL-1855R1   Page 2


2.   *** for the Option Aircraft delivering from March 1999 through December 31,
     2001.

     In further consideration of Buyer's purchase of the Option Aircraft
delivering from March 1999 through December 31, 2001, Boeing will issue at the
time of delivery of each such Option Aircraft *** (July 1992 STE) escalated to
the month of delivery of the specific Aircraft in accordance with Exhibit D
"Aircraft Price adjustment" to be used by Buyer for the purchase of Boeing and
or CFMI goods and services or applied to the final delivery payment for the
Option Aircraft for which such ***.

3.   Confidential Treatment

     Buyer understands that certain commercial and financial information
contained in this Letter Agreement are considered by Boeing as confidential.
Buyer agrees that it will treat this Letter Agreement and the information
contained herein as confidential and will not, without the prior written consent
of Boeing, disclose this Letter Agreement or any information contained herein to
any other person or entity, except as provided in Letter Agreement
6-1162-RLL-934R1.

Very truly yours,

THE BOEING COMPANY

By  /s/ Dawn S. Foster
   -----------------------------

Its     Attorney-In-Fact
    ----------------------------


P.A. No. 1810                                                    SA-2
<PAGE>   38
Southwest Airlines Co.
6-1162-RLL-1855R1   Page 3


ACCEPTED AND AGREED TO this

Date:  June 24, 1997


SOUTHWEST AIRLINES CO.

By /s/ Gary A. Barron
   ----------------------------

Its  Executive VP & COO
    ---------------------------





P.A. No. 1810                                                               SA-2
<PAGE>   39


                                                                    Exhibit 10.2


                          Supplemental Agreement No. 3

                                       to

                          Purchase Agreement No. 1810

                                    between

                               The Boeing Company

                                      and

                             SOUTHWEST AIRLINES CO.

                   Relating to Boeing Model 737-7H4 Aircraft

            THIS SUPPLEMENTAL AGREEMENT, entered into as of October 6, 1997, by
and between THE BOEING COMPANY, a Delaware corporation with its principal
offices in Seattle, Washington, (Boeing) and SOUTHWEST AIRLINES CO., a Texas
corporation with its principal offices in City of Dallas, State of Texas
(Buyer);

            WHEREAS, the parties hereto entered into Purchase Agreement No.
1810 dated January 19, 1994, relating to Boeing Model 737-7H4 aircraft (the
Agreement) and;

            WHEREAS, Buyer has agreed to exercise the option to purchase two
(2) additional Option Aircraft delivering in March 1999 (Block "G" Aircraft)
offered pursuant to Letter Agreement 6-1162-RLL-933R2;

            NOW THEREFORE, in consideration of the mutual covenants herein
contained, the parties agree to amend the Agreement as follows:

1.          The Table of Contents of the Agreement is deleted in its entirety
and a new Table of Contents is attached hereto and incorporated into the
Agreement by this reference.

2.          Article 1, entitled "Subject Matter of Sale," 

- ------------------
***         Pursuant to 17 CFR, 240.246-2, confidential information has been
            omitted and has been filed separately with the Securities and
            Exchange Commission pursuant to a Confidential Treatment
            Application filed with the Commission.



P.A. No. 1810                         SA-3-1
<PAGE>   40
paragraph 1.1 entitled "The Aircraft" is deleted in its entirety and replaced
by a new paragraph 1.1 revised to reflect seventy (70) Aircraft. Such new page
1-1 is attached hereto and incorporated into the Agreement by this reference.

3.          Article 2, entitled "Delivery, Title and Risk of Loss," paragraph
2.1, entitled "Time of Delivery," is deleted in its entirety and replaced by a
new paragraph 2.1 revised to add two (2) Block "G" Aircraft.  Such new pages
2-1 and 2-2 are attached hereto and incorporated into the Agreement by this
reference.

4.          Article 3, entitled "Price of Aircraft", paragraph 3.2 entitled
"Aircraft Basic Price" is revised by adding Block "G" to the Aircraft Basic
Price for the Block "F" Aircraft. Paragraph 3.3 entitled "Aircraft Price,"
subparagraph 3.3.1 is revised by adding Block "G" to the Aircraft Basic Price
for the Block "F" Aircraft. Paragraph 3.4 entitled "Advance Payment Base
Price," subparagraph 3.4.1 entitled "Advance Payment Base Price" is revised by
adding Advance Payment Base Prices for the Block "G" Aircraft. Such new pages
3-1, 3-2 and 3-3 are attached hereto and incorporated into the Agreement by
this reference.

5.          Letter Agreement No. 6-1162-RLL-933R2 entitled "Option Aircraft" is
deleted in its entirety and replaced with Letter Agreement No. 6-1162-RLL-933R3
attached hereto and incorporated herein by this reference.  The letter
agreement was revised to reflect the exercise of two (2) Block "G" Aircraft and
the conversion of two (2) Block "M" Rolling Option Aircraft to Option Aircraft.
Article 1, entitled "Delivery of Option Aircraft" is revised by deleting two
(2) Option Aircraft from the Block "G" delivery stream and adding two (2) Block
"M" Aircraft in October 2004. Article 2 entitled "Delivery of Rollover Option
Aircraft," paragraph 2.1 is revised to delete two (2) Block "M" Rolling Option
Aircraft; paragraph 2.2 and subparagraphs 2.2.1 and 2.2.2 are revised by
changing the quantity of Rolling Option Aircraft from forty-four (44) to
forty-two (42).  Article 3 entitled "Price" paragraph 3.3 is revised to delete
the Block "G" Option Aircraft Advance Payment Base Prices and to add Block "M"
Advance Payment Base Prices. Attachment A, Paragraph 2 entitled "Price
Description," subparagraph 2.1 entitled "Price Elements Per Aircraft" is
revised by deleting the March 1999 Option Aircraft and adding the October 2004
Option Aircraft, subparagraph 2.2 entitled "Price Adjustments For Option
Aircraft Delivering from March 1999 to October 2001", is revised to be entitled
"Price Adjustment For Option Aircraft Delivering From June 1999 to October
2001", and subparagraph 2.2.2 is revised to change March 1999 to June 1999.

6.          Letter Agreement No. 6-1162-RLL-936R2 entitled "Certain Contractual
Matters" is deleted in its entirety and replaced with Letter Agreement No.
6-1162-RLL-936R3 attached hereto and incorporated herein by this reference.
The letter agreement was revised to reflect the exercise of two (2) Block "G"
Aircraft and





P.A. No. 1810                         SA-3-2
<PAGE>   41
the conversion of two (2) Block "M" Rolling Option Aircraft to Option Aircraft.
Article 1 entitled "Credit Memorandum - Aircraft - Firm Aircraft," is revised
to add the credit memorandum amount for the Block "G" Aircraft.

7.          Letter Agreement No. 6-1162-RLL-1855R1 entitled "Additional
Contractual Matters," is deleted in its entirety and replaced with Letter
Agreement No. 6-1162-RLL-1855R2 attached hereto and incorporated herein by this
reference.  The letter agreement was revised to reflect the exercise of two (2)
Block "G" Aircraft.  Article 2 entitled *** for the Option Aircraft delivering
from March 1999 through December 31, 2001," is revised to be entitled *** for
the Option Aircraft Delivering from June 1999 through December 31, 2001.

8.          The amount due Boeing as a result of the conversion of two Rolling
Option Aircraft to Option Aircraft is ***.  However, as a result of the Option
exercise Buyer has overpaid the advance payments due at 18 months prior to
delivery of the 2 exercised Option Aircraft, resulting in ***.  Accordingly,
concurrent with execution of this Supplemental Agreement, Buyer will pay to
Boeing ***.

9.          All references in the Letter Agreements associated with Purchase
Agreement No. 1810 shall be deemed to refer to the purchase by Buyer of seventy
(70) Model 737-7H4 Aircraft and forty-two (42) Model 737-7H4 Rollover Option
Aircraft, to the extent such reference is not specifically addressed herein.

The Agreement will be deemed to be supplemented to the extent herein provided
and as so supplemented will continue in full force and effect.

EXECUTED IN DUPLICATE as of the day and year first above written.

THE BOEING COMPANY                              SOUTHWEST AIRLINES CO.



By:    /s/ Dawn S. Foster           By:  /s/ Gary A. Barron  
    ------------------------           ----------------------


Its:    Attorney-In-Fact            Its: Executive VP and COO
     -----------------------            ---------------------




P.A. No. 1810                         SA-3-3
<PAGE>   42





                               PURCHASE AGREEMENT

                                     between

                               THE BOEING COMPANY

                                       and

                             SOUTHWEST AIRLINES CO.






                    Relating to Boeing Model 737-7H4 Aircraft

                         Purchase Agreement Number 1810



P.A. No. 1810
<PAGE>   43

<TABLE>
<CAPTION>

                                TABLE OF CONTENTS


                                                                    Page      SA
                                                                  Number  Number
                                                                  ------  ------
ARTICLES
- --------

<S>           <C>                                                 <C>     <C>
1.            Subject Matter of Sale.................................1-1    SA-3

2.            Delivery, Title and Risk
              of Loss................................................2-1    SA-3

3.            Price of Aircraft......................................3-1    SA-3

4.            Taxes..................................................4-1

5.            Payment................................................5-1

6.            Excusable Delay........................................6-1

7.            Changes to the Detail
              Specification..........................................7-1    SA-1

8.            Federal Aviation Requirements and
              Certificates and Export License........................8-1

9.            Representatives, Inspection,
              Flights and Test Data..................................9-1

10.           Assignment, Resale or Lease...........................10-1

11.           Termination for Certain Events........................11-1

12.           Product Assurance; Disclaimer and
              Release; Exclusion of Liabilities;
              Customer Support; Indemnification
              and Insurance.........................................12-1

13.           Buyer Furnished Equipment and
              Spare Parts...........................................13-1

14.           Contractual Notices and Requests......................14-1

15.           Miscellaneous.........................................15-1

</TABLE>


P.A. No. 1810                                                         SA-3
                                       i
<PAGE>   44


<TABLE>
<CAPTION>

                                TABLE OF CONTENTS


                                                                              SA
                                                                          Number
                                                                          ------
EXHIBITS
- --------

<S>           <C>                                                         <C>
A             Aircraft Configuration                                       SA-1

B             Product Assurance Document                                   SA-1

C             Customer Support Document

D             Price Adjustments Due to
              Economic Fluctuations - Aircraft

E             Buyer Furnished Equipment
              Provisions Document

F             Defined Terms Document


</TABLE>



LETTER AGREEMENTS
- -----------------

1810-1        Waiver of Aircraft Demonstration Flight





P.A. No. 1810                                                     SA-3
                                       ii
<PAGE>   45

<TABLE>
<CAPTION>


                                TABLE OF CONTENTS
                                                                              SA
                                                                          Number
RESTRICTED LETTER AGREEMENTS
- ----------------------------                                              ------

<S>               <C>                                                     <C>
6-1162-RLL-932    Promotional Support

6-1162-RLL-933R3  Option Aircraft                                          SA-3

6-1162-RLL-934R1  Disclosure of Confidential                               SA-1
                  Information

6-1162-RLL-935R1  Performance Guarantees                                   SA-1

6-1162-RLL-936R3  Certain Contractual Matters                              SA-3

6-1162-RLL-937    Alternate Advance Payment Schedule

6-1162-RLL-938    ***

6-1162-RLL-939R1  Certification Flight Test Aircraft                       SA-1

6-1162-RLL-940R1  Training Matters                                         SA-1

6-1162-RLL-941R1  Other Matters                                            SA-1

6-1162-RLL-942    Open Configuration Matters

6-1162-RLL-943    Substitution Rights

6-1162-RLL-944    Airframe Maintenance Material Cost
                  Protection Program

6-1162-RLL-945    Comparison of 737-7H4 and 737-3H4
                  Block Fuel Burn

6-1162-RLL-1855R2 Additional Contractual Matters                           SA-3

6-1162-RLL-1856   ***                                                      SA-1

6-1162-RLL-1857   Service Ready Validation Program                         SA-1
                  Field Test

6-1162-RLL-1858   Escalation Matters                                       SA-1

</TABLE>


P.A. No. 1810                                                              SA-3
                                      iii
<PAGE>   46

<TABLE>
<CAPTION>


                             TABLE OF CONTENTS CON'T

                                                                              SA
                                                                          Number
RESTRICTED LETTER AGREEMENTS
- ----------------------------                                              ------

<S>               <C>                                                     <C>
6-1162-RLL-2036   Amortization of Costs for
                  Customer Unique Changes                                  SA-1

6-1162-RLL-2037   Reconciliation of the Aircraft                           SA-1
                  Basic Price

6-1162-RLL-2073   Maintenance Training Matters                             SA-1

</TABLE>




P.A. No. 1810                                                              SA-3
                                       iv
<PAGE>   47


                           PURCHASE AGREEMENT NO. 1810

                                   Relating to

                          BOEING MODEL 737-7H4 AIRCRAFT

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


     This Agreement is entered into as of January 19th 1994, by and between The
Boeing Company, a Delaware corporation, with its principal office in Seattle,
Washington (Boeing), and Southwest Airlines Co., a Texas corporation, with its
principal office in the City of Dallas, State of Texas (Buyer).


Accordingly, Boeing and Buyer agree as follows:





                                       1
P.A. No. 1810
<PAGE>   48


ARTICLE 1.     Subject Matter of Sale.

     1.1 The Aircraft. Subject to the terms and conditions of this Agreement,
Boeing will manufacture and deliver to Buyer and Buyer will purchase and accept
delivery from Boeing of seventy (70) Boeing Model 737-7H4 aircraft (the
Aircraft) manufactured in accordance with Boeing Detail Specification
D6-38808-1, dated October 30, 1996, as described in Exhibit A, as modified from
time to time in accordance with this Agreement (Detail Specification).

     1.2 Additional Goods and Services. In connection with the sale of the
Aircraft, Boeing will also provide to Buyer certain other things under this
Agreement, including data, documents, training and services, all as described in
this Agreement.

     1.3 Performance Guarantees. Any performance guarantees applicable to the
Aircraft will be expressly included in this Agreement. Where performance
guarantees are included in this Agreement other than within the Detail
Specification, such guarantees will be treated as being incorporated in the
Detail Specification by this reference.

     1.4 Defined Terms. For ease of use, certain terms are treated as defined
terms in this Agreement. Such terms are identified with a capital letter and set
forth and/or defined in Exhibit F.



                                      1-1
P.A. No. 1810                                                               SA-3
<PAGE>   49

ARTICLE 2.     Delivery, Title and Risk of Loss.

     2.1 Time of Delivery. The Aircraft will be delivered to Buyer by Boeing,
assembled and ready for flight and Buyer will accept delivery of the Aircraft,
in accordance with the following schedule:

<TABLE>
<CAPTION>
       <S>         <C>        <C>
       Month and Year
         of Delivery          Quantity of Aircraft
       --------------         --------------------

                   Block A Aircraft
                   ----------------

       October 1997                Two (2)
       November 1997               Two (2)

                   Block B Aircraft
                   ----------------

       January 1998                Two (2)
       February 1998               Three (3)
       March 1998                  Two (2)
       April 1998                  Two (2)
       May 1998                    Two (2)
       June 1998                   One (1)
       July 1998                   Two (2)
       September 1998              Two (2)

                   Block C Aircraft
                   ----------------

       February 1999               Four (4)
       May 1999                    Four (4)
       July 1999                   Four (4)
       September 1999              Four (4)

                   Block D Aircraft
                   ----------------

       January 2000                Four (4)
       March 2000                  Four (4)
       July 2000                   Four (4)
       September 2000              Three (3)

                   Block E Aircraft
                   ----------------

       January 2001                Three (3)
       March 2001                  Three (3)
       July 2001                   Three (3)
       September 2001              Three (3)

                   Block F Aircraft
                   ----------------

       October 1998                One (1)
       November 1998               Two (2)
       December 1998               Two (2)

</TABLE>



                                      2-1
P.A. No. 1810                                                   SA-3
<PAGE>   50

                   Block G Aircraft
                   ----------------

       March 1999                  Two (2)

     2.2 Notice of Target Delivery Date. Boeing will give Buyer notice of the
Target Delivery Date of the Aircraft approximately 30 days prior to the
scheduled month of delivery.

     2.3 Notice of Delivery Date. If Boeing gives Buyer at least 7 days' notice
of the delivery date of the Aircraft, and an Aircraft delivery is delayed beyond
such delivery date due to the responsibility of Buyer, Buyer will reimburse
Boeing for all costs incurred by Boeing as a result of such delay, including
amounts for storage, insurance, Taxes, preservation or protection of the
Aircraft and interest on payments due.

     2.4 Place of Delivery. The Aircraft will be delivered at an airport
facility selected by Boeing in the State of Washington, unless mutually agreed
otherwise.

     2.5 Title and Risk of Loss. Title to and risk of loss of an Aircraft will
pass from Boeing to Buyer upon delivery of such Aircraft, but not prior thereto.

     2.6 Bill of Sale. Upon delivery of an Aircraft Boeing will deliver to Buyer
a bill of sale conveying good title to such Aircraft, free of all liens, claims,
charges and encumbrances of every kind whatsoever, and such other appropriate
documents of title as Buyer may reasonably request.


                                      2-2
P.A. No. 1810                                                              SA-3
<PAGE>   51

ARTICLE 3.     Price of Aircraft.

       3.1  Definitions.

            3.1.1 Special Features are the features incorporated in Exhibit A
which have been selected by Buyer.

            3.1.2 Base Aircraft Price is the Aircraft Basic Price excluding the
price of Special Features.

            3.1.3 Aircraft Basic Price is comprised of the Base Aircraft Price
and the price of the Special Features.

            3.1.4 Economic Price Adjustment is the adjustment to the Aircraft
Basic Price (Base Aircraft and Special Features) as calculated pursuant to
Exhibit D.

            3.1.5 Aircraft Price is the total amount Buyer is to pay for the
Aircraft at the time of delivery.

     3.2    Aircraft Basic Price.

            The Aircraft Basic Price, expressed in July 1992 dollars, is set
forth below:

<TABLE>
<CAPTION>

                                    Block A, B,
                                    C, D & E      Block F & G
                                    Aircraft      Aircraft
                                    --------      --------

              <S>                   <C>           <C> 
              Base Aircraft Price:  $***          $***
              Special Features      $***          $***

              Aircraft Basic Price  $***          $***

</TABLE>

     3.3    Aircraft Price. The Aircraft Price will be established at the time
of delivery of such Aircraft to Buyer and will be the sum of:

            3.3.1 the Aircraft Basic Price, which is *** for the Block A, B, C,
D and E Aircraft and *** for the Block F and Block G Aircraft; plus

            3.3.2 the Economic Price Adjustments for the Aircraft Basic Price,
as calculated pursuant to the formulas set forth in Exhibit D (Price Adjustments
Due to Economic Fluctuations - Aircraft); plus

            3.3.3 other price adjustments made pursuant to this Agreement or
other written agreements executed by Boeing and Buyer.


                                      3-1
P.A. No. 1810
<PAGE>   52

     3.4  Advance Payment Base Price.

          3.4.1 Advance Payment Base Price. For advance payment purposes, the
following estimated delivery prices of the Aircraft (Advance Payment Base Price)
have been established, using currently available forecasts of the escalation
factors used by Boeing as of the date of signing this Agreement. The Advance
Payment Base Price of each Aircraft is set forth below:

<TABLE>
<CAPTION>

       Month and Year of           Advance Payment Base
       Scheduled Delivery          Price per Aircraft
       ------------------          --------------------
       <S>       <C>               <C>
                 Block A Aircraft ***
                 --------------------

       October 1997
       November 1997

                 Block B Aircraft ***
                 --------------------

       January 1998 February 1998 March 1998 April 1998 May 1998 June 1998 July
       1998 September 1998

                 Block C Aircraft ***
                 --------------------

       February 1999
       May 1999
       July 1999
       September 1999

                 Block D Aircraft ***
                 --------------------

       January 2000
       March 2000
       July 2000
       September 2000

                 Block E Aircraft ***
                 --------------------

       January 2001
       March 2001
       July 2001

</TABLE>

                                      3-2
P.A. No. 1810
<PAGE>   53

<TABLE>

       <S>        <C>
                  Block E Aircraft ***
                  --------------------
                  (Continued)

       September 2001

                  Block F Aircraft ***
                  --------------------

       October 1998
       November 1998
       December 1998

                  Block G Aircraft ***
                  --------------------
</TABLE>

       March 1999

          3.4.2 Adjustment of Advance Payment Base Prices - Long-Lead Aircraft.
For Aircraft scheduled for delivery 36 months or more after the date of this
Agreement, the Advance Payment Base Prices appearing in Article 3.4.1 will be
used to determine the amount of the first advance payment to be made by Buyer on
the Aircraft. No later than 25 months before the scheduled month of delivery of
each affected Aircraft, Boeing will increase or decrease the Advance Payment
Base Price of such Aircraft as required to reflect the effects of (i) any
adjustments in the Aircraft Basic Price pursuant to this Agreement and (ii) the
then-current forecasted escalation factors used by Boeing. Boeing will provide
the adjusted Advance Payment Base Prices for each affected Aircraft to Buyer,
and the advance payment schedule will be considered amended to substitute such
adjusted Advance Payment Base Prices.


                                      3-3
P.A. No. 1810
<PAGE>   54




6-1162-RLL-933R3


Southwest Airlines Co.
P.O. Box 36611 - Love Field
Dallas, Texas  75235

Subject:    Letter Agreement No. 6-1162-RLL-933R3 to Purchase Agreement 
            No. 1810 - Option Aircraft


This Letter Agreement amends Purchase Agreement No. 1810 dated as of January
19, 1994 (the Agreement) between The Boeing Company (Boeing) and Southwest
Airlines Co. (Buyer) relating to Model 737-7H4 aircraft (Aircraft).

All terms used and not defined herein will have the same meaning as in the
Agreement.

In consideration of the purchase by Buyer of the Aircraft, Boeing hereby agrees
to manufacture and sell to Buyer sixty-seven (67) additional Model 737-7H4
aircraft as described in paragraph 1 of Attachment A hereto (Option Aircraft)
and forty-two (42) Model 737-7H4 Rollover Option Aircraft (Rollover Option
Aircraft), subject to the terms and conditions set forth below.

1.          Delivery of Option Aircraft.

            The Option Aircraft will be delivered to Buyer during or before the
months set forth in the following schedule:

<TABLE>
<CAPTION>
                                          Number of               Option
            Month and Year                Option                  Aircraft
            of Delivery                   Aircraft                Block   
            --------------                --------                --------
            <S>                           <C>                        <C>
            June 1999                     Two   (2)                    G
            August 1999                   Two   (2)                    G
            September 1999                One   (1)                    G
            October 1999                  Two   (2)                    G
                                         
            April 2000                    Three (3)                    H
            October 2000                  Three (3)                    H
                                         
            April 2001                    Three (3)                    I
            October 2001                  Three (3)                    I
</TABLE>                                 




P.A. No. 1810                                                               SA-3
<PAGE>   55
Southwest Airlines Co.
6-1162-RLL-933R3   Page 2



<TABLE>
<CAPTION>
                                          Number of               Option
            Month and Year                Option                  Aircraft
            of Delivery                   Aircraft                Block   
            --------------                --------                --------
            (continued)                  
            <S>                           <C>                         <C>
            January 2002                  Four  (4)                    J
            March 2002                    Four  (4)                    J
            April 2002                    Two   (2)                    J
            July 2002                     Four  (4)                    J
            October 2002                  Four  (4)                    J
                                         
            January 2003                  Four  (4)                    K
            March 2003                    Four  (4)                    K
            April 2003                    Two   (2)                    K
            July 2003                     Four  (4)                    K
            October 2003                  Four  (4)                    K
                                         
            April 2004                    Two   (2)                    L
            July 2004                     Three (3)                    L
            August 2004                   Two   (2)                    M
            September 2004                Three (3)                    M
            October 2004                  Two   (2)                    M
</TABLE>                                 

2.          Delivery of Rollover Option Aircraft.

            2.1         The Rollover Option Aircraft will be delivered to Buyer
during or before the years set forth in the following schedule:

<TABLE>
<CAPTION>
                                                                    Option
            Year of                  Number of                      Aircraft
            Delivery                 Option Aircraft                Block   
            --------                 ---------------                --------
            <S>                      <C>                               <C>
            2004                     Six (6)                           M
            2005                     Eighteen (18)                     N
            2006                     Eighteen (18)                     O
</TABLE>                                                           

            2.2         The forty-two (42) Rollover Option Aircraft are offered
to Buyer subject to the following conditions:

                        2.2.1       Buyer can exercise any forty-two (42) of
the sixty-seven (67) Option Aircraft, and will be offered a Rollover Option
Aircraft for each option aircraft exercised up to and including forty-two (42).

                        2.2.2       Conversely to Article 2.2.1 above, if Buyer
does not exercise a minimum of forty-two (42) Option Aircraft, one Rollover
Option Aircraft will be deleted for each Option Aircraft not exercised by
Buyer.





P.A. No. 1810                                                               SA-3
<PAGE>   56
Southwest Airlines Co.
6-1162-RLL-933R3   Page 3


                        2.2.3       When Buyer exercises one or more Option
Aircraft, Boeing will offer the same quantity of Rollover Option Aircraft to
Buyer in the years identified in Article 2.1 above.

                        2.2.4       The Rollover Option Aircraft delivery month
offered by Boeing to Buyer will be at least 24 months from the Option exercise
date of the corresponding option.

                        2.2.5       When Boeing offers the Rollover Option
Aircraft to Buyer, Buyer will accept such Rollover Option Aircraft by wire
transferring $100,000 to Boeing.  In the event Buyer exercises its option to
purchase the Rollover Option Aircraft, such application will be in accordance
with Article 4.1 herein.

3.          Price.

            3.1         The advance payment base prices of the Option Aircraft
set forth below and in paragraph 2.1 of Attachment A represent the estimated
delivery prices of the Option Aircraft.  The Option Aircraft pricing elements
and associated pricing terms and conditions are given in Attachment A.

            3.2         Price and escalation provisions for Model 737-7H4
aircraft delivering after 2001, are not currently available.  The estimated
Advance Payment Base Prices shown in paragraph 3.3 below and in paragraph 2.1
of Attachment A are based on currently available price and escalation
provisions.  As price and escalation provisions become available for Model
737-7H4 aircraft delivering after 2001, such price and escalation provisions
will be appropriately applied to the applicable Option Aircraft.

For additional information relating to price and escalation provisions
applicable to Option Aircraft delivering after 2001 refer to paragraphs 2.3 and
3.2 of Attachment A.

            3.3         The Advance Payment Base Prices of the Option Aircraft
indicated below do include an amount for special features in addition to those
specifically described in Attachment A but do not include any amount for items
of Buyer Furnished Equipment (BFE).  An estimate for typical special features
is *** per Aircraft (expressed in 1992 STE dollars) and for BFE is *** per
Aircraft (expressed in delivery year dollars).





P.A. No. 1810                                                               SA-3
<PAGE>   57
Southwest Airlines Co.
6-1162-RLL-933R3   Page 4


<TABLE>
<CAPTION>
            Month and Year                            Advance Payment Base
            of Delivery                               Price per Option Aircraft
            --------------                            -------------------------
            <S>                                    <C>
                            Block G Aircraft ***
                            --------------------


            June 1999
            August 1999
            September 1999
            October 1999

                            Block H Aircraft ***
                            --------------------

            April 2000
            October 2000

                            Block I Aircraft ***
                            --------------------

            April 2001
            October 2001

                            Block J Aircraft ***
                            --------------------

            January 2002
            March 2002
            April 2002
            July 2002
            October 2002

                            Block K Aircraft ***
                            --------------------

            January 2003
            March 2003
            April 2003
            July 2003
            October 2003

                            Block L Aircraft ***
                            --------------------

            April 2004
            July 2004

                            Block M Aircraft ***
                            --------------------

            August 2004
            September 2004
            October 2004
</TABLE>

            3.4         The Option Aircraft purchase price will be the
applicable basic price thereof at the time of Option Aircraft delivery adjusted
in accordance with Boeing's Aircraft escalation provisions contained in




P.A. No. 1810                                                               SA-3
<PAGE>   58
Southwest Airlines Co.
6-1162-RLL-933R3   Page 5


the definitive agreement to purchase the Option Aircraft.  The purchase price
will include the price for Seller Purchased Equipment (SPE) if Buyer has
elected to change Buyer Furnished Equipment (BFE) to SPE.

4.          Option Aircraft Payment.

            4.1         In consideration of the granting of the option as set
forth herein, on or before the date Boeing and Buyer enter into a definitive
agreement to purchase the Aircraft, Buyer will pay a deposit to Boeing of
$100,000 for each Option Aircraft (Deposit).  In the event Buyer exercises its
option herein, the amount of the Deposit will be credited against the first
advance payment due for such Option Aircraft pursuant to the advance payment
schedule set forth in paragraph 3 of Attachment A.  The Deposits for the Option
Aircraft will be refunded to Buyer, without interest, if the parties do not
enter into a definitive Agreement for the Aircraft.

In the event that, after the parties enter into a definitive agreement to
purchase the Aircraft, Buyer does not exercise its option to purchase the
Option Aircraft pursuant to the terms and conditions set forth herein, Boeing
will be entitled to retain the Deposits for the Option Aircraft except as
provided in paragraphs 6 herein.

            4.2         Advance payments in the amount of 30% of the advance
payment base price will be payable on the Option Aircraft in accordance with
paragraph 3 of Attachment A.  The remainder of the Option Aircraft purchase
price is due at the time of delivery of the Option Aircraft.

5.          Option Exercise.

            5.1         To exercise its Option, Buyer will give written or
telegraphic notice thereof to Boeing on or before eighteen (18) months prior to
the first day of the delivery month of each Option Aircraft.

In such notice Buyer will select the Option Model type, and the applicable
delivery positions.

            5.2         It is understood and agreed that Boeing may accelerate
the option exercise dates specified above if Boeing must make production
decisions which are dependent on Buyer's decision to buy the Option Aircraft.
If Boeing elects to accelerate the option exercise dates, Boeing will do so by
giving written or




P.A. No. 1810                                                               SA-3
<PAGE>   59
Southwest Airlines Co.
6-1162-RLL-933R3   Page 6


telegraphic notice thereof to Buyer.  Such notice will specify the revised
option exercise dates, which will not be earlier than 30 days after the date of
transmittal of such notice, and the Option Aircraft delivery positions affected
by such revision.  If Buyer fails to exercise its option for any Option
Aircraft affected by such revised dates, the Deposit applicable to such Option
Aircraft will be promptly refunded, with interest, to Buyer.  The interest rate
for calculation of the interest associated with such refund is the rate of two
percent (2%) below the Citibank base rate in effect from time to time during
the period the option deposit is held by Boeing.

6.          Contract Terms.

            It is understood that Boeing and Buyer will use their best efforts
to enter into a definitive agreement for the Option Aircraft within thirty (30)
days after Buyer exercises an option to purchase Option Aircraft pursuant to
paragraph 5 covering the detailed terms and conditions for the sale of such
Option Aircraft.

Such definitive agreement will include the terms and conditions contained
herein together with the terms and conditions, not inconsistent herewith,
contained in Boeing's then-current standard form of purchase agreement for the
sale of Model 737-700 aircraft in effect as of the date of option exercise and
such additional terms and conditions as may be mutually agreed upon.  In the
event the parties have not entered into such an agreement within the time
period contemplated herein, either party may, exercisable by written or
telegraphic notice given to the other within thirty (30) days after such
period, terminate the purchase of such Option Aircraft.

7.          Termination of Option to Purchase.

            Either Boeing or Buyer may terminate the option to purchase an
Option Aircraft if any of the following events are not accomplished by the
respective dates contemplated in this letter agreement, or in the Agreement, as
the case may be:

            (i)         termination of the purchase of the Aircraft under the
Agreement for any reason;

            (ii)        payment by Buyer of the Deposit with respect to an
Option Aircraft pursuant to paragraph 4.1 herein;





P.A. No. 1810                                                               SA-3
<PAGE>   60
Southwest Airlines Co.
6-1162-RLL-933R3   Page 7


            (iii)       exercise of an option to purchase an Option Aircraft
pursuant to the terms hereof.  Any termination of an option to purchase by
Boeing which is based on the termination of the purchase of Aircraft under the
Agreement will be on a one-for-one basis, for each Aircraft so terminated.

Any cancellation of an option to purchase which is based on failure to make the
required Deposit or to exercise the option to purchase shall only apply to the
Option Aircraft so canceled.

Termination of an option to purchase provided by this letter agreement will be
caused by either party giving written notice to the other within 10 days after
the applicable date.  Upon receipt of such notice, all rights and obligations
of the parties with respect to an Option Aircraft for which the option to
purchase has been terminate will thereupon terminate.

If termination is result of a revision of an option exercise date by Boeing
pursuant to paragraph 5.2, Boeing will promptly refund to Buyer, without
interest, any payments received from Buyer, including the Deposit, with respect
to the Option Aircraft for which the option is terminated.  If termination is
for any other reason, Boeing will promptly refund to Buyer, without interest,
any payments received from Buyer with respect to the affected Option Aircraft,
except the Deposit, which Buyer may apply to any model Boeing aircraft
purchased by Buyer from Boeing at a future date.





P.A. No. 1810                                                               SA-3
<PAGE>   61
Southwest Airlines Co.
6-1162-RLL-933R3   Page 8



8.          Confidential Treatment.  Buyer understands that certain commercial
and financial information contained in this Letter Agreement including any
attachments hereto is considered by Boeing as confidential.  Buyer agrees that
it will treat this Letter Agreement and the information contained herein as
confidential and will not, without the prior written consent of Boeing,
disclose this Letter Agreement or any information contained herein to any other
person or entity except as provided in Letter Agreement No. 6-1162-RLL-934R1.

Very truly yours,

THE BOEING COMPANY



By  /s/ Dawn S. Foster     
  --------------------------

Its  Attorney-in-Fact      
  --------------------------

ACCEPTED AND AGREED TO this

date: October 6, 1997

SOUTHWEST AIRLINES CO.



By /s/ Gary A. Barron      
  --------------------------

Its  Executive VP & COO    
  --------------------------

Attachments





P.A. No. 1810                                                               SA-3
<PAGE>   62
Attachment A to
6-1162-RLL-933R3
Page 1


Model 737-7H4 Aircraft

1.          Option Aircraft Description and Changes.

            1.1         Aircraft Description.  The Option Aircraft is described
by Boeing Detail Specification D6-38808-1, Dated October 30 ,1996.

            1.2         Changes.  The Detail Specification will be revised to
include:

                        (1)         Changes applicable to the basic Model
737-700 aircraft which are developed by Boeing between the date of the Detail
Specification and the signing of a definitive agreement to purchase the Option
Aircraft.

                        (2)         Changes mutually agreed upon.

                        (3)         Changes required to obtain a Standard 
Certificate of Airworthiness.

                        (4)         To provide sufficient Option Aircraft
manufacturing and procurement lead time it is necessary for Boeing and Buyer to
reach final agreement on the Option Aircraft configuration, including BFE/SPE
vendor selection fifteen (15) months prior to delivery of each Option Aircraft.
If such items are not resolved by the indicated dates, Boeing reserves the
right to amend this letter agreement:

                                    (i)         to adjust the scheduled
delivery of the Option Aircraft to a later time period and,

                                    (ii)        to make such other changes as
are appropriate and consistent with the revised Option Aircraft deliveries.

            1.3         Effect of Changes.  Changes to the Detail Specification
incorporated pursuant to the provisions of the clauses above will include the
effects of such changes upon Option Aircraft weight, balance, design and
performance.  Performance guarantees for the Option Aircraft which are mutually
acceptable to the parties will be included in the definitive agreement for the
Option Aircraft.





P.A. No. 1810                                                               SA-3
<PAGE>   63
Attachment A to
6-1162-RLL-933R3
Page 2


2.          Price Description

            2.1         Price Elements Per Aircraft


<TABLE>
<CAPTION>
                         1                2                3
                         -                -                -

                     AIRCRAFT &                        ADV. PMT.
AIRCRAFT          ESTIMATED SPECIAL                    BASE PRICE
DELIVERY           FEATURES PRICE     ESTIMATED        (ELEMENTS)
MO. & YR.           (JULY 1992$)      ESCALATION       1 + 2 + 3 
- ---------          ---------------    ----------       ----------
<S>                        <C>      <C>                     <C>
June 1999                  ***           ***               *** 
August 1999                ***           ***               *** 
September 1999             ***           ***               *** 
October 1999               ***           ***               *** 
April 2000                 ***           ***               *** 
October 2000               ***           ***               *** 
April 2001                 ***           ***               *** 
October 2001               ***           ***               *** 
January 2002               ***           ***               *** 
March 2002                 ***           ***               *** 
April 2002                 ***           ***               *** 
July 2002                  ***           ***               *** 
October 2002               ***           ***               *** 
January 2003               ***           ***               *** 
March 2003                 ***           ***               *** 
April 2003                 ***           ***               *** 
July 2003                  ***           ***               *** 
October 2003               ***           ***               *** 
April 2004                 ***           ***               *** 
July 2004                  ***           ***               *** 
August 2004                ***           ***               *** 
September 2004             ***           ***               *** 
October 2004               ***           ***               *** 
</TABLE>                                 





Continued Next Page...

P.A. No. 1810                                                               SA-3
<PAGE>   64
Attachment A to
6-1162-RLL-933R3
Page 3


2.          Price Description. (Continued)

            2.2         Price Adjustments For Option Aircraft Delivering From
                        June 1999 to October 2001.

                        2.2.1       Special Features.  The price for Special
Features incorporated in the Option Aircraft Detail Specification will be
adjusted to Boeing's then-current prices for such features as of the date of
execution of the definitive agreement for the Option Aircraft.

                        2.2.2       Escalation Adjustments.  For Option
Aircraft delivering from June 1999 to October 2001, the Aircraft Basic Price
and Special Features price will be escalated according to the provisions of
Attachment B to this letter agreement.

                        2.2.3       Price Adjustments for Changes.  Boeing may
adjust the Aircraft Basic Price and the Advance Payment Base Price for any
changes mutually agreed upon subsequent to the date that Buyer and Boeing enter
into a definitive agreement for the Option Aircraft.

                        2.2.4       Base Price Adjustments.  The Aircraft Basic
Price of the Option Aircraft will be adjusted for any FAA mandated changes
incorporated into the Option Aircraft.

            2.3         Price Adjustments For Option Aircraft Delivering From
                        January 2002 through December 2006.

                        2.3.1       Special Features.  The price for Special
Features incorporated in the Option Aircraft Detail Specification will be
adjusted to Boeing's then-current prices for such features as of the date of
execution of the definitive agreement for the Option Aircraft.

                        2.3.2       Escalation Adjustments.  For escalation
provisions applicable to Option Aircraft delivering after 2001, see paragraph
2.3.6 below.

                        2.3.3       Base Price Adjustments for FAA Changes.
The Aircraft Basic Price of the Option Aircraft will be adjusted for any FAA
mandated changes incorporated into the Aircraft.





P.A. No. 1810                                                               SA-3
<PAGE>   65
Attachment A to
6-1162-RLL-933R3
Page 4


                        2.3.4       Price Adjustments for Changes.  Boeing may
adjust the Aircraft Basic Price and the Advance Payment Base Price for any
changes mutually agreed upon subsequent to the date that Buyer and Boeing enter
into a definitive agreement for the Option Aircraft.

                        2.3.5       Base Price Adjustments.  The Aircraft Basic
Price of the Option Aircraft will be adjusted to Boeing's then-current prices
as of the date of execution of the definitive agreement for the Option Aircraft
in accordance with the agreement reached below.  The Aircraft Basic Price
starting point for options delivering from January 2002 through December 2006
is *** (July 1992 STE).  Such Aircraft Basic Price may increase in accordance
with paragraphs 2.3.1, 2.3.2, 2.3.3 and 2.3.4.  For any other changes to the
Aircraft Basic Price, Boeing may increase the Aircraft Basic Price by a maximum
of *** (July 1992 STE) per year or portion thereof starting in January 2002.

                        2.3.6       Prices for Long Lead Time Aircraft.  Boeing
has not established escalation provisions for Model 737-700 aircraft for
delivery 2002 and after.  Such escalation provisions (i) will be incorporated
into the Option Aircraft definitive agreement when such information is
available and (ii) will be the then-current escalation provisions applicable to
the same model aircraft and engines delivering in the same time period as the
Option Aircraft. The resulting revisions to the definitive agreement will
include but not be limited to, adjustment of the Aircraft Basic Price of the
Option Aircraft, the Advance Payment Base Price, the Aircraft escalation
provisions and the advance payment amounts due on the Option Aircraft.

                        2.3.7       BFE to SPE.  An estimate of the total price
for items of Buyer Furnished Equipment (BFE) changed to Seller Purchased
Equipment (SPE) pursuant to the Configuration Specification is included in the
Option Aircraft price build-up.  The purchase price of the Option Aircraft will
be adjusted by the price charged to Boeing for such items plus 10% of such
price.  If all BFE except developmental avionics is converted to SPE, Boeing
will waive the 10% fee.

3.          Advance Payment Schedules, Prices and Adjustments.

            3.1         Buyer will pay to Boeing advance payments for the
Option Aircraft on the dates and in the amounts determined below.





P.A. No. 1810                                                               SA-3
<PAGE>   66
Attachment A to
6-1162-RLL-933R3
Page 5


<TABLE>
<CAPTION>
                                                              Amount Due per Aircraft
                                                              -----------------------
                                                                 (Percentage times
Due Date of Payment                                         Advance Payment Base Price)
- -------------------                                                                    
<S>                                                             <C>
Deposit                                                           $100,000 (if applicable)

18 months prior to the first                                      15% (less the
day of the scheduled delivery                                          Deposit if any)
month of the Aircraft

12 months prior to the first                                       5%
day of the scheduled delivery
month of the Aircraft

9 months prior to the first                                        5%
day of the scheduled delivery
month of the Aircraft

6 months prior to the first                                        5%
day of the scheduled delivery
month of the Aircraft                                               
                                                                 ---

                   Total                                          30%
</TABLE>

Any advance payments that would be past due as of the date of signing the
definitive purchase agreement for the Option Aircraft in accordance with the
above schedule are due and payable on such date.

            3.2         Option Aircraft advance payment base prices will be
increased or decreased, as appropriate, at the time of signing of the
definitive purchase agreement for the Option Aircraft, using the then-current
forecasted aircraft escalation factors used by Boeing, to determine the amount
of the advance payments to be made by Buyer on the Option Aircraft.





P.A. No. 1810                                                               SA-3
<PAGE>   67
Attachment B to
6-1162-RLL-933R3
Page 1


                            PRICE ADJUSTMENT DUE TO
                             ECONOMIC FLUCTUATIONS
                           AIRCRAFT PRICE ADJUSTMENT
                             (July 1992 Base Price)


1.          Formula.

            The Aircraft Price Adjustment will be determined at the time of
Aircraft delivery in accordance with the following formula:

            Pa = (P)(L + M - 1)

            Where:

            Pa = Aircraft Price Adjustment.

            L =     .65 x  ECI 
                          -----
                          116.2

            M =     .35 x  ICI 
                          -----
                          115.9

            P =     Aircraft Basic Price (as set forth in Article 3.2 of this
                    Agreement).

          ECI =     A value using the "Employment Cost Index for workers in
                    aerospace manufacturing" (aircraft manufacturing, standard
                    industrial classification code 3721, compensation, base
                    month and year June 1989 = 100), as released by the Bureau
                    of Labor Statistics, U.S. Department of Labor on a
                    quarterly basis for the months of March, June, September
                    and December, calculated as follows: A three-month
                    arithmetic average value (expressed as a decimal and
                    rounded to the nearest tenth) will be determined using the
                    months set forth in the table below for the applicable
                    Aircraft, with the released Employment Cost Index value
                    described above for the month of March also being used for
                    the months of January and February; the value for June also
                    used for April and May; the value for September also used
                    for July and August; and the value for December also used
                    for October and November.





P.A. No. 1810                                                               SA-3
<PAGE>   68
Attachment B to
6-1162-RLL-933R3
Page 2


          ICI =     The three-month arithmetic average of the released monthly
                    values for the Industrial Commodities Index as set forth in
                    the "Producer Prices and Price Index" (Base Year 1982 =
                    100) as released by the Bureau of Labor Statistics, U.S.
                    Department of Labor values (expressed as a decimal and
                    rounded to the nearest tenth) for the months set forth in
                    the table below for the applicable Aircraft.

            In determining the value of L, the ratio of ECI divided by 116.2
will be expressed as a decimal rounded to the nearest ten-thousandth and then
multiplied by .65 with the resulting value also expressed as a decimal and
rounded to the nearest ten-thousandth.

            In determining the value of M, the ratio of ICI divided by 115.9
will be expressed as a decimal rounded to the nearest ten-thousandth and then
multiplied by .35 with the resulting value also expressed as a decimal and
rounded to the nearest ten-thousandth.

<TABLE>
<CAPTION>
                                Months to be Utilized
Month of Scheduled              in Determining the
Aircraft Delivery               Value of ECI and ICI     
- -----------------               -------------------------
<S>                             <C>
January                         June  B, July  B, Aug.  B
February                        July  B, Aug.  B, Sept. B
March                           Aug.  B, Sept. B, Oct.  B
April                           Sept. B, Oct.  B, Nov.  B
May                             Oct.  B, Nov.  B, Dec.  B
June                            Nov.  B, Dec.  B, Jan.  D
July                            Dec.  B, Jan.  D, Feb.  D
August                          Jan.  D, Feb.  D, Mar.  D
September                       Feb.  D, Mar.  D, Apr.  D
October                         Mar.  D, Apr.  D, May   D
November                        Apr.  D, May   D, June  D
December                        May   D, June  D, July  D
</TABLE>

The following definitions of B and D will apply:

            B    =    The calendar year before the year in which the scheduled
                      month of delivery as set forth in Paragraph 1 occurs.

            D    =    The calendar year during which the scheduled month of
                      delivery as set forth in Paragraph 1 occurs.





P.A. No. 1810                                                               SA-3
<PAGE>   69
Attachment B to
6-1162-RLL-933R3
Page 3


2.          If at the time of delivery of an Aircraft Boeing is unable to
determine the Aircraft Price Adjustment because the applicable values to be
used to determine the ECI and ICI have not been released by the Bureau of Labor
Statistics, then:

            2.1         The Aircraft Price Adjustment, to be used at the time
of delivery of each of the Aircraft, will be determined by utilizing the
escalation provisions set forth above.  The values released by the Bureau of
Labor Statistics and available to Boeing 30 days prior to scheduled Aircraft
delivery will be used to determine the ECI and ICI values for the applicable
months (including those noted as preliminary by the Bureau of Labor Statistics)
to calculate the Aircraft Price Adjustment.  If no values have been released
for an applicable month, the provisions set forth in Paragraph 2.2 below will
apply.  If prior to delivery of an Aircraft the U.S. Department of Labor
changes the base year for determination of the ECI or ICI values as defined
above, such rebased values will be incorporated in the Aircraft Price
Adjustment calculation.  The payment by Buyer to Boeing of the amount of the
Purchase Price for such Aircraft, as determined at the time of Aircraft
delivery, will be deemed to be the payment for such Aircraft required at the
delivery thereof.

            2.2         If prior to delivery of an Aircraft the U.S. Department
of Labor substantially revises the methodology used for the determination of
the values to be used to determine the ECI and ICI values (in contrast to
benchmark adjustments or other corrections of previously released values), or
for any reason has not released values needed to determine the applicable
Aircraft Price Adjustment, the parties will, prior to delivery of any such
Aircraft, select a substitute for such values from data published by the Bureau
of Labor Statistics or other similar data reported by non-governmental United
States organizations, such substitute to lead in application to the same
adjustment result, insofar as possible, as would have been achieved by
continuing the use of the original values as they may have fluctuated during
the applicable time period.  Appropriate revision of the formula will be made
as required to reflect any substitute values.  However, if within 24 months
from delivery of the Aircraft the Bureau of Labor Statistics should resume
releasing values for the months needed to determine the Aircraft Price
Adjustment, such values will be used to determine any increase or decrease in
the Aircraft Price Adjustment for the Aircraft from that determined at the time
of delivery of such Aircraft.





P.A. No. 1810                                                               SA-3
<PAGE>   70
Attachment B to
6-1162-RLL-933R3
Page 4


            2.3         In the event escalation provisions are made
non-enforceable or otherwise rendered null and void by any agency of the United
States Government, the parties agree, to the extent they may lawfully do so, to
equitably adjust the Purchase Price of any affected Aircraft to reflect an
allowance for increases or decreases in labor compensation and material costs
occurring since February, 1992, which is consistent with the applicable
provisions of paragraph 1 of this Exhibit D.

3.          For the calculations herein, the values released by the Bureau of
Labor Statistics and available to Boeing 30 days prior to scheduled Aircraft
delivery will be used to determine the ECI and ICI values for the applicable
months (including those noted as preliminary by the Bureau of Labor Statistics)
to calculate the Aircraft Price Adjustment.

Note:       Any rounding of a number, as required under this Exhibit D with
            respect to escalation of the airframe price, will be accomplished
            as follows:  if the first digit of the portion to be dropped from
            the number to be rounded is five or greater, the preceding digit
            will be raised to the next higher number.





P.A. No. 1810                                                               SA-3
<PAGE>   71
6-1162-RLL-936R3


Southwest Airlines Co.
P.O. Box 36611 - Love Field
Dallas, Texas  75235

Subject:      Letter Agreement No. 6-1162-RLL-936R3 to
              Purchase Agreement No. 1810 -
              Certain Contractual Matters


This Letter Agreement amends Purchase Agreement No. 1810 dated January 19, 1994
(the Agreement) between The Boeing Company (Boeing) and Southwest Airlines Co.
(Buyer) relating to Model 737-7H4 aircraft (the Aircraft) and Letter Agreement
6-1162-RLL-933R3, dated even date herewith, entitled "Option Aircraft", relating
to the sale by Boeing and the purchase by Buyer of sixty-seven (67) additional
Model 737-7H4 aircraft (the Option Aircraft) and forty-two (42) Model 737-7H4
Rollover Option Aircraft (Rollover Option Aircraft).

The commitments made herein to Buyer are provided from
Boeing and CFM International Inc. (CFM).

All terms used herein and in the Agreement, and not defined herein, will have
the same meaning as in the Agreement.

1.   Credit Memorandum - Aircraft - Firm Aircraft.

     In consideration of Buyer's purchase of the Aircraft, Boeing will issue to
Buyer at the time of delivery of each Aircraft a credit memorandum which may be
used by Buyer for the purchase of Boeing goods and services or applied to the
final delivery payment for the Aircraft for which the credit was issued. The
amount of this credit memorandum applicable to each Block A, B, C, D and E
Aircraft will be *** of the Aircraft Basic Price (July 1992 STE $) ***. The
amount of this credit memorandum applicable to each Block F and Block G Aircraft
will be *** of the Aircraft Basic Price (July 1992 STE $) ***.

2.   Credit Memorandum - Aircraft - Option Aircraft and Rollover Option
     Aircraft.

     In consideration of Buyer's purchase of the Option Aircraft and Rollover
Option Aircraft, Boeing will issue to Buyer at the time of delivery of each


P.A. No. 1810                                                              SA-3
<PAGE>   72
Southwest Airlines Co.
6-1162-RLL-936R3   Page 2

Option Aircraft and Rollover Option Aircraft a credit memorandum which may be
used by Buyer for the purchase of Boeing goods and services or applied to the
final delivery payment for the Option Aircraft or Rollover Option Aircraft for
which the credit was issued. The amount of the credit memorandum applicable to
each Aircraft will be *** of the Aircraft Basic Price (July 1992 STE $) ***.

3.   Simulation Data Credits.

     If Buyer purchases one subsequent simulator data package for a price of ***
dollars (July 1992 STE $), Boeing will issue offsetting credit memoranda in
amounts equal to Boeing's invoice price of such simulator data concurrent with
the issuance of such invoice. If Buyer purchases one concurrent simulator data
package for a price of ***, Boeing will issue an offsetting credit memorandum in
an amount equel to Boeing's invoice price of such simulator data package
concurrent with the issuance of such invoice. Buyer understands that the
concurrent data package price of *** (July 1992 STE $) is valid only if the
second simulator is manufactured by the same simulator manufacturer as the
subsequent simulator and the concurrent simulator is ordered within eight years
of the signing of the Agreement.

4.   Credits.

     The Aircraft Basic Price for Buyer's 737-7H4 Aircraft does not include a
price for Dual Flight Management Computer and Five Channel SELCAL. These two
features will be installed in the Aircraft but deactivated. If Buyer decides at
anytime (whether before or after delivery) to activate this capability, Buyer
will pay Boeing an amount equal to *** (July 1992 STE $) *** for this installed
capability. If Buyer sells or leases the Aircraft for operation by a third party
and the features are subsequently activated, Buyer will pay or cause the
subsequent buyer or lessee to pay the above described activation charge to
Boeing.

5.   Maximum Takeoff Weight Credit Memoranda.

     Buyer has purchased a Maximum Takeoff Weight of 138,500 pounds for the
Aircraft. Boeing will, at the time of Aircraft delivery, issue to Buyer a credit
memoranda in the amount of *** (July 1992 STE $), *** to offset the price for
500 pounds of Maximum Takeoff Weight.



P.A. No. 1810                                                               SA-3
<PAGE>   73
Southwest Airlines Co.
6-1162-RLL-936R3   Page 3

6.   Confidential Treatment.

     Buyer understands that certain commercial and financial information
contained in this Letter Agreement is considered by Boeing as confidential.
Buyer agrees that it will treat this Letter Agreement and the information
contained herein as confidential and will not, without the prior written consent
of Boeing, disclose this Letter Agreement or any information contained herein to
any other person or entity, except as provided in Letter Agreement
6-1162-RLL-934R1.


Very truly yours,

THE BOEING COMPANY



By  /s/ Dawn S. Foster
   ----------------------------

Its  Attorney-in-Fact
    ---------------------------


ACCEPTED AND AGREED TO as of this

date: October 6, 1997

SOUTHWEST AIRLINES CO.



By /s/ Gary A. Barron
   -----------------------------

Its  Executive VP & COO
   -----------------------------



P.A. No. 1810                                                               SA-3
<PAGE>   74
6-1162-RLL-1855R2




Southwest Airlines Co.
P.O. Box 36611
Dallas, Texas 75235-1611

Subject:  Letter Agreement No. 6-1162-RLL-1855R2 to
          Purchase Agreement No. 1810
          Additional Contractual Matters

Gentlemen:

This Letter Agreement amends Purchase Agreement No. 1810 (the Agreement) between
The Boeing Company (Boeing) and Southwest Airlines Co. (Buyer) relating to the
sale by Boeing and the purchase by Buyer of seventy (70) Model 737-7H4 aircraft
(the Aircraft) and Letter Agreement 6-1162-RLL-933R3, dated even date herewith,
entitled "Option Aircraft", relating to the sale by Boeing and the purchase by
Buyer of sixty-seven (67) additional Model 737-7H4 aircraft (the Option
Aircraft).

All terms used herein and in the Agreement, and not defined herein, will have
the same meaning as in the Agreement.

1.   ***
     for the Aircraft.

     In further consideration of Buyer's purchase of the Aircraft, Boeing will
issue at the time of delivery of each Aircraft a *** (July 1992 STE) escalated
to the month of delivery of the specific Aircraft in accordance with Exhibit D
"Aircraft Price adjustment" to be used by Buyer for the purchase of Boeing and
or CFMI goods and services or applied to the final delivery payment for the
Aircraft for which such ***.


2.   ***
     for the Option Aircraft delivering from June
     1999 through December 31, 2001.


P.A. No. 1810                                                               SA-3
<PAGE>   75
Southwest Airlines Co.
6-1162-RLL-1855R2   Page 2


     In further consideration of Buyer's purchase of the Option Aircraft
delivering from June 1999 through December 31, 2001, Boeing will issue at the
time of delivery of each such Option Aircraft *** (July 1992 STE) escalated to
the month of delivery of the specific Aircraft in accordance with Exhibit D
"Aircraft Price adjustment" to be used by Buyer for the purchase of Boeing and
or CFMI goods and services or applied to the final delivery payment for the
Option Aircraft for which such ***.

3.   Confidential Treatment

     Buyer understands that certain commercial and financial information
contained in this Letter Agreement are considered by Boeing as confidential.
Buyer agrees that it will treat this Letter Agreement and the information
contained herein as confidential and will not, without the prior written consent
of Boeing, disclose this Letter Agreement or any information contained herein to
any other person or entity, except as provided in Letter Agreement
6-1162-RLL-934R1.

Very truly yours,

THE BOEING COMPANY

By  /s/ Dawn S. Foster
   ----------------------------

Its     Attorney-In-Fact
    ---------------------------



P.A. No. 1810                                                               SA-3
<PAGE>   76
Southwest Airlines Co.
6-1162-RLL-1855R2   Page 3




ACCEPTED AND AGREED TO this

Date: October 6, 1997


SOUTHWEST AIRLINES CO.

By   /s/ Gary A. Barron
   ----------------------------

Its  Executive VP & COO
   ----------------------------



P.A. No. 1810                                                               SA-3
<PAGE>   77
                                                                   Exhibit 10.2



                          Supplemental Agreement No. 4

                                       to

                           Purchase Agreement No. 1810

                                     between

                               The Boeing Company

                                       and

                             SOUTHWEST AIRLINES CO.

                    Relating to Boeing Model 737-7H4 Aircraft

         THIS SUPPLEMENTAL AGREEMENT, entered into as of December 19, 1997, by
and between THE BOEING COMPANY, a Delaware corporation with its principal
offices in Seattle, Washington, (Boeing) and SOUTHWEST AIRLINES CO., a Texas
corporation with its principal offices in City of Dallas, State of Texas
(Buyer);

         WHEREAS, the parties hereto entered into Purchase Agreement No. 1810
dated January 19, 1994, relating to Boeing Model 737-7H4 aircraft (the
Agreement) and;

         WHEREAS, Buyer has agreed to exercise the option to purchase forty
seven (47) additional Option Aircraft delivering in June 1999 (2), August 1999
(2), September 1999 (1), October 1999 (2), April 2000 (3), October 2000 (3),
April 2001 (3), October 2001 (3), January 2002 (4), March 2002 (4), April 2002
(2), July 2002 (4), October 2002 (4), January 2003 (4), March 2003 (1), April
2004 (2) and July 2004 (3) offered pursuant to Letter Agreement 6-1162-RLL-933R3
and;

         WHEREAS, Buyer has agreed to purchase twelve (12) additional Aircraft
delivering in November 2000 (1), December 2000 (1), July 2001 (1), September
2001 (1), October 2001 (1), September 2002 (3), September 2003 (3) and March
2004 (1);

- ------------------
***          Pursuant to 17 CFR, 240.246-2, confidential information has been
             omitted and has been filed separately with the Securities and
             Exchange Commission pursuant to a Confidential Treatment
             Application filed with the Commission.



P.A. No. 1810                      SA-4-1
<PAGE>   78

         NOW THEREFORE, in consideration of the mutual covenants herein
contained, the parties agree to amend the Agreement as follows:

1. The Table of Contents of the Agreement is deleted in its entirety and a new
Table of Contents is attached hereto and incorporated into the Agreement by this
reference.

2. Article 1, entitled "Subject Matter of Sale," paragraph 1.1 entitled "The
Aircraft" is deleted in its
entirety and replaced by a new paragraph 1.1 revised to reflect one hundred
twenty-nine (129) Aircraft. Such new page 1-1 is attached hereto and
incorporated into the Agreement by this reference.

3. Article 2, entitled "Delivery, Title and Risk of Loss," paragraph 2.1,
entitled "Time of Delivery," is deleted in its entirety and replaced by a new
paragraph 2.1 revised to add nineteen (19) Block "H" Aircraft, Eighteen (18)
Block "I" Aircraft, five (5) Block "J" Aircraft, five (5) Block "K" Aircraft and
twelve (12) Block "L" Aircraft. Such new pages 2-1, 2-2 and 2-3 are attached
hereto and incorporated into the Agreement by this reference.

4. Article 3, entitled "Price of Aircraft", paragraph 3.2 entitled "Aircraft
Basic Price" is revised by adding Aircraft Basic Prices for the Block "H", Block
"I", Block "J", Block "K" and Block "L" Aircraft. Paragraph 3.3 entitled
"Aircraft Price," subparagraph 3.3.1 is revised by adding Aircraft Basic Prices
for the Block "H", Block "I", Block "J", Block "K" and Block "L" Aircraft.
Paragraph 3.4 entitled "Advance Payment Base Price," subparagraph 3.4.1 entitled
"Advance Payment Base Price" is revised by adding Advance Payment Base Prices
for the Block "H", "I", "J", "K" and "L" Aircraft. Such new pages 3-1, 3-2, 3-3
and 3-4 are attached hereto and incorporated into the Agreement by this
reference.

5. Letter Agreement No. 6-1162-RLL-933R3 entitled "Option Aircraft" is deleted
in its entirety and replaced with Letter Agreement No. 6-1162-RLL-933R4 attached
hereto and incorporated herein by this reference. Article 1, entitled "Delivery
of Option Aircraft" is revised by deleting forty-seven (47) Option Aircraft from
the Block "G", "H", "I", "J", "K" and "L" delivery stream and adding forty-two
(42) Block "M", "N", "O" and "P" Option Aircraft. Article 2 entitled "Delivery
of Rollover Option 



P.A. No. 1810                      SA-4-2
<PAGE>   79

Aircraft," paragraph 2.1 is revised to delete forty-two (42) Block "M", "N" and
"O" Rolling Option Aircraft and add fifty-nine (59) Block "Q", "R" and "S"
Rolling Option Aircraft; paragraph 2.2 and subparagraphs 2.2.1 and 2.2.2 are
revised by changing the quantity of Rolling Option Aircraft from forty-two (42)
to fifty-nine (59), subparagraph 2.2.1 is also revised to change the quantity of
Option Aircraft from sixty-seven (67) to sixty-two (62). Article 3 entitled
"Price" paragraph 3.2 is revised to change 2001 to 2002, paragraph 3.3 is
revised to delete the Block "G", "H", "I", "J", "K" and "L" Option Aircraft
Advance Payment Base Prices and to add Block "M", "N", "O" and "P" Advance
Payment Base Prices. Attachment A, Paragraph 2 entitled "Price Description,"
subparagraph 2.1 entitled "Price Elements Per Aircraft" is revised by deleting
the forty-seven (47) Block "G", "H", "I", "J", "K" and "L" Option Aircraft,
adding the forty-two (42) Block "M", "N", "O" and "P" Option Aircraft and adding
a column for escalation sharing, subparagraph 2.2 entitled "Price Adjustments
For Option Aircraft Delivering from June 1999 to October 2001", is deleted.
Subparagraph 2.3 entitled "Price Adjustments For Option Aircraft Delivering From
January 2002 through December 2006," is renumbered to 2.2 and the title revised
to "Price Adjustments For Option Aircraft Delivering From March 2003 through
October 2006." Subparagraph 2.2.2 is revised to change 2001 to 2002,
subparagraph 2.2.5 is revised to change January 2002 through December 2006 to
March 2003 through October 2006, to change *** for Option deliveries in 2003,
*** for Option deliveries in 2004 and *** for Option deliveries in 2005 and
2006, and to change January 2002 to March 2003. Subparagraph 2.2.6 entitled
"Prices for Long Lead Aircraft" is revised to change 2002 to 2003.

6. Letter Agreement No. 6-1162-RLL-936R3 entitled "Certain Contractual Matters"
is deleted in its entirety and replaced with Letter Agreement No.
6-1162-RLL-936R4 attached hereto and incorporated herein by this reference.
Article 1 entitled "Credit Memorandum - Aircraft - Firm Aircraft," is revised to
add the credit memorandum amount for the Block "H", "I", "J", "K" and "L"
Aircraft.

7. Letter Agreement No. 6-1162-RLL-1855R2 entitled "Additional Contractual
Matters," is deleted in its entirety and replaced with Letter Agreement No.
6-1162-RLL-1855R3 attached hereto and incorporated herein by this reference.
Article 2 entitled *** for the Option Aircraft delivering from June 1999 through
December 31, 2001," is deleted. A new Article 2 entitled *** for the Aircraft,"
and a new Article 3 entitled "Applicable Aircraft," are added.


P.A. No. 1810                      SA-4-3
<PAGE>   80

8. Letter Agreement No. 6-1162-RLL-1858 entitled "Escalation Matters," is
deleted in its entirety and replaced with Letter Agreement No. 6-1162-RLL-1858R1
attached hereto and incorporated herein by this reference. Article 4 entitled
"Escalating Credits (STE)," is revised in the first sentence to add reference to
Letter Agreement No. 6-1162-RLL-1855.

9. This agreement is contingent upon the approval of the Southwest Airlines Co.
Board of Directors, such approval to be granted no later than January 23, 1998.
Until such approval, the amount due Boeing as a result of this supplemental
agreement is ***. Concurrent with Board approval, the balance due for advance
payments and option deposits, per the existing terms and conditions of the
contract, will be forwarded to Boeing.

10. All references in the Letter Agreements associated with Purchase Agreement
No. 1810 shall be deemed to refer to the purchase by Buyer of one hundred
twenty-nine (129) Model 737-7H4 Aircraft, sixty-two (62) Model 737-7H4 Option
Aircraft and fifty-nine (59) Model 737-7H4 Rollover Option Aircraft, to the
extent such reference is not specifically addressed herein.

The Agreement will be deemed to be supplemented to the extent herein provided
and as so supplemented will continue in full force and effect.

EXECUTED IN DUPLICATE as of the day and year first above written.

THE BOEING COMPANY                  SOUTHWEST AIRLINES CO.



By:   /s/ Dawn S. Foster            By:  /s/ Gary A. Barron
    --------------------------          --------------------------

Its:    Attorney-In-Fact            Its: Executive VP and COO
    --------------------------          --------------------------



P.A. No. 1810                      SA-4-4
<PAGE>   81







                               PURCHASE AGREEMENT

                                     between

                               THE BOEING COMPANY

                                       and

                             SOUTHWEST AIRLINES CO.






                    Relating to Boeing Model 737-7H4 Aircraft

                         Purchase Agreement Number 1810





P.A. No. 1810
<PAGE>   82





                                TABLE OF CONTENTS


<TABLE>
<CAPTION>
                                                                                       Page             SA
                                                                                     Number         Number
                                                                                     ------         ------
<S>                                                                                  <C>            <C>
ARTICLES
- --------


1.                       Subject Matter of Sale..........................................1-1          SA-4

2.                       Delivery, Title and Risk
                         of Loss.........................................................2-1          SA-4

3.                       Price of Aircraft...............................................3-1          SA-4

4.                       Taxes...........................................................4-1

5.                       Payment.........................................................5-1

6.                       Excusable Delay.................................................6-1

7.                       Changes to the Detail
                         Specification...................................................7-1          SA-1

8.                       Federal Aviation Requirements and
                         Certificates and Export License.................................8-1

9.                       Representatives, Inspection,
                         Flights and Test Data...........................................9-1

10.                      Assignment, Resale or Lease....................................10-1

11.                      Termination for Certain Events.................................11-1

12.                      Product Assurance; Disclaimer and
                         Release; Exclusion of Liabilities;
                         Customer Support; Indemnification
                         and Insurance..................................................12-1

13.                      Buyer Furnished Equipment and
                         Spare Parts....................................................13-1

14.                      Contractual Notices and Requests...............................14-1

15.                      Miscellaneous..................................................15-1
</TABLE>



P.A. No. 1810                              i
                                                                            SA-4
<PAGE>   83



                                TABLE OF CONTENTS


<TABLE>
<CAPTION>
                                                                                                        SA
                                                                                                    Number
                                                                                                    ------
<S>                                                                                                 <C>
EXHIBITS
- --------


A                        Aircraft Configuration                                                       SA-1

B                        Product Assurance Document                                                   SA-1

C                        Customer Support Document

D                        Price Adjustments Due to
                         Economic Fluctuations - Aircraft

E                        Buyer Furnished Equipment
                         Provisions Document

F                        Defined Terms Document





LETTER AGREEMENTS
- -----------------


1810-1                   Waiver of Aircraft Demonstration Flight
</TABLE>





P.A. No. 1810                              ii
                                                                            SA-4

<PAGE>   84



                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                                 SA
                                                                                             Number
                                                                                             ------
<S>                                                                                          <C>
RESTRICTED LETTER AGREEMENTS
- ----------------------------


6-1162-RLL-932                 Promotional Support

6-1162-RLL-933R4               Option Aircraft                                               SA-4

6-1162-RLL-934R1               Disclosure of Confidential                                    SA-1
                               Information

6-1162-RLL-935R1               Performance Guarantees                                        SA-1

6-1162-RLL-936R4               Certain Contractual Matters                                   SA-4

6-1162-RLL-937                 Alternate Advance Payment Schedule

6-1162-RLL-938                 ***

6-1162-RLL-939R1               Certification Flight Test Aircraft                            SA-1

6-1162-RLL-940R1               Training Matters                                              SA-1

6-1162-RLL-941R1               Other Matters                                                 SA-1

6-1162-RLL-942                 Open Configuration Matters

6-1162-RLL-943                 Substitution Rights

6-1162-RLL-944                 Airframe Maintenance Material Cost
                               Protection Program

6-1162-RLL-945                 Comparison of 737-7H4 and 737-3H4
                               Block Fuel Burn

6-1162-RLL-1855R3              Additional Contractual Matters                                SA-4

6-1162-RLL-1856                ***                                                           SA-1

6-1162-RLL-1857                Service Ready Validation Program                              SA-1
                               Field Test

6-1162-RLL-1858R1              Escalation Matters                                            SA-4
</TABLE>




P.A. No. 1810                             iii
                                                                            SA-4

<PAGE>   85



                             TABLE OF CONTENTS CON'T

<TABLE>
<CAPTION>
                                                                                                 SA
                                                                                             Number
                                                                                             ------
<S>                                                                                          <C>
RESTRICTED LETTER AGREEMENTS
- ----------------------------


6-1162-RLL-2036                Amortization of Costs for
                               Customer Unique Changes                                       SA-1

6-1162-RLL-2037                Reconciliation of the Aircraft                                SA-1
                               Basic Price

6-1162-RLL-2073                Maintenance Training Matters                                  SA-1
</TABLE>





P.A. No. 1810                             iv
                                                                            SA-4
<PAGE>   86








                           PURCHASE AGREEMENT NO. 1810

                                   Relating to

                          BOEING MODEL 737-7H4 AIRCRAFT




         This Agreement is entered into as of January 19th 1994, by and between
The Boeing Company, a Delaware corporation, with its principal office in
Seattle, Washington (Boeing), and Southwest Airlines Co., a Texas corporation,
with its principal office in the City of Dallas, State of Texas (Buyer).


Accordingly, Boeing and Buyer agree as follows:





P.A. No. 1810                              1
<PAGE>   87





ARTICLE 1.        Subject Matter of Sale.

         1.1      The Aircraft. Subject to the terms and conditions of this
Agreement, Boeing will manufacture and deliver to Buyer and Buyer will purchase
and accept delivery from Boeing of one hundred twenty-nine (129) Boeing Model
737-7H4 aircraft (the Aircraft) manufactured in accordance with Boeing Detail
Specification D6-38808-1, dated October 30, 1996, as described in Exhibit A, as
modified from time to time in accordance with this Agreement (Detail
Specification).

         1.2      Additional Goods and Services. In connection with the sale of
the Aircraft, Boeing will also provide to Buyer certain other things under this
Agreement, including data, documents, training and services, all as described in
this Agreement.

         1.3      Performance Guarantees. Any performance guarantees applicable
to the Aircraft will be expressly included in this Agreement. Where performance
guarantees are included in this Agreement other than within the Detail
Specification, such guarantees will be treated as being incorporated in the
Detail Specification by this reference.

         1.4      Defined Terms. For ease of use, certain terms are treated as
defined terms in this Agreement. Such terms are identified with a capital letter
and set forth and/or defined in Exhibit F.



P.A. No. 1810                             1-1
                                                                            SA-4
<PAGE>   88





ARTICLE 2.        Delivery, Title and Risk of Loss.

         2.1      Time of Delivery. The Aircraft will be delivered to Buyer by
Boeing, assembled and ready for flight and Buyer will accept delivery of the
Aircraft, in accordance with the following schedule:

<TABLE>
<CAPTION>
             Month and Year
               of Delivery                           Quantity of Aircraft
             --------------                          --------------------
             <S>                   <C>                        <C>
                                   Block A Aircraft
                                   ----------------

             October 1997                                     Two (2)
             November 1997                                    Two (2)

                                   Block B Aircraft
                                   ----------------

             January 1998                                     Two (2)
             February 1998                                    Three (3)
             March 1998                                       Two (2)
             April 1998                                       Two (2)
             May 1998                                         Two (2)
             June 1998                                        One (1)
             July 1998                                        Two (2)
             September 1998                                   Two (2)

                                   Block C Aircraft
                                   ----------------

             February 1999                                    Four (4)
             May 1999                                         Four (4)
             July 1999                                        Four (4)
             September 1999                                   Four (4)

                                   Block D Aircraft
                                   ----------------

             January 2000                                     Four (4)
             March 2000                                       Four (4)
             July 2000                                        Four (4)
             September 2000                                   Three (3)

                                   Block E Aircraft
                                   ----------------

             January 2001                                     Three (3)
             March 2001                                       Three (3)
             July 2001                                        Three (3)
             September 2001                                   Three (3)

                                   Block F Aircraft
                                   ----------------

             October 1998                                     One (1)
             November 1998                                    Two (2)
             December 1998                                    Two (2)
</TABLE>




P.A. No. 1810                             2-1
                                                                            SA-4
<PAGE>   89

<TABLE>
             <S>                   <C>                        <C>
                                   Block G Aircraft
                                   ----------------

             March 1999                                       Two (2)

                                   Block H Aircraft
                                   ----------------

             June 1999                                        Two (2)
             August 1999                                      Two (2)
             September 1999                                   One (1)
             October 1999                                     Two (2)
             April 2000                                       Three (3)
             October 2000                                     Three (3)
             April 2001                                       Three (3)
             October 2001                                     Three (3)

                                   Block I Aircraft
                                   ----------------

             January 2002                                     Four (4)
             March 2002                                       Four (4)
             April 2002                                       Two (2)
             July 2002                                        Four (4)
             October 2002                                     Four (4)

                                   Block J Aircraft
                                   ----------------

             January 2003                                     Four (4)
             March 2003                                       One (1)

                                   Block K Aircraft
                                   ----------------

             April 2004                                       Two (2)
             July 2004                                        Three (3)

                                   Block L Aircraft
                                   ----------------

             November 2000                                    One (1)
             December 2000                                    One (1)
             July 2001                                        One (1)
             September 2001                                   One (1)
             October 2001                                     One (1)
             September 2002                                   Three (3)
             September 2003                                   Three (3)
             March 2004                                       One (1)
</TABLE>

         2.2      Notice of Target Delivery Date. Boeing will give Buyer notice
of the Target Delivery Date of the Aircraft approximately 30 days prior to the
scheduled month of delivery.

         2.3      Notice of Delivery Date. If Boeing gives Buyer at least 7
days' notice of the delivery date of the Aircraft, and an Aircraft delivery is
delayed beyond such delivery date due to the responsibility of Buyer, Buyer will



P.A. No. 1810                             2-2
                                                                            SA-4
<PAGE>   90

reimburse Boeing for all costs incurred by Boeing as a result of such delay,
including amounts for storage, insurance, Taxes, preservation or protection of
the Aircraft and interest on payments due.

         2.4      Place of Delivery. The Aircraft will be delivered at an
airport facility selected by Boeing in the State of Washington, unless mutually
agreed otherwise.

         2.5      Title and Risk of Loss. Title to and risk of loss of an
Aircraft will pass from Boeing to Buyer upon delivery of such Aircraft, but not
prior thereto.

         2.6      Bill of Sale. Upon delivery of an Aircraft Boeing will deliver
to Buyer a bill of sale conveying good title to such Aircraft, free of all
liens, claims, charges and encumbrances of every kind whatsoever, and such other
appropriate documents of title as Buyer may reasonably request.




P.A. No. 1810                             2-3
                                                                            SA-4
<PAGE>   91

ARTICLE 3.        Price of Aircraft.

       3.1        Definitions.

                  3.1.1  Special Features are the features incorporated in
Exhibit A which have been selected by Buyer.

                  3.1.2  Base Aircraft Price is the Aircraft Basic Price
excluding the price of Special Features.

                  3.1.3  Aircraft Basic Price is comprised of the Base
Aircraft Price and the price of the Special Features.

                  3.1.4  Economic Price Adjustment is the adjustment to the
Aircraft Basic Price (Base Aircraft and Special Features) as calculated pursuant
to Exhibit D.

                  3.1.5  Aircraft Price is the total amount Buyer is to pay
for the Aircraft at the time of delivery.

       3.2        Aircraft Basic Price.

                  The Aircraft Basic Price, expressed in July 1992 dollars, is
set forth below:

<TABLE>
<CAPTION>
                                Base                           Special                    Aircraft
                                Aircraft Price                 Features                   Basic Price
                                --------------                 --------                   -----------
<S>                             <C>                            <C>                        <C>
Block A, B, C,
D & E Aircraft                      ***                          ***                         ***
Block F & G
Aircraft                            ***                          ***                         ***
Block H
Aircraft                            ***                          ***                         ***
Block I
Aircraft                            ***                          ***                         ***
Block J
Aircraft                            ***                          ***                         ***
Block K
Aircraft                            ***                          ***                         ***
Block L
Aircraft                            ***                          ***                         ***
</TABLE>


       3.3        Aircraft Price. The Aircraft Price will be established at the 
time of delivery of such Aircraft to Buyer and will be the sum of:

                  3.3.1  the Aircraft Basic Price, which is *** for the Block A,
B, C, D and E Aircraft, *** for the Block F and G Aircraft, *** for the Block H
Aircraft, *** for the 





P.A. No. 1810                            15-1
<PAGE>   92






Block I Aircraft, *** for the Block J Aircraft, *** for the Block K Aircraft and
*** for the Block L Aircraft; plus

                  3.3.2  the Economic Price Adjustments for the Aircraft Basic
Price, as calculated pursuant to the formulas set forth in Exhibit D (Price
Adjustments Due to Economic Fluctuations - Aircraft); plus

                  3.3.3  other price adjustments made pursuant to this Agreement
or other written agreements executed by Boeing and Buyer.

       3.4        Advance Payment Base Price.

                  3.4.1  Advance Payment Base Price. For advance payment
purposes, the following estimated delivery prices of the Aircraft (Advance
Payment Base Price) have been established, using currently available forecasts
of the escalation factors used by Boeing as of the date of signing this
Agreement. The Advance Payment Base Price of each Aircraft is set forth below:

<TABLE>
<CAPTION>
             Month and Year of                                Advance Payment Base
             Scheduled Delivery                               Price per Aircraft
             ------------------                               ------------------
             <S>                   <C>                        <C>
                                   Block A Aircraft ***
                                   --------------------


             October 1997
             November 1997

                                   Block B Aircraft ***
                                   --------------------

             January 1998 
             February 1998 
             March 1998 
             April 1998 
             May 1998 
             June 1998
             July 1998 
             September 1998

                                   Block C Aircraft ***
                                   --------------------

             February 1999
             May 1999
             July 1999
             September 1999
</TABLE>



P.A. No. 1810                            15-2

<PAGE>   93




<TABLE>
             <S>                   <C>                        
                                   Block D Aircraft ***
                                   --------------------

             January 2000
             March 2000
             July 2000
             September 2000

                                   Block E Aircraft ***
                                   --------------------

             January 2001
             March 2001
             July 2001
             September 2001

                                   Block F Aircraft ***
                                   --------------------

             October 1998
             November 1998
             December 1998

                                   Block G Aircraft ***
                                   --------------------

             March 1999

                                   Block H Aircraft ***
                                   --------------------

             June 1999 
             August 1999 
             September 1999 
             October 1999 
             April 2000
             October 2000 
             April 2001 
             October 2001

                                   Block I Aircraft ***
                                   --------------------

             January 2002
             March 2002
             April 2002
             July 2002
             October 2002

                                   Block J Aircraft ***
                                   --------------------

             January 2003
             March 2003

                                   Block K Aircraft ***
                                   --------------------

             April 2004
             July 2004
</TABLE>




P.A. No. 1810                            15-3
<PAGE>   94

<TABLE>
             <S>                   <C>                        
                                   Block L Aircraft ***
                                   --------------------

             November 2000 
             December 2000 
             July 2001 
             September 2001 
             October 2001
             September 2002 
             September 2003 
             March 2004
</TABLE>

                  3.4.2  Adjustment of Advance Payment Base Prices - Long-Lead
Aircraft. For Aircraft scheduled for delivery 36 months or more after the date
of this Agreement, the Advance Payment Base Prices appearing in Article 3.4.1
will be used to determine the amount of the first advance payment to be made by
Buyer on the Aircraft. No later than 25 months before the scheduled month of
delivery of each affected Aircraft, Boeing will increase or decrease the Advance
Payment Base Price of such Aircraft as required to reflect the effects of (i)
any adjustments in the Aircraft Basic Price pursuant to this Agreement and (ii)
the then-current forecasted escalation factors used by Boeing. Boeing will
provide the adjusted Advance Payment Base Prices for each affected Aircraft to
Buyer, and the advance payment schedule will be considered amended to substitute
such adjusted Advance Payment Base Prices.






P.A. No. 1810                            15-4
<PAGE>   95
6-1162-RLL-933R4

Southwest Airlines Co.
P.O. Box 36611 - Love Field
Dallas, Texas  75235

Subject:     Letter Agreement No. 6-1162-RLL-933R4 to 
             Purchase Agreement No. 1810 -
             Option Aircraft


This Letter Agreement amends Purchase Agreement No. 1810 dated as of January 19,
1994 (the Agreement) between The Boeing Company (Boeing) and Southwest Airlines
Co. (Buyer) relating to Model 737-7H4 aircraft (Aircraft).

All terms used and not defined herein will have the same meaning as in the
Agreement.

In consideration of the purchase by Buyer of the Aircraft, Boeing hereby agrees
to manufacture and sell to Buyer sixty-two (62) additional Model 737-7H4
aircraft as described in paragraph 1 of Attachment A hereto (Option Aircraft)
and fifty-nine (59) Model 737-7H4 Rollover Option Aircraft (Rollover Option
Aircraft), subject to the terms and conditions set forth below.

1.       Delivery of Option Aircraft.

         The Option Aircraft will be delivered to Buyer during or before the
months set forth in the following schedule:
<TABLE>
<CAPTION>

                                                     Number of                Option
             Month and Year                          Option                   Aircraft
             of Delivery                             Aircraft                 Block
             -----------                             --------                 --------
             <S>                                     <C>                      <C>   

             March 2003                              Three  (3)                    M
             April 2003                              Two   (2)                     M
             July 2003                               Four  (4)                     M
             October 2003                            Four  (4)                     M
             January 2004                            Four (4)                      N
             March 2004                              One (1)                       N
             April 2004                              One   (1)                     N
             August 2004                             Two   (2)                     N
             September 2004                          Three (3)                     N
             October 2004                            Two   (2)                     N
</TABLE>

P.A. No. 1810
                                                                           SA-4
<PAGE>   96
Soutwest Airlines Co.
6-1162-RLL-933R4    Page 2

<TABLE>
<CAPTION>


                                                     Number of                Option
             Month and Year                          Option                   Aircraft
             of Delivery                             Aircraft                 Block
             --------------                          ---------                --------
<S>                                                  <C>                      <C>     
             January 2005                            Four (4)                    O
             March 2005                              Four (4)                    O
             April 2005                              Two (2)                     O
             July 2005                               Four (4)                    O
             October 2005                            Four (4)                    O
             January 2006                            Four (4)                    P
             March 2006                              Four (4)                    P
             April 2006                              Two (2)                     P
             July 2006                               Four (4)                    P
             October 2006                            Four (4)                    P
</TABLE>

2.       Delivery of Rollover Option Aircraft.

         2.1 The Rollover Option Aircraft will be delivered to Buyer during or
before the years set forth in the following schedule:
<TABLE>
<CAPTION>

                                                                              Option
             Year of                   Number of                              Aircraft
             Delivery                  Option Aircraft                        Block
             --------                  --------------                         -------- 
             <S>                       <C>                                     <C>     
             2007                      Twenty (20)                                 Q
             2008                      Twenty (20)                                 R
             2009                      Nineteen (19)                               S
</TABLE>

         2.2 The fifty-nine (59) Rollover Option Aircraft are offered to Buyer
subject to the following conditions:

                  2.2.1 Buyer can exercise any fifty-nine (59) of the sixty-two
(62) Option Aircraft, and will be offered a Rollover Option Aircraft for each
option aircraft exercised up to and including fifty-nine (59).

                  2.2.2 Conversely to Article 2.2.1 above, if Buyer does not
exercise a minimum of fifty-nine (59) Option Aircraft, one Rollover Option
Aircraft will be deleted for each Option Aircraft not exercised by Buyer.

                  2.2.3 When Buyer exercises one or more Option Aircraft, Boeing
will offer the same quantity of Rollover Option Aircraft to Buyer in the years
identified in Article 2.1 above.

                  2.2.4 The Rollover Option Aircraft delivery month offered by
Boeing to Buyer will be at 

P.A. No. 1810
                                                                           SA-4
<PAGE>   97
Soutwest Airlines Co.
6-1162-RLL-933R4    Page 3


least 24 months from the Option exercise date of the corresponding option.

                  2.2.5 When Boeing offers the Rollover Option Aircraft to
Buyer, Buyer will accept such Rollover Option Aircraft by wire transferring
$100,000 to Boeing. In the event Buyer exercises its option to purchase the
Rollover Option Aircraft, such application will be in accordance with Article
4.1 herein.

3.       Price.

         3.1 The advance payment base prices of the Option Aircraft set forth
below and in paragraph 2.1 of Attachment A represent the estimated delivery
prices of the Option Aircraft. The Option Aircraft pricing elements and
associated pricing terms and conditions are given in Attachment A.

         3.2 Price and escalation provisions for Model 737-7H4 aircraft
delivering after 2002, are not currently available. The estimated Advance
Payment Base Prices shown in paragraph 3.3 below and in paragraph 2.1 of
Attachment A are based on currently available price and escalation provisions.
As price and escalation provisions become available for Model 737-7H4 aircraft
delivering after 2002, such price and escalation provisions will be
appropriately applied to the applicable Option Aircraft.

For additional information relating to price and escalation provisions
applicable to Option Aircraft delivering after 2002 refer to paragraphs 2.3 and
3.2 of Attachment A.

         3.3 The Advance Payment Base Prices of the Option Aircraft indicated
below do include an amount for special features in addition to those
specifically described in Attachment A but do not include any amount for items
of Buyer Furnished Equipment (BFE). An estimate for typical special features is
$*** per Aircraft (expressed in 1992 STE dollars) and for BFE is $*** per
Aircraft (expressed in delivery year dollars).

             Month and Year                              Advance Payment Base
             of Delivery                               Price per Option Aircraft
             --------------                            -------------------------
                                  Block M Aircraft ***
                                  --------------------
             March 2003
             April 2003
             July 2003
             October 2003
P.A. No. 1810
                                                                           SA-4

<PAGE>   98
Southwest Airlines Co.
6-1162-RLL-933R4    Page 4




             Month and Year                  Advance Payment Base
             of Delivery                     Price per Option Aircraft
             --------------                  -------------------------
                         Block N Aircraft ***
                         --------------------
  
             January 2004 
             March 2004 
             April 2004 
             August 2004 
             September 2004
             October 2004

                         Block O Aircraft ***
                         --------------------

             January 2005
             March 2005
             April 2005
             July 2005
             October 2005

                         Block P Aircraft ***
                         --------------------

             January 2006
             March 2006
             April 2006
             July 2006
             October 2006

         3.4 The Option Aircraft purchase price will be the applicable basic
price thereof at the time of Option Aircraft delivery adjusted in accordance
with Boeing's Aircraft escalation provisions contained in the definitive
agreement to purchase the Option Aircraft. The purchase price will include the
price for Seller Purchased Equipment (SPE) if Buyer has elected to change Buyer
Furnished Equipment (BFE) to SPE.

4.       Option Aircraft Payment.

         4.1 In consideration of the granting of the option as set forth herein,
on or before the date Boeing and Buyer enter into a definitive agreement to
purchase the Aircraft, Buyer will pay a deposit to Boeing of $100,000 for each
Option Aircraft (Deposit). In the event Buyer exercises its option herein, the
amount of the Deposit will be credited against the first advance payment due for
such Option Aircraft pursuant to the advance payment schedule set forth in
paragraph 3 of Attachment A. The Deposits for the Option Aircraft will be
refunded to Buyer, without 



P.A. No. 1810
                                                                           SA-4
<PAGE>   99
Southwest Airlines Co.
6-1162-RLL-933R4    Page 5

interest, if the parties do not enter into a definitive Agreement for the
Aircraft.

In the event that, after the parties enter into a definitive agreement to
purchase the Aircraft, Buyer does not exercise its option to purchase the Option
Aircraft pursuant to the terms and conditions set forth herein, Boeing will be
entitled to retain the Deposits for the Option Aircraft except as provided in
paragraphs 6 herein.

         4.2 Advance payments in the amount of 30% of the advance payment base
price will be payable on the Option Aircraft in accordance with paragraph 3 of
Attachment A. The remainder of the Option Aircraft purchase price is due at the
time of delivery of the Option Aircraft.

5.       Option Exercise.

         5.1 To exercise its Option, Buyer will give written or telegraphic
notice thereof to Boeing on or before eighteen (18) months prior to the first
day of the delivery month of each Option Aircraft.

In such notice Buyer will select the Option Model type, and the applicable
delivery positions.

         5.2 It is understood and agreed that Boeing may accelerate the option
exercise dates specified above if Boeing must make production decisions which
are dependent on Buyer's decision to buy the Option Aircraft. If Boeing elects
to accelerate the option exercise dates, Boeing will do so by giving written or
telegraphic notice thereof to Buyer. Such notice will specify the revised option
exercise dates, which will not be earlier than 30 days after the date of
transmittal of such notice, and the Option Aircraft delivery positions affected
by such revision. If Buyer fails to exercise its option for any Option Aircraft
affected by such revised dates, the Deposit applicable to such Option Aircraft
will be promptly refunded, with interest, to Buyer. The interest rate for
calculation of the interest associated with such refund is the rate of two
percent (2%) below the Citibank base rate in effect from time to time during the
period the option deposit is held by Boeing.

6.       Contract Terms.

         It is understood that Boeing and Buyer will use their best efforts to
enter into a definitive agreement for the Option Aircraft within thirty (30)
days after 


P.A. No. 1810
                                                                           SA-4
<PAGE>   100
Southwest Airlines Co.
6-1162-RLL-933R4    Page 6



Buyer exercises an option to purchase Option Aircraft pursuant to paragraph 5
covering the detailed terms and conditions for the sale of such Option Aircraft.

Such definitive agreement will include the terms and conditions contained herein
together with the terms and conditions, not inconsistent herewith, contained in
Boeing's then-current standard form of purchase agreement for the sale of Model
737-700 aircraft in effect as of the date of option exercise and such additional
terms and conditions as may be mutually agreed upon. In the event the parties
have not entered into such an agreement within the time period contemplated
herein, either party may, exercisable by written or telegraphic notice given to
the other within thirty (30) days after such period, terminate the purchase of
such Option Aircraft.

7.       Termination of Option to Purchase.

         Either Boeing or Buyer may terminate the option to purchase an Option
Aircraft if any of the following events are not accomplished by the respective
dates contemplated in this letter agreement, or in the Agreement, as the case
may be:

         (i)  termination of the purchase of the Aircraft under the Agreement 
for any reason;

         (ii) payment by Buyer of the Deposit with respect to an Option Aircraft
pursuant to paragraph 4.1 herein;

         (iii) exercise of an option to purchase an Option Aircraft pursuant to
the terms hereof. Any termination of an option to purchase by Boeing which is
based on the termination of the purchase of Aircraft under the Agreement will be
on a one-for-one basis, for each Aircraft so terminated.

Any cancellation of an option to purchase which is based on failure to make the
required Deposit or to exercise the option to purchase shall only apply to the
Option Aircraft so canceled.

Termination of an option to purchase provided by this letter agreement will be
caused by either party giving written notice to the other within 10 days after
the applicable date. Upon receipt of such notice, all rights and obligations of
the parties with respect to an Option Aircraft for which the option to purchase
has been terminate will thereupon terminate.


P.A. No. 1810
                                                                           SA-4
<PAGE>   101

Soutwest Airlines Co.
6-1162-RLL-933R4    Page 7



If termination is result of a revision of an option exercise date by Boeing
pursuant to paragraph 5.2, Boeing will promptly refund to Buyer, without
interest, any payments received from Buyer, including the Deposit, with respect
to the Option Aircraft for which the option is terminated. If termination is for
any other reason, Boeing will promptly refund to Buyer, without interest, any
payments received from Buyer with respect to the affected Option Aircraft,
except the Deposit, which Buyer may apply to any model Boeing aircraft purchased
by Buyer from Boeing at a future date.

8. Confidential Treatment. Buyer understands that certain commercial and
financial information contained in this Letter Agreement including any
attachments hereto is considered by Boeing as confidential. Buyer agrees that it
will treat this Letter Agreement and the information contained herein as
confidential and will not, without the prior written consent of Boeing, disclose
this Letter Agreement or any information contained herein to any other person or
entity except as provided in Letter Agreement No. 6-1162-RLL-934R1.

Very truly yours,

THE BOEING COMPANY



By  /s/ Dawn S. Foster
   ----------------------------
Its  Attorney-in-Fact
   ----------------------------

ACCEPTED AND AGREED TO this

date:  December 19, 1997

SOUTHWEST AIRLINES CO.



By  /s/ Gary A. Barron
  -----------------------------
Its  Executive VP & COO
   ----------------------------
Attachments


P.A. No. 1810
                                                                           SA-4
<PAGE>   102


Attachment A to
6-1162-RLL-933R4
Page 1




Model 737-7H4 Aircraft
- ----------------------
1.       Option Aircraft Description and Changes.

         1.1      Aircraft Description.  The Option Aircraft is described by 
Boeing Detail Specification D6-38808-1, Dated October 30 ,1996.

         1.2      Changes.  The Detail Specification will be revised to include:

                  (1) Changes applicable to the basic Model 737-700 aircraft
which are developed by Boeing between the date of the Detail Specification and
the signing of a definitive agreement to purchase the Option Aircraft.

                  (2) Changes mutually agreed upon.

                  (3) Changes required to obtain a Standard Certificate of
Airworthiness.

                  (4) To provide sufficient Option Aircraft manufacturing and
procurement lead time it is necessary for Boeing and Buyer to reach final
agreement on the Option Aircraft configuration, including BFE/SPE vendor
selection fifteen (15) months prior to delivery of each Option Aircraft. If such
items are not resolved by the indicated dates, Boeing reserves the right to
amend this letter agreement:

                           (i)      to adjust the scheduled delivery of the 
Option Aircraft to a later time period and,

                           (ii)     to make such other changes as are 
appropriate and consistent with the revised Option Aircraft deliveries.

         1.3 Effect of Changes. Changes to the Detail Specification incorporated
pursuant to the provisions of the clauses above will include the effects of such
changes upon Option Aircraft weight, balance, design and performance.
Performance guarantees for the Option Aircraft which are mutually acceptable to
the parties will be included in the definitive agreement for the Option
Aircraft.



P.A. No. 1810
                                                                           SA-4
<PAGE>   103



Attachment A to
6-1162-RLL-933R4
Page 2






2.       Price Description
         -----------------

         2.1      Price Elements Per Aircraft
                  ---------------------------


                           1                  2               3
                           -                  -               -

                       AIRCRAFT &                                      ADV. PMT.
AIRCRAFT            ESTIMATED SPECIAL                      ESTIMATED  BASE PRICE
DELIVERY             FEATURES PRICE        ESTIMATED      ESCALATION  (ELEMENTS)
MO. & YR.             (JULY 1992$)        ESCALATION       SHARING     1 + 2 + 3
- ---------           -----------------     ----------      ----------  ----------

BLOCK M
- -------

March 2003                 ***                ***             ***          ***
April 2003                 ***                ***             ***          ***
July 2003                  ***                ***             ***          ***
October 2003               ***                ***             ***          ***

BLOCK N
- -------

January 2004               ***                ***             ***          ***
March 2004                 ***                ***             ***          ***
April 2004                 ***                ***             ***          ***
August 2004                ***                ***             ***          ***
September 2004             ***                ***             ***          ***
October 2004               ***                ***             ***          ***

BLOCK O
- -------

January 2005               ***                ***             ***          ***
March 2005                 ***                ***             ***          ***
April 2005                 ***                ***             ***          ***
July 2005                  ***                ***             ***          ***
October 2005               ***                ***             ***          ***

BLOCK P
- -------

January 2006               ***                ***             ***          ***
March 2006                 ***                ***             ***          ***
April 2006                 ***                ***             ***          ***
July 2006                  ***                ***             ***          ***
October 2006               ***                ***             ***          ***


Continued Next Page...


P.A. No. 1810
                                                                           SA-4
<PAGE>   104



Attachment A to
6-1162-RLL-933R4
Page 3



2.       Price Description. (Continued)
         ------------------
                  2.2 Price Adjustments For Option Aircraft Delivering From 
                  March 2003 through October 2006.

                  2.2.1 Special Features. The price for Special Features
incorporated in the Option Aircraft Detail Specification will be adjusted to
Boeing's then-current prices for such features as of the date of execution of
the definitive agreement for the Option Aircraft.

                  2.2.2 Escalation Adjustments. For escalation provisions
applicable to Option Aircraft delivering after 2002, see paragraph 2.3.6 below.

                  2.2.3 Base Price Adjustments for FAA Changes. The Aircraft
Basic Price of the Option Aircraft will be adjusted for any FAA mandated changes
incorporated into the Aircraft.

                  2.2.4 Price Adjustments for Changes. Boeing may adjust the
Aircraft Basic Price and the Advance Payment Base Price for any changes mutually
agreed upon subsequent to the date that Buyer and Boeing enter into a definitive
agreement for the Option Aircraft.

                  2.2.5 Base Price Adjustments. The Aircraft Basic Price of the
Option Aircraft will be adjusted to Boeing's then-current prices as of the date
of execution of the definitive agreement for the Option Aircraft in accordance
with the agreement reached below. The Aircraft Basic Price starting point for
options delivering in 2003 is $*** (July 1992 STE), for options delivering in
2004 is $*** (July 1992 STE), for options delivering in 2005 and 2006 is $***
(July 1992 STE). Such Aircraft Basic Price may increase in accordance with
paragraphs 2.2.1, 2.2.2, 2.2.3 and 2.2.4. For any other changes to the Aircraft
Basic Price, Boeing may increase the Aircraft Basic Price by a maximum of $***
(July 1992 STE) per year or portion thereof starting in March 2003.

                  2.2.6 Prices for Long Lead Time Aircraft. Boeing has not
established escalation provisions for Model 737-700 aircraft for delivery 2003
and after. Such escalation provisions (i) will be incorporated into the Option
Aircraft definitive agreement when such information is available and (ii) will
be the then-current escalation provisions applicable to the same model aircraft
and engines delivering in the same time period as the Option Aircraft. The
resulting revisions to the definitive agreement will include but not be limited
to, adjustment of the Aircraft 


P.A. No. 1810
                                                                           SA-4

<PAGE>   105
Attachment A to
6-1162-RLL-933R4
Page 4



Basic Price of the Option Aircraft, the Advance Payment Base Price, the Aircraft
escalation provisions and the advance payment amounts due on the Option
Aircraft.

                  2.2.7 BFE to SPE. An estimate of the total price for items of
Buyer Furnished Equipment (BFE) changed to Seller Purchased Equipment (SPE)
pursuant to the Configuration Specification is included in the Option Aircraft
price build-up. The purchase price of the Option Aircraft will be adjusted by
the price charged to Boeing for such items plus 10% of such price. If all BFE
except developmental avionics is converted to SPE, Boeing will waive the 10%
fee.

3.       Advance Payment Schedules, Prices and Adjustments.
         -------------------------------------------------

         3.1 Buyer will pay to Boeing advance payments for the Option Aircraft
on the dates and in the amounts determined below.
<TABLE>
<CAPTION>


                                                                 Amount Due per Aircraft
                                                                 -----------------------
                                                                    (Percentage times
Due Date of Payment                                            Advance Payment Base Price)
- -------------------             

<S>                                                            <C>                     
Deposit                                                              $100,000 (if applicable)

18 months prior to the first                                         15% (less the
day of the scheduled delivery                                             Deposit if any)
month of the Aircraft

12 months prior to the first                                         5%
day of the scheduled delivery
month of the Aircraft

9 months prior to the first                                          5%
day of the scheduled delivery
month of the Aircraft

6 months prior to the first                                          5%
day of the scheduled delivery
month of the Aircraft
                                                                    ----
                    Total                                           30%
</TABLE>

Any advance payments that would be past due as of the date of signing the
definitive purchase agreement for the Option Aircraft in accordance with the
above schedule are due and payable on such date.


P.A. No. 1810
                                                                           SA-4
<PAGE>   106

Attachment A to
6-1162-RLL-933R4
Page 5



         3.2 Option Aircraft advance payment base prices will be increased or
decreased, as appropriate, at the time of signing of the definitive purchase
agreement for the Option Aircraft, using the then-current forecasted aircraft
escalation factors used by Boeing, to determine the amount of the advance
payments to be made by Buyer on the Option Aircraft.



P.A. No. 1810
                                                                            SA-4
<PAGE>   107

Attachment B to
6-1162-RLL-933R4
Page 1


                             PRICE ADJUSTMENT DUE TO
                              ECONOMIC FLUCTUATIONS
                            AIRCRAFT PRICE ADJUSTMENT
                             (July 1992 Base Price)


1.       Formula.

         The Aircraft Price Adjustment will be determined at the time of
Aircraft delivery in accordance with the following formula:

         Pa = (P)(L + M - 1)

         Where:

             Pa = Aircraft Price Adjustment.

             L =      .65 x  ECI
                             ---
                            116.2

             M =      .35 x  ICI
                             ---
                            115.9

             P = Aircraft Basic Price (as set forth in Article 3.2 of this
                 Agreement).

           ECI = A value using the "Employment Cost Index for workers in 
                 aerospace manufacturing" (aircraft manufacturing, standard
                 industrial classification code 3721, compensation, base month 
                 and year June 1989 = 100), as released by the Bureau of Labor
                 Statistics, U.S. Department of Labor on a quarterly basis for
                 the months of March, June, September and December, calculated 
                 as follows: A three-month arithmetic average value (expressed 
                 as a decimal and rounded to the nearest tenth) will be 
                 determined using the months set forth in the table below for 
                 the applicable Aircraft, with the released Employment Cost 
                 Index value described above for the month of March also being
                 used for the months of January and February; the value for June
                 also used for April and May; the value for September also used
                 for July and August; and the value for December also used for
                 October and November.


P.A. No. 1810
                                                                            SA-4
<PAGE>   108
Attachment B to
6-1162-RLL-933R4
Page 2



     ICI       = The three-month arithmetic average of the released monthly 
                 values for the Industrial Commodities Index as set forth in the
                 "Producer Prices and Price Index" (Base Year 1982 = 100) as
                 released by the Bureau of Labor Statistics, U.S. Department of
                 Labor values (expressed as a decimal and rounded to the nearest
                 tenth) for the months set forth in the table below for the
                 applicable Aircraft.

         In determining the value of L, the ratio of ECI divided by 116.2 will
be expressed as a decimal rounded to the nearest ten-thousandth and then
multiplied by .65 with the resulting value also expressed as a decimal and
rounded to the nearest ten-thousandth.

         In determining the value of M, the ratio of ICI divided by 115.9 will
be expressed as a decimal rounded to the nearest ten-thousandth and then
multiplied by .35 with the resulting value also expressed as a decimal and
rounded to the nearest ten-thousandth.
<TABLE>
<CAPTION>

                                Months to be Utilized
Month of Scheduled              in Determining the
Aircraft Delivery               Value of ECI and ICI
- ------------------              ---------------------
<S>                             <C>
January                         June  B, July  B, Aug.  B
February                        July  B, Aug.  B, Sept. B
March                           Aug.  B, Sept. B, Oct.  B
April                           Sept. B, Oct.  B, Nov.  B
May                             Oct.  B, Nov.  B, Dec.  B
June                            Nov.  B, Dec.  B, Jan.  D
July                            Dec.  B, Jan.  D, Feb.  D
August                          Jan.  D, Feb.  D, Mar.  D
September                       Feb.  D, Mar.  D, Apr.  D
October                         Mar.  D, Apr.  D, May   D
November                        Apr.  D, May   D, June  D
December                        May   D, June  D, July  D

</TABLE>

The following definitions of B and D will apply:

                  B    = The calendar year before the year in which the
                         scheduled month of delivery as set forth in Paragraph 1
                         occurs.

                  D    = The calendar year during which the scheduled month of
                         delivery as set forth in Paragraph 1 occurs.


P.A. No. 1810
                                                                            SA-4
<PAGE>   109

Attachment B to
6-1162-RLL-933R4
Page 3


2. If at the time of delivery of an Aircraft Boeing is unable to determine the
Aircraft Price Adjustment because the applicable values to be used to determine
the ECI and ICI have not been released by the Bureau of Labor Statistics, then:

         2.1 The Aircraft Price Adjustment, to be used at the time of delivery
of each of the Aircraft, will be determined by utilizing the escalation
provisions set forth above. The values released by the Bureau of Labor
Statistics and available to Boeing 30 days prior to scheduled Aircraft delivery
will be used to determine the ECI and ICI values for the applicable months
(including those noted as preliminary by the Bureau of Labor Statistics) to
calculate the Aircraft Price Adjustment. If no values have been released for an
applicable month, the provisions set forth in Paragraph 2.2 below will apply. If
prior to delivery of an Aircraft the U.S. Department of Labor changes the base
year for determination of the ECI or ICI values as defined above, such rebased
values will be incorporated in the Aircraft Price Adjustment calculation. The
payment by Buyer to Boeing of the amount of the Purchase Price for such
Aircraft, as determined at the time of Aircraft delivery, will be deemed to be
the payment for such Aircraft required at the delivery thereof.

         2.2 If prior to delivery of an Aircraft the U.S. Department of Labor
substantially revises the methodology used for the determination of the values
to be used to determine the ECI and ICI values (in contrast to benchmark
adjustments or other corrections of previously released values), or for any
reason has not released values needed to determine the applicable Aircraft Price
Adjustment, the parties will, prior to delivery of any such Aircraft, select a
substitute for such values from data published by the Bureau of Labor Statistics
or other similar data reported by non-governmental United States organizations,
such substitute to lead in application to the same adjustment result, insofar as
possible, as would have been achieved by continuing the use of the original
values as they may have fluctuated during the applicable time period.
Appropriate revision of the formula will be made as required to reflect any
substitute values. However, if within 24 months from delivery of the Aircraft
the Bureau of Labor Statistics should resume releasing values for the months
needed to determine the Aircraft Price Adjustment, such values will be used to
determine any increase or decrease in the Aircraft Price Adjustment for the
Aircraft from that determined at the time of delivery of such Aircraft.


P.A. No. 1810
                                                                           SA-4
<PAGE>   110

Attachment B to
6-1162-RLL-933R4
Page 4



         2.3 In the event escalation provisions are made non-enforceable or
otherwise rendered null and void by any agency of the United States Government,
the parties agree, to the extent they may lawfully do so, to equitably adjust
the Purchase Price of any affected Aircraft to reflect an allowance for
increases or decreases in labor compensation and material costs occurring since
February, 1992, which is consistent with the applicable provisions of paragraph
1 of this Exhibit D.

3. For the calculations herein, the values released by the Bureau of Labor
Statistics and available to Boeing 30 days prior to scheduled Aircraft delivery
will be used to determine the ECI and ICI values for the applicable months
(including those noted as preliminary by the Bureau of Labor Statistics) to
calculate the Aircraft Price Adjustment.

Note:        Any rounding of a number, as required under this Exhibit D with
             respect to escalation of the airframe price, will be accomplished
             as follows: if the first digit of the portion to be dropped from
             the number to be rounded is five or greater, the preceding digit
             will be raised to the next higher number.




P.A. No. 1810
                                                                           SA-4

<PAGE>   111



6-1162-RLL-936R4


Southwest Airlines Co.
P.O. Box 36611 - Love Field
Dallas, Texas  75235

Subject:         Letter Agreement No. 6-1162-RLL-936R4 to
                 Purchase Agreement No. 1810 -
                 Certain Contractual Matters


This Letter Agreement amends Purchase Agreement No. 1810 dated January 19, 1994
(the Agreement) between The Boeing Company (Boeing) and Southwest Airlines Co.
(Buyer) relating to Model 737-7H4 aircraft (the Aircraft) and Letter Agreement
6-1162-RLL-933R4, dated even date herewith, entitled "Option Aircraft",
relating to the sale by Boeing and the purchase by Buyer of sixty-two (62)
additional Model 737-7H4 aircraft (the Option Aircraft) and fifty-nine (59)
Model 737-7H4 Rollover Option Aircraft (Rollover Option Aircraft).

The commitments made herein to Buyer are provided from Boeing and CFM
International Inc. (CFM).

All terms used herein and in the Agreement, and not defined herein, will have
the same meaning as in the Agreement.

1.       Credit Memorandum - Aircraft - Firm Aircraft.

         In consideration of Buyer's purchase of the Aircraft, Boeing will
issue to Buyer at the time of delivery of each Aircraft a credit memorandum
which may be used by Buyer for the purchase of Boeing goods and services or
applied to the final delivery payment for the Aircraft for which the credit was
issued.  The amount of this credit memorandum applicable to each Block A, B, C,
D and E Aircraft will be *** of the Aircraft Basic Price (July 1992 STE $) ***.
The amount of this credit memorandum applicable to each Block F, G, H, I, J, K
and L Aircraft will be *** of the Aircraft Basic Price (July 1992 STE $) ***.

2.       Credit Memorandum - Aircraft - Option Aircraft and Rollover Option
         Aircraft.

         In consideration of Buyer's purchase of the Option Aircraft and
Rollover Option Aircraft, Boeing will issue to Buyer at the time of delivery of
each




P.A. No. 1810
                                                                            SA-4
<PAGE>   112
Southwest Airlines Co.
6-1162-RLL-936R4   Page 2



Option Aircraft and Rollover Option Aircraft a credit memorandum which may be
used by Buyer for the purchase of Boeing goods and services or applied to the
final delivery payment for the Option Aircraft or Rollover Option Aircraft for
which the credit was issued.  The amount of the credit memorandum applicable to
each Aircraft will be *** of the Aircraft Basic Price (July 1992 STE $) ***.

3.       Simulation Data Credits.

         If Buyer purchases one subsequent simulator data package for a price
of $*** dollars (July 1992 STE $), Boeing will issue offsetting credit
memoranda in amounts equal to Boeing's invoice price of such simulator data
concurrent with the issuance of such invoice.  If Buyer purchases one
concurrent simulator data package for a price of $***, Boeing will issue an
offsetting credit memorandum in an amount equal to Boeing's invoice price of
such simulator data package concurrent with the issuance of such invoice.
Buyer understands that the concurrent data package price of $*** (July 1992 STE
$) is valid only if the second simulator is manufactured by the same simulator
manufacturer as the subsequent simulator and the concurrent simulator is
ordered within eight years of the signing of the Agreement.

4.       Credits.

         The Aircraft Basic Price for Buyer's 737-7H4 Aircraft does not include
a price for Dual Flight Management Computer and Five Channel SELCAL.  These two
features will be installed in the Aircraft but deactivated.  If Buyer decides
at anytime (whether before or after delivery) to activate this capability,
Buyer will pay Boeing an amount equal to *** (July 1992 STE $) *** for this
installed capability.  If Buyer sells or leases the Aircraft for operation by a
third party and the features are subsequently activated, Buyer will pay or
cause the subsequent buyer or lessee to pay the above described activation
charge to Boeing.

5.       Maximum Takeoff Weight Credit Memoranda.

         Buyer has purchased a Maximum Takeoff Weight of 138,500 pounds for the
Aircraft.  Boeing will, at the time of Aircraft delivery, issue to Buyer a
credit memoranda in the amount of $*** (July 1992 STE $), *** to offset the
price for 500 pounds of Maximum Takeoff Weight.





P.A. No. 1810
                                                                            SA-4
<PAGE>   113
Southwest Airlines Co.
6-1162-RLL-936R4   Page 3



6.       Confidential Treatment.

         Buyer understands that certain commercial and financial information
contained in this Letter Agreement is considered by Boeing as confidential.
Buyer agrees that it will treat this Letter Agreement and the information
contained herein as confidential and will not, without the prior written
consent of Boeing, disclose this Letter Agreement or any information contained
herein to any other person or entity, except as provided in Letter Agreement
6-1162-RLL-934R1.


Very truly yours,

THE BOEING COMPANY



By  /s/ Dawn S. Foster     
  ----------------------------

Its  Attorney-in-Fact      
   ---------------------------

ACCEPTED AND AGREED TO as of this

date:  December 19, 1997

SOUTHWEST AIRLINES CO.



By /s/ Gary A. Barron      
  ----------------------------

Its Executive VP & COO     
   ---------------------------




P.A. No. 1810
                                                                            SA-4
<PAGE>   114
6-1162-RLL-1855R3


Southwest Airlines Co.
P.O. Box 36611
Dallas, Texas 75235-1611


Subject:  Letter Agreement No. 6-1162-RLL-1855R3 to
          Purchase Agreement No. 1810
          Additional Contractual Matters



This Letter Agreement amends Purchase Agreement No. 1810 (the Agreement) between
The Boeing Company (Boeing) and Southwest Airlines Co. (Buyer) relating to the
sale by Boeing and the purchase by Buyer of one hundred twenty-nine (129) Model
737-7H4 aircraft (the Aircraft) and Letter Agreement 6-1162-RLL-933R4, dated
even date herewith, entitled "Option Aircraft", relating to the sale by Boeing
and the purchase by Buyer of sixty-two (62) additional Model 737-7H4 aircraft
(the Option Aircraft) and fifty-nine (59) Rollover Option Aircraft (the Rollover
Option Aircraft) and Letter Agreement No. 6-1162-RLL-938, dated January 19, 1994
entitled "Most Favored Customer" relating to terms of the Agreement.

All terms used herein and in the Agreement, and not defined herein, will have
the same meaning as in the Agreement.

1.   ***
     for the Aircraft.

     In further consideration of Buyer's purchase of the Aircraft, Boeing will
issue at the time of delivery of each Aircraft (whether Model 737-700, 737-600
or 737-800) *** (July 1992 STE) escalated to the month of delivery of the
specific Aircraft in accordance with Exhibit D "Aircraft Price adjustment" to be
used by Buyer for the purchase of Boeing and or CFMI goods 


P.A. No. 1810                                                         SA-4
<PAGE>   115
Southwest Airlines Co.
6-1162-RLL-1855R3   Page 2


and services or applied to the final delivery payment for the Aircraft for which
such ***.

2.   ***
     for the Aircraft.

3.   Applicable Aircraft.

     For the avoidance of doubt, ***

4.   Confidential Treatment

     Buyer understands that certain commercial and financial information
contained in this Letter Agreement are considered by Boeing as confidential.
Buyer agrees that it will treat this Letter Agreement and the information
contained herein as confidential and will not, without the prior written consent
of Boeing, disclose this Letter Agreement or any information contained herein to
any other person or entity, except as provided in Letter Agreement
6-1162-RLL-934R1.

Very truly yours,

THE BOEING COMPANY


By   /s/ Dawn S. Foster
   --------------------------

Its     Attorney-In-Fact
    -------------------------


ACCEPTED AND AGREED TO this

Date:  December 19, 1997

SOUTHWEST AIRLINES CO.

By  /s/ Gary A. Barron
   ---------------------------

Its   Executive VP & COO
    --------------------------




P.A. No. 1810                                               SA-4
<PAGE>   116
6-1162-RLL-1858R1




Southwest Airlines Co.
P.O. Box 36611
Dallas, Texas 75235-1611

Subject:  Letter Agreement No. 6-1162-RLL-1858R1 to
          Purchase Agreement No. 1810
          Escalation Matters

Gentlemen:

This Letter Agreement amends Purchase Agreement No. 1810 (the Agreement) between
The Boeing Company (Boeing) and Southwest Airlines Co. (Buyer) relating to the
sale by Boeing and the purchase by Buyer of Model 737-7H4 aircraft (the
Aircraft) and Letter Agreement 6-1162-RLL-933R1, dated even date herewith,
entitled "Option Aircraft", relating to the sale by Boeing and the purchase by
Buyer of sixty-two (62) additional Model 737-7H4 aircraft (the Option Aircraft)
and fifty-nine (59) Model 737-7H4 Rollover Option Aircraft (Rollover Option
Aircraft).

All terms used herein and in the Agreement, and not defined herein, will have
the same meaning as in the Agreement.

1.   Escalation Sharing Commitment

     Boeing agrees to share one-half of the escalation up to a maximum of three
percent (3%) per year in each of the years 1997 and 1998, as more fully
described in paragraph 2 below, for any Aircraft scheduled to be delivered after
December 31, 1996 (the Eligible Aircraft).

All escalation calculations under this Letter Agreement will be made in
accordance with Exhibit D to the Agreement entitled "Price Adjustment Due to
Economic 

P.A. No. 1810                                                              SA-4
<PAGE>   117
Southwest Airlines Co.
6-1162-RLL-1858R1   Page 2


Fluctuations - Aircraft Price Adjustment" (the Exhibit D), using actual
escalation indices published for the applicable period.

2.   Calculation of Escalation Credit Memo

     2.1 Eligible Aircraft Delivering in 1997 

     At the time of delivery of each Eligible Aircraft delivering in 1997,
Boeing will issue to Buyer a credit memorandum (the 1997 Credit Memorandum)
which shall be applied to the Aircraft Price of such Aircraft. The 1997 Credit
Memorandum for each Eligible Aircraft delivering in 1997 shall be calculated as
follows:

One-half of the difference between the Base Aircraft Price and Special Features
escalation amount calculated for a December 1996 aircraft delivery position, and
such escalation amount calculated for the month of delivery of each 1997
Eligible Aircraft; provided however;

The maximum amount of the 1997 Credit Memorandum shall not exceed three percent
(3%) pursuant to the following calculation:

At the time of the delivery of each 1997 Eligible Aircraft, the Aircraft Basic
Price will be escalated in accordance with the Exhibit D formula to a December
1996 delivery month. The December 1996 escalated price will be referred to in
the following formula as the "December 1996 Index Amount". The 1997 Credit
Memorandum for each 1997 Eligible Aircraft will not exceed an amount equal to
the December 1996 Index Amount times 0.03.

     2.2 Eligible Aircraft Delivering in 1998 

     At the time of delivery of each Eligible Aircraft delivering in 1998,
Boeing will issue to Buyer a credit memorandum (the 1998 Credit Memorandum)
which shall be applied to the Aircraft Price of such Aircraft. The 1998 Credit
Memorandum for each Eligible Aircraft delivering in 1998 shall be calculated as
follows:


P.A. No. 1810                                                               SA-4
<PAGE>   118
Southwest Airlines Co.
6-1162-RLL-1858R1   Page 3


(i) One-half of the difference between the Aircraft Basic Price escalation
amount calculated for a December 1997 aircraft delivery position, and such
escalation amount calculated for the month of delivery of each 1998 Eligible
Aircraft, provided however;

The maximum amount of the portion of the 1998 Credit Memorandum calculated
pursuant to this paragraph 2.2 (i) shall not exceed three (3%) percent pursuant
to the following calculation:

At the time of the delivery of each 1998 Eligible Aircraft, the Aircraft Basic
Price will be escalated in accordance with the Exhibit D formula to a December
1997 delivery month. The December 1997 escalated price will be referred to in
the following formula as the "December 1997 Index Amount." The portion of the
1998 Credit Memorandum calculated pursuant to this paragraph 2.2 (i) for the
1998 Eligible Aircraft will not exceed an amount equal to the December 1997
Index Amount times 0.03, plus;

(ii) The amount calculated above in paragraph 2.1 for the 1997 Credit Memorandum
calculated through December 1997.

     2.3 Eligible Aircraft Delivering after 1998 

     For each Eligible Aircraft delivering after the calendar year 1998, the
amount of the Credit Memorandum will be the amount calculated pursuant to
paragraph 2.2 above through a December 1998 aircraft delivery position.

3.   Advance Payment Base Price

     It is agreed that the Advance Payment Base Prices for the Eligible Aircraft
set forth in Article 3.4 of the Agreement include an estimate for the escalation
sharing Credit Memoranda pursuant to this Letter Agreement.


P.A. No. 1810                                                               SA-4
<PAGE>   119
Southwest Airlines Co.
6-1162-RLL-1858R1   Page 4


4.   Escalating Credits (STE)

     The credit memoranda specified in Article 1 of Letter Agreement No.
6-1162-RLL-936, as revised, and in Article 2 of Letter Agreement No.
6-1162-RLL-1855, as revised, which are expressed as a percentage of the
escalated purchase price of the Aircraft, will be calculated using the same
factors used to develop the adjusted aircraft escalation pursuant to this Letter
Agreement.

5.   Confidential Treatment

     Buyer understands that certain commercial and financial information
contained in this Letter Agreement are considered by Boeing as confidential.
Buyer agrees that it will treat this Letter Agreement and the information
contained herein as confidential and will not, without the prior written consent
of Boeing, disclose this Letter Agreement or any information contained herein to
any other person or entity, except as provided in Letter Agreement
6-1162-RLL-934R1.


Very truly yours,

THE BOEING COMPANY



By   /s/ Dawn S. Foster
   -----------------------------

Its     Attorney-In-Fact
    ----------------------------


ACCEPTED AND AGREED TO this

Date:  December 19, 1997


P.A. No. 1810                                                               SA-4
<PAGE>   120
Southwest Airlines Co.
6-1162-RLL-1858R1   Page 5



SOUTHWEST AIRLINES CO.



By  /s/ Gary A. Barron
   ----------------------------

Its  Executive VP & COO
    ---------------------------



P.A. No. 1810                                                               SA-4

<PAGE>   1
                                                                   EXHIBIT 22



                             SOUTHWEST AIRLINES CO.
                           SUBSIDIARIES OF THE COMPANY




Southwest Airlines Co. has five wholly owned subsidiaries:

         API Terminal, Inc., TranStar Airlines Corporation, Southwest Jet Fuel
Co., and Southwest ABQ RES Center, Inc., which are incorporated under the laws
of Texas and Triple Crown Insurance Ltd. a Bermuda limited liability company.





<PAGE>   1

                                                                      EXHIBIT 23

                       CONSENT OF INDEPENDENT AUDITORS


We consent to the incorporation by reference in the Registration Statements
(Form S-8 Nos. 333-20275, 33-48178, 33-57327, 33-40652, and 33-40653 and Form
S-3 Nos. 33-52115 and 33-59113) and in the related Prospectuses of our report
dated January 23, 1998 with respect to the consolidated financial statements of
Southwest Airlines Co. for the year ended December 31, 1997 included in this
Annual Report on Form 10-K.

                                                   ERNST & YOUNG LLP

                                                   /s/ Ernst & Young LLP

Dallas, Texas
March 16, 1998


<TABLE> <S> <C>

<ARTICLE> 5
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                              JAN-1-1997
<PERIOD-END>                               DEC-31-1997
<CASH>                                         623,343
<SECURITIES>                                         0
<RECEIVABLES>                                   76,530
<ALLOWANCES>                                         0
<INVENTORY>                                     52,376
<CURRENT-ASSETS>                               806,416
<PP&E>                                       4,811,324
<DEPRECIATION>                               1,375,631
<TOTAL-ASSETS>                               4,246,160
<CURRENT-LIABILITIES>                          868,513
<BONDS>                                              0
                                0
                                          0
<COMMON>                                       221,207
<OTHER-SE>                                   1,787,811
<TOTAL-LIABILITY-AND-EQUITY>                 4,246,160
<SALES>                                              0
<TOTAL-REVENUES>                             3,816,821
<CGS>                                                0
<TOTAL-COSTS>                                3,292,585
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              63,454
<INCOME-PRETAX>                                516,956
<INCOME-TAX>                                   199,184
<INCOME-CONTINUING>                            317,772
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   317,772
<EPS-PRIMARY>                                     1.45
<EPS-DILUTED>                                     1.40
        

</TABLE>


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