AON CORP
11-K/A, 2000-06-21
ACCIDENT & HEALTH INSURANCE
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   FORM 11-K/A
                                 Amendment No. 1




  X         Annual Report Pursuant to Section 15(d) of the Securities
_____       Exchange Act of 1934
            For the fiscal year ended December 31, 1999

                                       OR

_____       Transition Report Pursuant to Section 15(d) of the
            Securities Exchange Act of 1934



            A.    Full  title  of the  plan  and the  address  of the  plan,  if
                  different from the issuer named below:

                                Aon Savings Plan


            B.    Name of the  issuer of the  securities  held  pursuant  to the
                  plan and the address of its principal executive office:


                                 Aon Corporation
                               123 N. Wacker Drive
                             Chicago, Illinois 60606


<PAGE>
                               S I G N A T U R E S

Pursuant to the  requirements of the Securities  Exchange Act of 1934, the Plan,
by the Plan  Administrator,  the Committee,  has caused this annual report to be
signed on its  behalf by the  undersigned,  thereunto  duly  authorized,  in the
County of Cook and the State of Illinois on the 15th day of June, 2000.

AON SAVINGS PLAN

BY THE COMMITTEE



/s/ THOMAS STACHURA                       /s/ JOHN A. RESCHKE
-------------------------------           --------------------------------
Thomas Stachura                           John A. Reschke




/s/ NANCY GROSS                           /s/ ROBERT S. Hurwitz
-------------------------------           --------------------------------
Nancy Gross                               Robert S. Hurwitz




/s/ ELIZABETH WHITTLE
-------------------------------
Elizabeth Whittle


                                     - 2 -
<PAGE>


                 FINANCIAL STATEMENTS AND SUPPLEMENTAL SCHEDULE

                                AON SAVINGS PLAN

                     Years Ended December 31, 1999 and 1998

                       With Report of Independent Auditors

                    Employer Identification Number 36-3051915

                                   Plan # 020


<PAGE>
                                AON SAVINGS PLAN

                 FINANCIAL STATEMENTS AND SUPPLEMENTAL SCHEDULE

                     Years ended December 31, 1999 and 1998


                                    CONTENTS




Report of Independent Auditors                                               1

Financial Statements

      Statement of Net Assets Available for Benefits
      at December 31, 1999                                                   2

      Statement of Net Assets Available for Benefits
      at December 31, 1998                                                   3

      Statement of Changes in Net Assets Available for Benefits
      for the year ended December 31, 1999                                   4

      Statement of Changes in Net Assets Available for Benefits

      for the year ended December 31, 1998                                   5

Notes to Financial Statements                                                6

Supplemental Schedule:

      Schedule H, Line 4i - Schedule of Assets Held for Investment
      Purposes At End of Year                                               13



<PAGE>
                         Report of Independent Auditors


The Participants and Administrative Committee
Aon Savings Plan


We have audited the accompanying statements of net assets available for benefits
of Aon Savings Plan as of December 31, 1999 and 1998, and the related statements
of changes in net assets available for benefits for the years then ended.  These
financial  statements  are the  responsibility  of the  Plan's  management.  Our
responsibility  is to express an opinion on these financial  statements based on
our audits.

We conducted our audits in accordance with auditing standards generally accepted
in the United States. 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 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 net assets  available  for benefits of the Plan at
December  31,  1999 and 1998,  and the changes in its net assets  available  for
benefits for the years then ended,  in  conformity  with  accounting  principles
generally accepted in the United States.

Our audits  were  performed  for the  purpose of forming an opinion on the basic
financial statements taken as a whole. The accompanying supplemental schedule of
assets held for  investment  purposes at end of year as of December 31, 1999, is
presented for purposes of additional  analysis and is not a required part of the
financial  statements,   but  is  supplementary   information  required  by  the
Department of Labor's Rules and Regulations  for Reporting and Disclosure  under
the Employee Retirement Income Security Act of 1974. This supplemental  schedule
is the  responsibility of the Plan's management.  The supplemental  schedule has
been  subjected  to the auditing  procedures  applied in our audits of the basic
financial  statements  and, in our  opinion,  is fairly  stated in all  material
respects in relation to the basic financial statements taken as a whole.




                                                ERNST & YOUNG LLP



June 9, 2000

<PAGE>
                                       Employer Plan Identification # 36-3051915
                                       Plan # 020


                                                   AON SAVINGS PLAN
                                  Statement of Net Assets Available for Benefits
                                                     December 31, 1999
                                                    (in thousands)
                                          --------------------------------------


                                                            ESOP
                                            SAVINGS       ALLOCATED
ASSETS:                                       PLAN         ACCOUNT        TOTAL
-------                                   -----------   -----------    ---------

Investments, at Fair Value:
     Aon Corporation Common Stock        $  368,186    $   221,192    $  589,378
     Investments held in Mutual Funds:
        Aon Money Market Fund               247,776              -       247,776
        Aon Government Securities Fund       41,530              -        41,530
        Aon Asset Allocation Fund           174,280              -       174,280
        IRT 500 Index Fund                  317,869              -       317,869
        Aon REIT Index Fund                  16,635              -        16,635
        IRT International Equity Fund        41,402              -        41,402
     Participant Loans                       17,017              -        17,017
                                          -----------   -----------    ---------

                                          1,224,695        221,192     1,445,887


Company Contribution Receivable              23,500         14,123        37,623

                                          -----------   -----------    ---------
TOTAL NET ASSETS AVAILABLE FOR BENEFITS $ 1,248,195    $   235,315   $ 1,483,510
                                          ===========   ===========    =========


     See notes to financial statements.


<PAGE>
<TABLE>
<CAPTION>
                                                               Employer Plan Identification # 36-3051915
                                                               Plan # 020


                                                             AON SAVINGS PLAN
                                               STATEMENT OF NET ASSETS AVAILABLE FOR BENEFITS
                                                             DECEMBER 31, 1998
                                                               (IN THOUSANDS)
                                          ------------------------------------------------------


                                                                   ESOP                ESOP
                                               SAVINGS           ALLOCATED         UNALLOCATED
ASSETS:                                         PLAN              ACCOUNT            ACCOUNT             TOTAL
-------                                   ---------------    ----------------   ----------------   ---------------

<S>                                       <C>                <C>                                   <C>
Investments, at Fair Value:
     United States Government and
        Government Agency Securities      $        92,425                                          $         92,425
     Common Stocks:
       Aon Corporation                            368,496    $       219,601                                588,097
     Investments held in Mutual Funds:
        Aon Money Market Fund                     133,933                  -                                133,933
        Aon Government Securities Fund             49,186                  -                                 49,186
        Aon Asset Allocation Fund                 164,318                  -                                164,318
        Aon S&P 500 Index Fund                    251,594                  -                                251,594
        Aon REIT Index Fund                        19,603                  -                                 19,603
        Aon International Equity Fund              27,014                  -                                 27,014
     Other Long-Term Investments                        5                  -                                      5
     Short-Term Investments                        23,705              2,324    $            677             26,706
     Participant Loans                             13,161                  -                   -             13,161
                                            ---------------    ----------------   ----------------   ---------------

                                                1,143,440            221,925                 677          1,366,042

     Unallocated Guaranteed Insurance Contracts
        at Contract Value                          11,455                  -                   -             11,455
                                            ---------------    ----------------   ----------------   ---------------

               Total Investments                1,154,895            221,925                 677          1,377,497


Receivables:
     Company Contribution                          21,476                  -              15,625             37,101
     Participant Contribution                       1,890                  -                   -              1,890
     Accrued Dividends and Income                   2,061                 12                   3              2,076
     Due from Broker                                   68                  -                   -                 68
     Fund Transfers                                     -             (1,825)              1,825                  -
                                            ---------------    ----------------   ----------------   ---------------

               Total Receivables                   25,495             (1,813)             17,453             41,135
                                            ---------------    ----------------   ----------------   ---------------

        TOTAL ASSETS                            1,180,390            220,112              18,130          1,418,632

LIABILITIES:
------------
     Accrued Administrative Expenses Payable          389                115                   2                506
     Accrued Interest Expense                           -                  -                  61                 61
     Notes Payable                                      -                  -              17,500             17,500
     Due to Broker                                    200                  -                   -                200

                                            ---------------    ----------------   ----------------   ---------------
        TOTAL LIABILITIES                             589                115              17,563             18,267
                                            ---------------    ----------------   ----------------   ---------------


                                            ------------------------------------------------------------------------
TOTAL NET ASSETS AVAILABLE FOR BENEFITS   $     1,179,801            219,997                 567          1,400,365
                                            ===============    ================   ================   ===============
</TABLE>

     See notes to financial statements.


                                      - 3 -
<PAGE>
<TABLE>
<CAPTION>
                                                                 Employer Plan Identification # 36-3051915
                                                                 Plan #  020


                                                           AON SAVINGS PLAN
                                        Statement of Changes in Net Assets Available for Benefits
                                                        Year Ended December 31, 1999
                                                            (in thousands)
                                        ------------------------------------------------------------------------



                                                                ESOP               ESOP
                                           SAVINGS           ALLOCATED          UNALLOCATED
                                             PLAN             ACCOUNT             ACCOUNT             TOTAL
                                        ---------------    ---------------     --------------     --------------

<S>                                     <C>                <C>                 <C>                <C>
NET INVESTMENT INCOME
   Interest and Income from Unallocated
     Guaranteed Insurance Contracts     $       3,432      $           65      $         210      $       3,707
   Net Realized and Unrealized Appreciation
   (Depreciation) in Fair Value of Investments 104,923             18,169                  -            123,092
   Aon Corporation Dividends                     7,920              4,680                  -             12,600
   Other Dividends                              18,434                  -                  -             18,434
   Interest Expense                                  -                  -               (670)              (670)
   Management and Administrative fees           (1,595)              (342)                (4)            (1,941)
                                        ---------------    ---------------     --------------     --------------

TOTAL NET INVESTMENT INCOME                    133,114             22,572               (464)           155,222

CONTRIBUTIONS
   Company                                      23,500             14,123                  -             37,623
   Participants                                 65,040                  -                  -             65,040
                                        ---------------    ---------------     --------------     --------------

TOTAL CONTRIBUTIONS                             88,540             14,123                  -            102,663

ALLOCATIONS

   ESOP Diversification                          1,015             (1,015)                 -                  -
                                        ---------------    ---------------     --------------     --------------

TOTAL ALLOCATIONS                                1,015             (1,015)                 -                  -

OTHER CHANGES

Benefit Payments                              (154,275)           (20,465)                 -           (174,740)
Interfund Transfers                                  -                103               (103)                 -

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

TOTAL OTHER CHANGES                           (154,275)           (20,362)              (103)          (174,740)
                                        ---------------    ---------------     --------------     --------------

NET INCREASE (DECREASE) IN NET ASSETS
    AVAILABLE FOR BENEFITS                      68,394             15,318               (567)            83,145

NET ASSETS AVAILABLE FOR
     BENEFITS AT BEGINNING OF YEAR           1,179,801            219,997                567          1,400,365

                                        ---------------    ---------------     --------------     --------------
NET ASSETS AVAILABLE FOR BENEFITS
     AT END OF YEAR                     $    1,248,195     $      235,315      $           -      $   1,483,510
                                        ===============    ===============     ==============     ==============

</TABLE>
    See notes to financial statements


                                      - 4 -
<PAGE>
<TABLE>
<CAPTION>
                                                                        Employer Plan Identification # 36-3051915
                                                                        Plan #  020


                                                                 AON SAVINGS PLAN
                                              STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS
                                                              YEAR ENDED DECEMBER 31, 1998
                                                                  (IN THOUSANDS)
                                              ------------------------------------------------------------------------



                                                                      ESOP               ESOP
                                                 SAVINGS           ALLOCATED          UNALLOCATED
                                                   PLAN             ACCOUNT             ACCOUNT             TOTAL
                                              ---------------    ---------------     --------------     --------------

<S>                                           <C>                <C>                 <C>                <C>
NET INVESTMENT INCOME
   Interest and Income from Unallocated
     Guaranteed Insurance Contracts           $        6,891     $          138      $         423      $       7,452
   Net Realized and Unrealized Appreciation
    (Depreciation) in Fair Value of Investments       33,694             21,204            (30,333)            24,565
   Aon Corporation Dividends                           7,479              3,767                807             12,053
   Other Dividends                                    19,860                  -                  -             19,860
   Interest Expense                                        -                  -             (2,384)            (2,384)
   Management and Administrative fees                 (1,244)              (371)               (17)            (1,632)
                                              ---------------    ---------------     --------------     --------------

TOTAL NET INVESTMENT INCOME                           66,680             24,738            (31,504)            59,914

CONTRIBUTIONS
   Company                                            21,476                  -             15,625             37,101
   Participants                                       58,388                  -                  -             58,388
                                              ---------------    ---------------     --------------     --------------

TOTAL CONTRIBUTIONS                                   79,864                  -             15,625             95,489

ALLOCATIONS

   Leveraged ESOP Allocation                               -              8,558             (8,558)                 -
   ESOP Diversification                                  235               (235)                 -                  -
                                              ---------------    ---------------     --------------     --------------

TOTAL ALLOCATIONS                                        235              8,323             (8,558)                 -

OTHER CHANGES

Benefit Payments                                    (106,738)           (15,714)                 -           (122,452)
Plan Mergers                                         269,345            202,650             25,004            496,999

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

TOTAL OTHER CHANGES                                  162,607            186,936             25,004            374,547
                                              ---------------    ---------------     --------------     --------------

NET INCREASE (DECREASE) IN NET ASSETS
    AVAILABLE FOR BENEFITS                           309,386            219,997                567            529,950

NET ASSETS AVAILABLE FOR
     BENEFITS AT BEGINNING OF YEAR                   870,415                  -                  -            870,415

                                              ---------------    ---------------     --------------     --------------
NET ASSETS AVAILABLE FOR BENEFITS
     AT END OF YEAR                           $    1,179,801     $      219,997      $         567      $   1,400,365
                                              ===============    ===============     ==============     ==============
</TABLE>

    See notes to financial statements


                                      - 5 -
<PAGE>
                                       Employer Plan Identification # 36-3051915
                                       Plan # 020



                                AON SAVINGS PLAN

                          NOTES TO FINANCIAL STATEMENTS

                     Years Ended December 31, 1999 and 1998

1.    DESCRIPTION OF PLAN

      GENERAL

      The Aon Savings Plan (the Plan) was  authorized  by the Board of Directors
      of Aon Corporation  (the Company or Plan Sponsor).  The Plan is subject to
      the  provisions  of the Employee  Retirement  Income  Security Act of 1974
      (ERISA).

      Effective  January  15,  1997,  Aon  Corporation  acquired  Alexander  and
      Alexander  Services,  Inc.,  the  plan  sponsor  of the  Thrift  Plan  for
      Employees of Alexander  and  Alexander  Services,  Inc. and  Subsidiaries.
      On  January 1,  1998,  the Thrift  Plan for  Employees  of  Alexander  and
      Alexander Services, Inc. and Subsidiaries was merged into the Plan.

      Also on January 1, 1998, the Aon Employees Stock Ownership Plan (ESOP) was
      merged  into  the  Plan.   The  ESOP  was  a   non-contributory,   defined
      contribution  plan  covering  all  employees  of the  Company  except  for
      employees covered by a collective  bargaining  agreement.  Features of the
      ESOP carried over to the Plan.

      Certain  Plan assets are held by the Aon Funds,  an  affiliated,  open-end
      management  investment company. The assets of the ESOP portion of the Plan
      are  invested  primarily  in common  stock of the  Company.  Additionally,
      certain  assets are invested by the Trustees as deemed  advisable in order
      for the Plan to meet its cash flow needs.  The  acquisition of the Company
      common  stock for the ESOP was  financed by loans  obtained  from  various
      lenders.

      The following  description of the Plan provides only general  information.
      Participants of the Plan should refer to the Summary Plan  Description for
      a more complete description of the Plan.


                                     - 6 -
<PAGE>
1.    DESCRIPTION OF PLAN (CONTINUED)

      ELIGIBILITY AND PARTICIPATION

      Participation  is  limited to  employees  who have  completed  one year of
      service,  attained  the age of 21 and  worked  1,000  or more  hours  in a
      calendar year or employees  who were eligible  under another plan that was
      merged into the Aon  Savings  Plan.  An  employee  must be employed in the
      United States on a permanent basis in order to participate.

      CONTRIBUTIONS

      PARTICIPANT  -  Participant  contributions  are made by  means of  regular
      payroll deductions. Non-highly compensated Participants, as defined by the
      Internal  Revenue Code (IRC), may elect to make  contributions  between 1%
      and 16% of their compensation,  as defined by the Plan. Highly compensated
      Participants,  as  defined  by the IRC,  may  elect to make  contributions
      between  1%  and  8% of  their  compensation,  as  defined  by  the  Plan.
      Participant  contributions  are limited to amounts allowed by the Internal
      Revenue Service (IRS).  Accordingly,  the maximum Participant contribution
      was $10,000 in 1999 and 1998.

      COMPANY - The Company will contribute an amount equal to 100% of the first
      3%  of  a  Participant's   compensation  that  a  Participant  chooses  to
      contribute to the Plan.  The Company will make a further  contribution  to
      the ESOP  portion of the Plan equal to 75% of the next 3% of  compensation
      that is  contributed  to the Plan. The Plan requires that a Participant be
      actively  employed and  contributing to the Plan as of the last day of the
      Plan year in order to receive a Company contribution.

      Contributions to the ESOP portion of the Plan are  automatically  invested
      in common stock of the Company.

      ALLOCATION OF ESOP SHARES TO PARTICIPANTS

      The common stock of the Company  allocated to  Participants as a result of
      debt service paid by allocated  share dividend  monies is based on account
      balance.  The common stock of the Company  allocated to  Participants as a
      result of debt service  paid by  Participants'  cash  balances is based on
      cash balance. The common stock of the Company allocated to Participants as
      a result of all other debt  service is based on eligible  compensation.  A
      Participant's  eligible  compensation  is limited to amounts allowed under
      the  Tax  Reform  Act of  1986.  Accordingly,  the  maximum  Participants'
      eligible compensation was $160,000 for 1999 and 1998.


                                     - 7 -
<PAGE>
1.    DESCRIPTION OF PLAN (CONTINUED)

      INVESTMENT OPTIONS

      Contributions  to the  Plan,  other  than  for the  ESOP  portion,  may be
      invested in any of the seven investment  alternatives  offered by the Plan
      in any whole percentages.

      PARTICIPANT ACCOUNTS

      Each Participant's account is credited with the Participant's contribution
      and a) an allocation of the Company's  contributions,  b) an allocation of
      Plan  earnings,   and  c)  an  allocation  of  Forfeitures  of  terminated
      Participants'  non-vested accounts.  The benefit to which a Participant is
      entitled  is the  benefit  that can be  provided  from  the  Participant's
      account.

      VESTING

      For the ESOP portion of the Plan, a  Participant  vests in 20%  increments
      and becomes 100% vested after  completion  of five years of Plan  Service.
      Forfeitures  of  non-vested   accounts  are  allocated  to  the  remaining
      Participants.  The amount of  forfeitures  allocated to  Participants  was
      $815,000 and  $1,954,000 of the  Company's  common stock in 1999 and 1998,
      respectively.

      For the  non-ESOP  portion of the Plan,  Participants  are fully vested in
      their contributions plus actual earnings thereon. Participants become 100%
      vested in the remainder of their account  balance after five years of Plan
      Service,  according  to  a  graded  schedule.  Forfeitures  of  non-vested
      accounts  are  allocated  to the  remaining  Participants.  The  amount of
      forfeitures  allocated to Participants  was $456,000 and $821,000 for 1999
      and 1998, respectively.

      BENEFIT PAYMENTS

      For the ESOP portion of the Plan, a Participant's  entire account shall be
      paid to him or his  beneficiary in a lump sum upon his normal  retirement,
      permanent  disability or death.  The  Participant may elect payment in the
      form of shares or cash.

      For the non-ESOP  portion,  on termination of service,  a Participant  may
      elect to receive either a lump sum amount equal to the value of his or her
      account and/or monthly installments over a period not to exceed ten years.

      PLAN TERMINATION

      Although  it has not  expressed  any intent to do so, the  Company has the
      right under the Plan to discontinue its  contributions  at any time and to
      terminate  the Plan subject to the  provisions  of ERISA.  In the event of
      Plan termination, Participants will become 100% vested in their accounts.


                                     - 8 -
<PAGE>
1.    DESCRIPTION OF PLAN (CONTINUED)

      PARTICIPANT LOANS

      Under the loan  provision of the Plan,  each  Participant is permitted one
      loan in a twelve  month  period and the  outstanding  balance of all loans
      made to a  Participant  may not exceed the lesser of $50,000 or 50% of the
      vested portion of the Participant's  account excluding the ESOP portion of
      the account. The interest rate for each loan is equal to 1% plus the prime
      rate as quoted in The Wall  Street  Journal  for the last day of the month
      preceding  the loan  request.  Loans  are made for a period  of up to five
      years, except for residential loans which have a fixed repayment period of
      ten years.


2.    SIGNIFICANT ACCOUNTING POLICIES

      BASIS OF ACCOUNTING

      The  financial  statements of the Plan are prepared on an accrual basis in
      accordance with generally accepted accounting principles.

      INVESTMENT VALUATION

      Investments,  except for unallocated  guaranteed insurance contracts,  are
      carried  at fair  value,  which  for  marketable  securities  is  based on
      quotations obtained from national  securities  exchanges and various other
      sources.  Investments in unallocated  guaranteed  insurance  contracts are
      valued at contract value,  which represents  contributions  made under the
      contract,  plus interest at the contract rate,  less any  withdrawals  and
      administrative  expenses.  Participant  loans  are  valued  at cost  which
      approximates fair value.

      Interest income is recorded as earned.  Dividend income is recorded on the
      ex-dividend  date.  Realized  gains  or  losses  on  investments  are  the
      difference  between the proceeds received and the cost of investments sold
      as determined on a first-in, first-out basis. The change in the difference
      between fair value and the cost of  investments  is reported as unrealized
      appreciation or depreciation of investments.

      ADMINISTRATIVE EXPENSES

      Administrative  expenses of the Plan,  including expenses of the Trustees,
      are paid from the Plan assets,  except to the extent that the Company,  at
      its discretion,  may decide to pay such expenses.  The Company did not pay
      any  Plan  expenses  in 1999 and  1998.  Administrative  expenses  include
      $595,000  and  $1,444,000  in  1999  and  1998,   respectively,   paid  to
      subsidiaries of the Company.

                                     - 9 -
<PAGE>
2.    SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

      RECLASSIFICATIONS

      Certain amounts in the 1998 financial statements have been reclassified to
      conform to the 1999 presentation.

      USE OF ESTIMATES

      The  preparation of the 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 those estimates.

3.    ALLOCATION OF ESOP SHARES TO PARTICIPANTS

      Prior to the 1999  final  payoff of the Notes  Payable  (note 5), all ESOP
      shares were held by the Plan in a suspense  account and were  allocated to
      the  Participants  on an annual basis as interest and  principal  payments
      were made.  The common  stock  allocated  each year  equaled the number of
      unallocated shares  immediately  before such allocation  multiplied by the
      ratio of interest and principal  paid on the notes during the current Plan
      year to the sum of the current year payments  plus  principal and interest
      to be paid in future years.  There were no shares allocated to Participant
      accounts in 1999 and 733,941 shares  allocated to Participant  accounts in
      1998.

      Because the allocation to Participants is based on estimates, the ultimate
      allocation  may vary from the  estimate.  The  variances,  which  were not
      material, were adjusted in the following year.

4.    INVESTMENTS

      For 1998,  The Northern Trust Company was custodian of the Plan assets and
      Trustee for the Aon Common Stock Fund. For the remaining funds, members of
      the Company's management were the trustees. For 1999,  Institutional Trust
      Company  (ITC) is  custodian  of the Plan  assets and Trustee for all Plan
      assets  except  the ESOP  shares.  For the  ESOP  shares,  members  of the
      Company's management are the trustees.  The Trustees are named fiduciaries
      under ERISA. As used herein, Trustee refers to The Northern Trust Company,
      the Institutional Trust Company and Company's management  individually and
      collectively.


<PAGE>
4.    INVESTMENTS (CONTINUED)

      During 1999 and 1998 the Plan's investments (including investments bought,
      sold and held during the year) appreciated  (depreciated) in fair value as
      follows (in thousands):
                                                         December 31
                                                1999                   1998
                            ---------------------------------------------------


                                         Net Realized           Net Realized
                                       and Unrealized         and Unrealized
                                         Appreciation           Appreciation
                                       (Depreciation)         (Depreciation)
                                        in Fair Value          in Fair Value
                                       of Investments         of Investments
                                    Fair       During      Fair       During
                                    Value    the Year      Value    the Year
                            ---------------------------------------------------
Investments, at fair value:
 United States Government And
   Agency Issues               $         - $      438 $    92,425 $      927
   Other Investments                     -          -           5          -
  Common Stock:
   Aon Corporation                 589,378     47,564     588,097    (30,126)
  Investments in Mutual Funds:
   Aon Money Market Fund           247,776          -     133,933          -
   Aon Government Securities Fund   41,530    (5,637)      49,186      1,971
   Aon Asset Allocation Fund       174,280     19,266     164,318      3,453
   Aon S&P 500 Index Fund                -     23,268     251,594     51,162
   Aon REIT Index Fund              16,635    (2,625)      19,603    (5,855)
   Aon International Equity Fund         -      2,358      27,014      3,035
   IRT 500 Index Fund              317,869     31,775           -          -
   IRT International Equity         41,402      6,685           -          -
Fund
 Unallocated Guaranteed Insurance
   Contracts, at contract value:
   Combined Ins. Co. of America          -          -       5,438          -
   Protective Life Insurance Co.         -          -       5,406          -
   Travelers Insurance Company           -          -         611          -
  Short-Term Investment Funds            -          -      26,706        (2)
                               ----------------------------------------------
  Total                        $ 1,428,870 $ 123,092  $  1,364,33 $   24,565
                               ----------------------------------------------

                                     - 11 -
<PAGE>
4.    INVESTMENTS (CONTINUED)


      The fair value of individual  investments that represent 5% or more of the
      Plan's net assets is as follows (in thousands):
                                                              December 31

                                                      1999               1998
                                                      ----               ----
      Aon Corporation, Common Stock           $ 589,378*             $ 588,097*
      Investments held in Mutual Funds:
        Aon Money Market Fund                   247,776                133,933
        Aon Asset Allocation Fund               174,280                164,318
        Aon S&P 500 Index Fund                        -                251,594
        IRT 500 Index Fund                      317,869                      -

      *Includes $221,192 and $219,601 of nonparticipant  directed investments in
      1999 and 1998, respectively.

5.         NOTES PAYABLE

      The  Plan  originally   borrowed   $90,000,000   from  various   financial
      institutions to purchase  5,383,326  shares of the Company's common stock.
      The notes were unconditionally  guaranteed by the Company. During 1999 and
      1998, the interest rate on the notes was 8.35%.  The notes were segregated
      into two series,  Series A and Series B.  During  1999 and 1998,  interest
      paid was approximately $670,000 and $2,384,000, respectively.

      The  Series A note  allowed  the Plan to borrow up to  $43,900,000.  Final
      payment was made on June 15, 1996.

      The Series B note allowed the Plan to borrow up to $46,100,000.  Principal
      payments are scheduled to be repaid annually beginning September 15, 1997.
      Interest is paid semi-annually. The final principal payment of $17,500,000
      was paid on June 15, 1999.

6.          Income Tax Status

      The IRS ruled on April  10,  1995 that the Plan  qualified  under  Section
      401(a) and (k) of the IRC and therefore,  the related trust is not subject
      to tax under present income tax law. Once qualified,  the Plan is required
      to operate in conformity with the IRC to maintain its  qualification.  The
      Plan  Administrative  Committee  believes the Plan is qualified  under the
      relevant  sections of the Code and is not aware of any course of action or
      series of events that have occurred that might adversely affect the Plan's
      qualified status.

                                     - 12 -
<PAGE>
<TABLE>
<CAPTION>
                                                                   Employer Identification # 36-3051915
                                                                   Plan #  020
                                   AON SAVINGS PLAN
    Schedule H, Line 4i - SCHEDULE OF ASSETS HELD FOR INVESTMENT PURPOSES AT END OF YEAR
                                  December 31, 1999

                                 Number of Shares
                                 ----------------                             Current Value
Identity of Issuer                Principal Amount                             (thousands)
-------------------------------------------------------------------------------------------
<S>                                     <C>                            <C>
Aon COMMON STOCK
----------------
COMMON STOCK

     Aon Corporation
     Common Stock, 1.00 par*            9,204,641                      $           368,186
                                                                         ==================


MONEY MARKET FUND
-----------------
MUTUAL FUND

     Investments held in the Aon
     Money Market Fund*                47,775,788                      $           247,776
                                                                         ==================


GOVERNMENT SECURITIES FUND
--------------------------
MUTUAL FUND

     Investments held in the Aon
     Government Securities Fund*        4,348,755                      $            41,530
                                                                         ==================


TOTAL RETURN FUND
-----------------
MUTUAL FUND

     Investments held in the Aon
     Asset Allocation Fund*            10,454,733                      $           174,280
                                                                         ==================


COMMON STOCK INDEX FUND
-----------------------
MUTUAL FUND

     Investments held in the IRT
      500 Index Fund                    9,113,233                      $           317,869
                                                                         ==================


REAL ESTATE SECURITIES FUND
---------------------------
MUTUAL FUND

     Investments held in the Aon
     REIT Index Fund*                   1,822,052                      $            16,635
                                                                         ==================

INTERNATIONAL EQUITY FUND
-------------------------
MUTUAL FUND

     Investments held in the IRT
     International Equity Fund          1,780,739                      $            41,402
                                                                         ==================

                                     - 13 -
<PAGE>
                                                                   Employer Identification # 36-3051915
                                                                   Plan #  020
                                   AON SAVINGS PLAN
    Schedule H, Line 4i - SCHEDULE OF ASSETS HELD FOR INVESTMENT PURPOSES AT END OF YEAR
                                  December 31, 1999
                                      (continued)

                                 Number of Shares
                                 ----------------           Cost              Current Value
Identity of Issuer                Principal Amount      (thousands)            (thousands)
-------------------------------------------------------------------------------------------

ESOP ALLOCATED  FUND
--------------------
COMMON STOCK

     Aon Corporation
     Common Stock, 1.00 par*            5,529,793     $     65,532     $           221,192
                                                        ===========      ==================



     Participant Loans (7%-11%)                 -                -                  17,017


                                                                       $         1,445,887
                                                                         ==================
<FN>
*     Party in interest transaction not prohibited by ERISA.
</FN>
</TABLE>


                                     - 14 -
<PAGE>

                         Consent of Independent Auditors


We consent to the  incorporation  by  reference in the  Registration  Statements
(Form S-8 No. 33-27894) pertaining to the Aon Savings Plan of Aon Corporation of
our report dated June 9, 2000,  with  respect to the  financial  statements  and
schedules of the Aon Savings Plan included in this annual report (Form 11-K) for
the year ended December 31, 1999.



                                                ERNST & YOUNG LLP




Chicago, Illinois
June 9, 2000


<PAGE>

June 15, 2000





Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C.   20549

      Re:   Report on Form 11-K for the Aon Savings Plan
            Registrant:  Aon Corporation
            Commission File No.:  1-7933


Gentlemen and Ladies:

      Enclosed with this EDGAR  transmission  is the above  referenced Form 11-K
for the Aon Savings Plan.

      Pursuant to  Securities  Act Release No.  33-7331,  no filing fee is being
paid herewith as it was eliminated effective October 7, 1996.

      Please contact the undersigned at 312/701-3835 if you have any questions.

Very truly yours,


/S/ JEROME S. HANNER

Jerome S. Hanner
Senior Counsel

JSH/ks Enclosures


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