SECURITIES AND EXCHANGE COMMISSION
 WASHINGTON, D.C. 20549
FORM 10-Q/A
X QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15 (d)
OF THE SECURITIES EXCHANGE ACT OF 1934
FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 2001
 OR
TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d)
OF THE SECURITIES EXCHANGE ACT OF 1934
COMMISSION FILE NUMBER 1-7933
Aon CORPORATION
 (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

         DELAWARE                                          36-3051915
         --------                                          ----------
(STATE OR OTHER JURISDICTION OF                (IRS EMPLOYER IDENTIFICATION NO.)
INCORPORATION OR ORGANIZATION)

200 E. RANDOLPH ST. CHICAGO, ILLINOIS             60601
-------------------------------------             -----
                                                 (ZIP CODE)
                (312) 381-1000
                --------------
       (REGISTRANT'S TELEPHONE NUMBER)	

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 and Exchange Act of 1934 during the preceding 3 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

Number of shares of common stock outstanding:

       CLASS                                  NO. OUTSTANDING AS OF 9-30-01
       -----                                  -----------------------------

$1.00 par value Common                                269,217,702	

The purpose of this Form 10-Q/A is to file an amended Exhibit 15 to correct an error in the Exhibit. The date of the letter was November 8, 2001, and should have been November 13, 2001.
PART II
OTHER INFORMATION
ITEM 6. EXHIBITS AND REPORTS ON FORM 8-K
(a) Exhibits - The exhibits filed with this report are listed on the attached Exhibit Index.

(b) Reports on Form 8-K -
(i) No Current Reports on Form 8-K were filed for the quarter ended September 30, 2001.
(ii) The Registrant filed one Current Report on Form 8-K dated November 8, 2001. The following exhibit was included in the report: Exhibit 99 - Earnings Press Release issued on November 7, 2001.
SIGNATURE
Pursuant to the Requirements 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.
Aon CORPORATION
 (Registrant)

November 28, 2001                            /s/ Harvey N. Medvin
                                             --------------------
                                             HARVEY N. MEDVIN
                                             EXECUTIVE VICE PRESIDENT
                                              AND CHIEF FINANCIAL OFFICER
                                             (Principal Financial and Accounting
                                             Officer)	

- 2 -

Aon CORPORATION
Exhibit Number In Regulation S-K
Item 601 Exhibit Table
* (12) Statements regarding Computation of Ratios.
(a) Statement regarding Computation of Ratio of Earnings to Fixed Charges.
(b) Statement regarding Computation of Ratio of Earnings to Combined Fixed Charges and Preferred Stock Dividends.
(15) Letter re: Unaudited Interim Financial Information

*Previously filed.

- 3 -

Exhibit 15
Board of Directors and Stockholders
Aon Corporation
We are aware of the incorporation by reference in the Registration Statements of Aon Corporation ("Aon") described in the following table of our report dated November 13, 2001 relating to the unaudited condensed consolidated interim financial statements of Aon Corporation that are included in its Form 10-Q for the quarter ended September 30, 2001:
Registration Statement

Form            Number                  Purpose
----            ------                  -------

S-8          33-27984         Pertaining to Aon's savings plan
S-8          33-42575         Pertaining to Aon's stock award plan and
                                 stock option plan
S-8          33-59037         Pertaining to Aon's stock award plan and
                                 stock option plan
S-4          333-21237        Offer to exchange Capital Securities of
                                 Aon Capital A
S-3          333-50607        Pertaining to the registration of 369,000
                                 shares of common stock
S-8          333-55773        Pertaining  to Aon's  stock  award plan,
                                 stock  option  plan and employee stock
                                 purchase plan
S-3          333-78723        Pertaining to the registration  of debt
                                 securities, preferred stock and common
                                 stock
S-3          333-49300        Pertaining to the registration of
                                 3,864,824 shares of common stock
S-4          333-57706        Pertaining to the registration of up to
                                 3,852,184 shares of common stock
S-3          333-65624        Pertaining to the registration of
                                 2,000,000 shares of common stock	

Pursuant to Rule 436(c) of the Securities Act of 1933, our report is not a part of the registration statements prepared or certified by accountants within the meaning of Section 7 or 11 of the Securities Act of 1933.
ERNST & YOUNG LLP
Chicago, Illinois
November 13, 2001