UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of
the Securities Exchange Act of 1934 (Amendment No.          )

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Filed by a Party other than the Registrant o
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o	Preliminary Proxy Statement
o	Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
o	Definitive Proxy Statement
ý	Definitive Additional Materials
o	Soliciting Material Pursuant to §240.14a-12

AAR CORP.
(Name of Registrant as Specified In Its Charter)
(Name of Person(s) Filing Proxy Statement, if other than the Registrant)
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M26936-P00550 You are receiving this communication because you hold shares in the above named company. This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse side). We encourage you to access and review all of the important information contained in the proxy materials before voting. AAR CORP. *** Exercise Your Right to Vote *** Important Notice Regarding the Availability of Proxy Materials for the Shareholder Meeting to Be Held on October 13, 2010. AAR CORP. 1100 N. WOOD DALE ROAD WOOD DALE, IL 60191 Meeting Information Meeting Type: Annual Meeting For holders as of: August 19, 2010 Date: October 13, 2010 Time: 9:00 a.m., Central Time Location: 1100 North Wood Dale Road Wood Dale, IL 60191 See the reverse side of this notice to obtain proxy materials and voting instructions.

M26937-P00550 How To Vote Please Choose One of the Following Voting Methods Vote In Person: Many shareholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance. At the meeting, you will need to request a ballot to vote these shares. Vote By Internet: To vote now by Internet, go to www.proxyvote.com. Have the information that is printed in the box marked by the arrow available and follow the instructions. Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a proxy card. XXXX XXXX XXXX Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before September 29, 2010 to facilitate timely delivery. How to View Online: Have the information that is printed in the box marked by the arrow (located on the following page) and visit: www.proxyvote.com. How to Request and Receive a PAPER or E-MAIL Copy: If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request: 1) BY INTERNET: www.proxyvote.com 2) BY TELEPHONE: 1-800-579-1639 3) BY E-MAIL*: sendmaterial@proxyvote.com * If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box marked by the arrow (located on the following page) in the subject line. Before You Vote How to Access the Proxy Materials NOTICE AND PROXY STATEMENT ANNUAL REPORT Proxy Materials Available to VIEW or RECEIVE: XXXX XXXX XXXX XXXX XXXX XXXX

Voting Items M26938-P00550 2. Approval of the AAR CORP. Section 162(m) Annual Cash Incentive Plan 3. Ratification of the appointment of KPMG LLP as the Company's independent registered public accounting firm for the fiscal year ending May 31, 2011 01) Norman R. Bobins 02) James E. Goodwin 03) Marc J. Walfish 1. Election of Directors Nominees NOTE: As to any other business as may properly come before the meeting or any adjournment or postponement thereof, this Proxy will be voted in the discretion of the proxies. THE BOARD OF DIRECTORS RECOMMENDS A VOTE FOR THE FOLLOWING: THE BOARD OF DIRECTORS RECOMMENDS A VOTE FOR PROPOSALS 2 AND 3.

M26939-P00550

***IMPORTANT MESSAGE ABOUT VOTING YOUR SHARES*** Recently, NYSE and SEC rule changes were enacted changing how shares held in brokerage accounts are voted in director elections. If YOU do not vote your shares on proposal one (Election of Directors), your brokerage firm can no longer vote them for you; your shares will remain unvoted. Previously, if your broker did not receive instructions from you, they were permitted to vote your shares for you in director elections. However, starting January 1, 2010, under changes to NYSE Rule 452, brokers will no longer be allowed to vote uninstructed shares. Therefore, it is very important that you vote your shares for all proposals including the election of directors. In addition to checking the appropriate boxes on the enclosed vote instruction form, signing and returning it in the enclosed postage paid envelope, there are two additional convenient ways to vote that are available 24 hours a day: Do not return your vote instruction form if you are voting by Internet or Telephone Vote by Telephone Call toll-free on a touch-tone phone in the U.S. or Canada Follow these four easy steps: 4 Read the accompanying Proxy materials. Call the toll-free phone number printed on the enclosed vote instruction form. Have your vote instruction form in hand when you call the toll-free number. Follow the recorded instructions: * Press 1 to vote as the Board recommends * Press 2 to vote each proposal individually Vote by Internet Go to website: www.proxyvote.com Follow these four easy steps: Read the accompanying Proxy materials. Go to website www.proxyvote.com. Have your vote instruction form in hand when you access the website. Follow the simple instructions. ********* Note ********** When voting online, you may also elect to give your consent to have all future proxy materials delivered to you electronically.