Executive Change

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549   FORM  8-K/A   CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934   Date of Report (Date of Earliest Event Reported): April 14, 2021   AAR CORP. (Exact name of registrant as specified in its charter)   Delaware   1-6263   36-2334820 (State of Incorporation)   (Commission File Number)   (IRS Employer Identification No.)   One AAR Place 1100 N. Wood Dale Road Wood Dale , Illinois 60191 (Address and Zip Code of Principal Executive Offices)   Registrant’s telephone number, including area code: ( 630 ) 227-2000   Not Applicable (Former name or former address, if changed since last report)   Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:   ¨        Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)   ¨        Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)   ¨        Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))   ¨        Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))   Securities registered pursuant to Section 12(b) of the Act:   Title of Each Class   Trading Symbol(s)   Name of Each Exchange on Which Registered Common Stock, $1.00 par value   AIR   New York Stock Exchange     Chicago Stock Exchange   Indicate by check mark whether the registrant is an emerging growth company as defined in Rule  405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).   Emerging growth company  ¨   If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ¨             Item 5.02. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.   Election of Director   On April 14, 2021, the Board of Directors of AAR CORP. (the “Company”) filed a Current Report on Form 8-K disclosing that it had appointed Ellen M. Lord to the Company’s Board of Directors effective April 14, 2021. At the time of the report, the Company’s Board of Directors had not yet determined on which committees Ms. Lord would serve as a member. Effective September 28, 2021, the Company’s Board of Directors appointed Ms. Lord to the Compensation Committee and Nominating and Governance Committee.   2       SIGNATURE   Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.   Date: September 29, 2021     AAR CORP.       By: /s/ JESSICA A. GARASCIA     Jessica A. Garascia     Vice President, General Counsel and Secretary   3