WOOD DALE, Illinois, January 3, 2019 — AAR (NYSE: AIR) today announced that its Board of Directors has appointed Sean Gillen as Vice President and Chief Financial Officer, effective January 7, 2019. Mr. Gillen will succeed Michael Milligan and will report to President and Chief Executive Officer John Holmes. He will have responsibility over the financial, accounting, tax, treasury and investor relations functions at AAR.

Mr. Gillen joins AAR from USG Corporation (NYSE: USG), a construction materials company based in Chicago with annual net sales of $3.2 billion, where he served as Vice President and Treasurer. Prior to USG, Mr. Gillen spent nine years in investment banking with Goldman Sachs in their Global Industrials Group.

Mr. Holmes commented on Mr. Gillen’s appointment, “We are thrilled to add Sean to our deep and experienced management team. Sean is an exceptional talent with significant corporate finance, M&A and investor relations expertise. Sean is a strong and principled strategic thinker and will play a major role in helping us drive our business growth strategy.”

Mr. Holmes also thanked Mr. Milligan for his service, noting that “Mike was a steady hand who contributed to AAR’s continued financial strength during his tenure as CFO. It has been a pleasure to work with Mike.”

Mr. Gillen said, “I am very excited to join AAR, a dynamic organization with a strong track record and tremendous future. I look forward to working together with John and the management team to continue to deliver superior results for AAR’s customers, employees and shareholders.”