AAR Corp. engages in the provision of products and services to commercial aviation and government and defense industries. It operates through the following segments: Parts Supply, Repair and Engineering, Integrated Solutions, and Expeditionary Services. The Parts Supply segment refers to the sale of used serviceable engine and airframe parts and components and distribution of new parts. The Repair and Engineering segment includes maintenance, repair, and overhaul services across airframes and components, including landing gear. The Integrated Solutions segment relates to fleet management and operations of customer-owned aircraft. The Expeditionary Services segment focuses on the products and services supporting the movement of equipment and personnel. The company was founded by Ira A. Eichner in 1951 and is headquartered in Wood Dale, IL.