AAR Corp. engages in the provision of products and services to commercial aviation and government and defense industries. It operates through the following segments: Aviation Services and Expeditionary Services. The Aviation Services segment consists of aftermarket support and services businesses that provide spares and maintenance support for aircraft operated by commercial and government/defense customers. The Expeditionary Services segment involves in delivery of airlift services; and design and manufacture of pallets, shelters, and containers used to support the military's requirements for a mobile and agile force. The company was founded by Ira A. Eichner in 1951 and is headquartered in Wood Dale, IL.