AAR is a provider of products and services to the aviation and government and defense markets. Co. reports its activities in two business segments: Aviation Services and Expeditionary Services. The Aviation Services segment provides aftermarket support and services for the commercial aviation and government and defense markets. In this segment, Co. also provides inventory management and distribution services, maintenance, repair and overhaul, and engineering services. The Expeditionary Services segment consists of businesses that primarily provide products and services supporting the movement of equipment and personnel by the U.S. and foreign governments and non-governmental organizations.