Spirit AeroSystems Holdings, Inc. designs and manufactures commercial aerostructures for aircraft OEMs and engine OEMs worldwide and operates through three segments: Commercial, Defense & Space, and Aftermarket. The Defense & Space segment provides aerostructures for US Government defense programs, fixed wing aircraft aerostructures, missiles, and hypersonics works. The Aftermarket segment offers MRO services, spare parts, and repairs for flight control surfaces and other repair and overhaul services.