Spirit AeroSystems is a manufacturer and supplier of aerostructures for commercial and defense aerospace programs. It operates in three segments: Commercial, Defense and Space, and Aftermarket. The Commercial segment offers design and manufacturing of flight decks, passenger cabins, cargo areas, mid and rear fuselage sections, floor beams, nacelles, struts, pylons, etc. The Defense and Space segment specializes in producing fuselage, strut, nacelle, and wing aerostructures for government defense programs as well as fixed wing aircraft aerostructures, rotorcraft aerostructures, and other products. The Aftermarket segment provides MRO services, repairs for flight control surfaces and nacelles, engineering services, etc.