Spirit AeroSystems Holdings, Inc. is a non-original equipment manufacturer (OEM), aircraft parts designer and manufacturer of commercial aero-structures. The Company is also a supplier of aero-structures. The Company operates through three segments: Fuselage Systems, Propulsion Systems and Wing Systems. The Fuselage Systems segment includes the development, production and marketing of forward, mid and rear fuselage sections and systems. The Propulsion Systems segment includes the development, production and marketing of struts/pylons, nacelles (including thrust reversers) and related engine structural components. The Wing Systems segment includes the development, production and marketing of wings and wing components (including flight control surfaces), and other miscellaneous structural parts. The Company's maintenance, repair and overhaul (MRO) services include repair stations that provide complete on-site repair and overhaul.