Spirit AeroSystems Holdings, Inc., through its subsidiaries, operates as a non-original equipment manufacturer (OEM) that designs and manufactures commercial aerostructures worldwide. It operates in three segments: Fuselage Systems, Propulsion Systems, and Wing Systems. The Fuselage Systems segment develops, produces, and markets forward, mid, and rear fuselage sections and systems primarily to aircraft OEMs; and provides related spares, as well as maintenance, repair, and overhaul (MRO) services. This segment also offers rotorcraft comprising forward cockpit and cabin. The Propulsion Systems segment engages in the development, production, and marketing of struts/pylons; nacelles, including thrust reversers; and related engine structural components principally to aircraft or engine OEMs, as well as provides related spares and MRO services. The Wing Systems segment develops, produces, and markets wings and wing components consisting of flight control surfaces; and other miscellaneous structural parts primarily to aircraft OEMs, as well as offers related spares and MRO services. This segment also offers low observables that are radar absorbent and translucent materials; radome new builds and refurbishment; and other military services comprising fabrication, bonding, assembly, testing, tooling, processing, engineering analysis, and training. Spirit AeroSystems Holdings, Inc. serves large commercial airplanes, business and regional jets, and military/helicopter sectors of the aerostructures industry. The company, formerly known as Mid-Western Aircraft Systems Holdings, Inc., is headquartered in Wichita, Kansas. Spirit AeroSystems Holdings, Inc. is a subsidiary of Onex Corporation.