Spirit AeroSystems Holdings, Inc. engages in the design and manufacturing of aero-structures. It offers structural components, such as fuselage, propulsion, and wing systems. The company's fuselage systems include forward, mid, and rear fuselage sections; propulsion systems comprise nacelles, struts/pylons, and engine structural components; and wing systems consist of wings, wing components, and flight control surfaces. Spirit AeroSystems also designs and manufactures structural components for military aircraft, including low observables that are radar absorbent and translucent, and other military products. In addition, it offers aftermarket services, such as spares, maintenance, repair, and overhaul, as well as engages in the sale of natural gas. 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.