Spirit AeroSystems, Inc. , based in Wichita, Kansas, is the world's largest first-tier aerostructures manufacturer. The company builds several important pieces of Boeing aircraft, including the fuselage of the 737, portions of the 787 fuselage, and the cockpit section of the fuselage of nearly all of its airliners. Spirit also produces fuselage sections and front wing spars for the Airbus A350. Spirit's main competition comes from Triumph Aerostructures - Vought Aircraft Division, Collins Aerospace, Leonardo, and Kawasaki Heavy Industries. Spirit was formed when Boeing Commercial Airplanes sold its Wichita division to investment firm Onex. Boeing Defense, Space & Security retained its military business in Wichita, which lay on neighboring land, until Boeing sold most of those properties to Air Capital Flight Line. The Wichita division was responsible for construction of many important aircraft in Boeing's history, including the B-29 Superfortress, B-47 Stratojet, and B-52 Stratofortress. Spirit can trace its legacy back even further to Stearman Aircraft, which was founded on the same site; Stearman later became part of Boeing. Spirit also includes North American Aviation's former Tulsa and McAlester facilities , as well as additional facilities in Kinston, NC, Prestwick, Scotland, Saint-Nazaire, France, and Subang, Malaysia.