GKN Aerospace has two facilities in Hazelwood, just north of the aiport and adjacent to Boeing’s campus. GKN is a UK-based conglomerate that manufactures first-tier assemblies in both composites and metal. They also produce systems as simple as windows to as complex as rocket engines. All new large commercial aircraft contain some GKN-produced parts, from the fuselage to the cockpit glass. GKN parts are in civilian and military aircraft, both fixed- and rotary-winged.