The composite wings are manufactured and assembled at a purpose built factory at the Bombardier Aerostructures and Engineering Services (BAES) site in Belfast, Northern Ireland. Meanwhile, the aft fuselage and cockpit are built in Bombardier's Saint-Laurent Manufacturing Centre in Quebec, with final assembly occurring at Mirabel, Montreal, Quebec. While several major elements of the aircraft, such as the centre wing box and doors, are manufactured internally, many other components have been contracted out, namely: Liebherr for the landing gear and pneumatics; UTC Aerospace for the electrical system and lighting; Goodrich for the nacelle; Meggitt for the wheels and brakes, Michelin for the tires; Spirit for the pylons; Honeywell for the APU; and PPG supplies the windows. In 2010, Ghafari Associates was retained to develop the Montreal manufacturing site to accommodate the aircraft production.