McDonnell Douglas was a very major American aerospace manufacturer and defense contractor, formed through the merger of McDonnell Aircraft and Douglas Aircraft in 1967. Based out of St. Louis, Missouri, McDonnell Douglas produced a large number of very famous commercial as well as military aircraft. Their military aerospace platforms have included the likes of the KC-10 Extender, F-15 Eagle, F-15E Strike Eagle, F-4 Phantom, CF-18 Hornet, A-12 Avenger II, and F-18 Super Hornet, just to name a few.