Former Air Force Plant 3, Oklahoma

At the southeast corner of the Tulsa International Airport is a former aircraft plant once known as Air Force Plant 3, with a ¾ of a mile-long main building. During World War II, it was a production plant for Douglas aircraft bombers, and after the war it was reactivated to make B-47s and B-66s. The facility continued to be used to make and service military aircraft and related hardware by McDonnell Douglas and Rockwell until 1996, when Boeing took it over. Much of the site is now used as a manufacturing and storage site for school buses, while next door, Spirit Aero Systems uses a former Boeing and Rockwell plant to make parts for Boeing airliners and military aircraft.