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There are a couple of reasons why you can't open an airplane door mid-flight ... either a twin-engined Convair or a four-engined Douglas DC-6 or DC-7. All of which would have been pressurized.

Post-1945, Douglas Aircraft Corporation acknowledged ... in an all-economy passenger configuration. The DC-8-62 had a fuselage stretched 6 feet 8 inches and 3-foot wingtip extensions for extra ...

Edwards took Douglas DC-8-43 no. N9604Z for a test flight at Edwards Air Force Base in California. The aircraft exceeded Mach 1—the only intentional supersonic flight by an airliner other than ...