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Bell Aircraft Corporation X-1-1
Credit: NASA Photo / USAF photo by Lt. Robert A. Hoover
The Bell Aircraft Corporation X-1-1 in flight with the shock wave pattern in the exhaust plume visible. The X-1 series aircraft were air-launched from a modified Boeing B-29 or a B-50 Superfortress bombers. Lasting from 1946 to 1958, the project’s goal was breaking the sound barrier, which was achieved on Oct. 14, 1947.