Bidspirit auction | North American X-15 NASA Test

North American X-15 NASA Test Pilot A. SCOTT CROSSFIELD Signed RAF Cover. 1984 RAF Test Pilots Series TP35c Signed Cover. American naval officer and test pilot. In 1953, he became the first pilot to fly at twice the speed of sound. He was the first of twelve pilots who flew the North American X-15, an experimental spaceplane jointly operated by the United States Air Force and NASA.