On Oct. 3 1967 the North American X-15A-2 serial number 56-6671 hypersonic rocket-powered research aircraft achieved a maximum Mach 6.72 piloted by Major Pete Knight. Operated by the United States ...

The X-15A-2, an experimental, rocket-powered aircraft, reached a speed of 4,520 mph on October 3, 1967. It was launched in mid-air from under B-52 bomber plane, according to Guinness World Records.

North American X-15A-2, serial number 56-6671, is at the United States Air Force Museum, Wright-Patterson AFB, Ohio. The X-15-3, serial number 56-6672, crashed on November 15, 1967, resulting in ...

It was the latest failure for the waverider program. A test flight last year ended prematurely with an X-15A trying to restart its engine until it plunged into the Pacific Ocean. During the first ...