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It could reach a top speed of 4,520 miles per hour (7,274 km/h), or Mach 6.72. During the X-15 program, 13 flights by eight pilots met the Air Force spaceflight criterion by exceeding the altitude of 50 miles (80 km), thus qualifying these pilots as being astronauts.
The first flight at faster than three times the speed of sound occurred on 27 September 1956. The aircraft was the Bell X-2 and the pilot was Captain Milburn Apt. The Bell X-2 was launched from a specially-modified Boeing B-50 at 31,800 feet. It achieved a speed of Mach 3.196 (2,094 mph).