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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.
Boeing X-51. The Boeing X-51 (or X-51 WaveRider) is an unmanned research scramjet aircraft for hypersonic flight at Mach 5 (3,300 mph; 5,300 km/h), an altitude of 70,000 feet (21,000 m). The aircraft was designated X-51 in 2005. It completed its first powered hypersonic flight on 26 May 2010.