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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.
Share to: Depending mainly on payload (how heavy the plane is), the jumbo jet takes off at speeds in the range of 180 to 220 mph (250 to 320 km/h), climbs at about 285 mph under 10,000 â¦ feet and from there it accelerates as it goes higher.