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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 US F-15 Eagle can top out around 2.5 Mach. But the NASA x-43 scramjet can toodle along at 9.6 Mach, but is not a fighter. The Eurofighter approaches a speed of 3.0 Mach. â¦Eurofighter Typhoon is reported in all reasonable sources to fly at about 1,300 mph - that is mach 2.