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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.
4. MiG-25 Foxbat. This jet has an average speed of about Mach 2.83. it is a popular type of jet considered as the fastest jet fighter the world has ever have, and up until now it is still in active service. This is primarily used for high altitude flights.