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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.
In other words, Airbus just patented a hypersonic jet. Airbus expects the jet to reach speeds as high as Mach 4.5 â or 4 1/2 times the speed of sound. According to PatentYogi's Deepak Gupta, this means the Airbus jet could make the trip from London to New York in just one hour. That's a significant improvement over the 3 1/2 hours it took for the now retired Mach 2 Concorde to make the same trip.