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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.
A group of aviation experts has unveiled plans for a supersonic speed plane named Boom, which is being developed as a replacement for Concorde. Boom planes will travel 2.6 times faster than any other aircraft, up to speeds of 1,451 miles per hour â Concorde's top speed was in the region of 1,350 miles per hour. Each vessel will have 40 seats in two rows on either side of the aisle, and will allow passengers travel from London to New York in under three hours thirty minutes.