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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.
Published on Tuesday, 02 April 2013 15:12. NASA X-43A is an unmanned experimental hypersonic aircraft designed by NASA. It is the fastest aircraft ever built, currently holding the fastest flight speed record.rom that moment, the X-43A is powered by its own jet engine. The aircraft uses a scramjet engine, a variant of a ramjet air-breathing jet engine in which combustion takes place in supersonic airflow.