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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 Wright brother's best flight on December 17, 1903 covered only 852 feet at a speed of about 34 mph. Today, aircraft routinely fly across oceans at speeds in excess of 1000 mph. The space shuttles circles the globe at over 15,000 mph. Fastest Ever. The century following Kitty Hawk has been filled with amazing accomplishments in aviation, but it was the first dozen years that laid the foundation for this adventure.