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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.
Inside the massive cowlings of the plane are two dual-channel, fadec-controlled Rolls-Royce AE3007C2 engines that bring the X+ up to a maximum operating speed of Mach 0.935, a hair past the Gulfstream G650's Mach 0.925 â a speed that allowed the Savannah, Georgia-based company to steal the top spot from the Citation X for a few years.