The X-43 was an unmanned experimental hypersonic aircraft with multiple planned scale variations meant to test various aspects of hypersonic flight. It was part of the X-plane series and specifically of NASA's Hyper-X program. It set several airspeed records for jet-propelled aircraft.
The X-43 is the fastest aircraft on record at approximately 7,000 miles per hour (11,000 km/h).
A winged booster rocket with the X-43 placed on top, called a "stack", was drop launched from a larger carrier plane. After the booster rocket (a modified first stage of the Pegasus rocket) brought the stack to the target speed and altitude, it was discarded, and the X-43 flew free using its own engine, a scramjet.
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