X-43A Hypersonic Scramjet – NASA – Hypersonic X-43A – The Fastest Jet In The World – 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 Mach 9.2 (7,000 mph) (11,000 km/h).
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