X-43A Hypersonic Scramjet Flight Mach 7 2004 NASA Hyper-X Program Highlights from the second and third test flight of the X-43A hypersonic aircraft. Note: in the third flight test the speeds of Mach 10 (7,310 mph) were achieved by the X-43 hypersonic aircraft. The X-43 is an unmanned experimental hypersonic aircraft with multiple planned scale variations meant to test various aspects of hypersonic flight. It was part of NASA's Hyper-X program and has set several airspeed records for jet-propelled aircraft. The X-43 is the fastest aircraft on record at approx. 7000 miles per hour (10,461 km/h). The initial version, e
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