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It's hard to say. Officially, the fastest jet plane ever built is the SR-71 Blackbird, built by Lockheed. It was capable of speeds in excess of 3.5 mach (more than 2,200 miles per hour). It was decommissioned in 1998.
Published on Tuesday, 02 April 2013 15:12. NASA X-43A is an unmanned experimental hypersonic aircraft designed by NASA. It is the fastest aircraft ever built, currently holding the fastest flight speed record.rom that moment, the X-43A is powered by its own jet engine. The aircraft uses a scramjet engine, a variant of a ramjet air-breathing jet engine in which combustion takes place in supersonic airflow.