NASA has selected Lockheed Martin to build an X-plane to demonstrate that sonic boom noise can be reduced to a level low enough to lift bans on commercial supersonic flight over US land. NASA believes the low-boom demonstrator—its first clean-sheet manned X-plane in decades—will pave the way for development of quiet supersonic transports by US industry once the overland flight ban has been lifted and replaced by sound-based certification rules. The Low Boom Flight Demonstrator ...

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