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FAA proposal: Supersonic airliners can fly over US cities if they’re quiet

New US rules would legalize quiet supersonic flights without the sonic boom.

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NASA's X-59 "frankenjet" tests supersonic flight without the sonic boom

NASA’s quiet supersonic flight tests could eventually go on a national tour.

Features Tech Lockheed Martin NASA sonic boom sonic booms supersonic flight supersonic travel X-59 x-plane