sound barrier

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Remarkable NASA photo captures U.S. civilian jet breaking the sound barrier: "Makes the invisible visible"

Boom Supersonic's XB-1 jet breaks sound barrier 3 times on final test flight (video, photos)

Boom Supersonic XB-1 jet breaks sound barrier on historic test flight (video)

Boom Supersonic to break sound barrier during historic test flight today: Watch live

Boom Supersonic's next-generation XB-1 passenger plane 1 step away from breaking the sound barrier