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Space on MSNBoom Supersonic's XB-1 jet breaks sound barrier 3 times on final test flight (video, photos)The XB-1 broke the sound barrier three times during its 13th and final test flight, which lifted off Monday from the Mojave ...
Boom, the American company building what promises to be the world’s fastest airliner, broke the sound barrier for its first time with a test flight in Mojave, California. The company’s XB-1 ...
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