Boom Supersonic's XB-1 demonstrator craft will break the sound barrier for the first time during a Jan. 28 test flight, and you can watch the action live.

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Boom Supersonic's XB-1 demonstrator jet became the first U.S.-made civilian supersonic jet to break the sound barrier. The independently funded XB-1 reached a speed of Mach 1.122, or about 750 mph ...