A sleek white aircraft became the first independently developed jet to break the sound barrier ... about 11 minutes of taking off, according to Boom Supersonic and live video of the test flight.
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 ...
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