Flown by Boom Supersonic’s chief test pilot, Tristan “Geppetto” Brandenburg, the aircraft called XB-1 reached an altitude of 35,290 feet before accelerating to Mach 1.122, or 750 mph ...

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Boom Supersonic’s XB-1 demonstrator plane just went supersonic in the skies over California’s Mojave Desert, making it the first civil aircraft to break the sound barrier. The American startup ...

We visited Boom Supersonic's hangar in Mojave, California, as the company prepared to break the sound barrier with its XB-1 ...