Boom Supersonic's XB-1 Breaks Sound Barrier In Two Historic Test Flights
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On January 28, 2025, XB-1, an experimental aircraft built by US company Boom Supersonic, became the first privately built jet to fly faster than the speed of sound. To prove this was not a fluke, test pilot Tristan Brandenburg flew around for two more supersonic runs over California’s Mojave Desert before returning to land.