The team at Boom Supersonic are determining whether a 12th test flight of its XB-1 demonstrator is needed before undertaking its first attempt at breaking the speed barrier. 

On January 10, 2025, XB-1 reached speeds of Mach 0.95 during a 44-minute flight over the Mojave Desert with Chief Test Pilot Tristan “Geppetto” Brandenburg at the controls.  

The 11th XB-1 test flight also saw the aircraft climb to 29,481 feet as it closes in on supersonic speeds. 

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