The XB-1 prototype accelerated smoothly to reach as fast as Mach 1.11 at about 35,000 feet at 11:33 a.m., 11:38 a.m. and 11:45 a.m. Mach 1 is equal to the ...

Boom Supersonic's XB-1 breaks sound barrier in test flight XB-1 test ... Last year, it completed construction on its Overture Superfactory in Greensboro, North Carolina, where it plans to build ...

Boom is convinced it can overcome the barriers that grounded the Concorde and make supersonic travel affordable and greener.

Boom Supersonic's XB-1 demonstrator jet became the first U.S.-made civilian supersonic jet to break the sound barrier ... Boom said it completed construction on its Overture Superfactory in ...