Boom’s XB-1 jet breaks sound barrier on first supersonic flight - Boom’s inaugural XB-1 supersonic test flight reached speeds of more than 850 miles per hour

A supersonic passenger jet dubbed the ‘New Concorde’ travelled faster than the speed of sound for the first time during a test flight today. Some 34,000ft above California’s Mojave Desert, the XB-1 prototype reached speeds of 844 miles per hour – more than the 770mph speed of sound.