Boom Supersonic's XB-1 jet sets new speed record during 7th test flight
During the Nov. 5 test flight, which lasted 55 minutes, XB-1 reached an altitude of 23,015 feet (7,015 meters) and a new top speed of 629 mph (1,012 kph). This means the aircraft reached Mach 0.82, marking a major milestone in its progress toward crossing the threshold of Mach 1 and breaking the sound barrier .