The countdown has begun for the XB-1’s “historic” first supersonic test flight that should break the sound barrier, according ...
Boom Supersonic's XB-1 demonstrator craft could become the first commercial jet to break the sound barrier since Concorde ...
where Chuck Yeager became the first man to break the sound barrier in level flight, in the X-1 aircraft in 1947. Reaching an altitude of 35,290 ft (19,756 m), the Boom XB-1 became not only the ...