NASA, XB-1 and Sound Barrier

Boom Supersonic's XB-1 jet went out in style on Monday (Feb. 10). The XB-1 broke the sound barrier three times during its 13th and final test flight, which lifted off Monday from the Mojave ...
Boom Supersonic test pilot uses precise maneuvering to help NASA snap a photo of the firm’s civil supersonic jet in flight.
"XB-1 broke the sound barrier three times during its first supersonic flight – without an audible boom," said Blake Scholl, Boom Supersonic's Founder and CEO.