Boom Supersonic, the American company building what promises to be the world’s fastest airliner, broke the sound barrier for its first time with a test flight in Mojave.

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

Boom ‘son of Concorde’ in bid to fly supersonic for first time The 'Son of Concorde' XB-1 jet is set to take off on its inaugural supersonic flight today, where it will break the sound barrier for the first time.