During the second supersonic flight of the XB-1 technology demonstrator today, the jet exceeded Mach 1 three times without a boom being detected by microphones on the desert floor below.

When the experimental XB-1 aircraft achieved supersonic speeds on a test flight, it did not create a disruptive sonic boom – ...

Boom’s XB-1 reached Mach 1.112, after 10 years of planning and a year of flight tests. Up next: its Overture supersonic ...

Boom Supersonic broke the sound barrier again Monday, after a successful flight last month. On Feb. 10, Boom Supersonic performed another supersonic flight with its “demonstrator aircraft,” the XB-1.