Boom hopes its breakthrough will allow supersonic flights over land, making US coast-to-coast flights 90 minutes faster.

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.

According to the US company, the most recent and final test flight of XB-1 on February 10 also achieved supersonic speeds without making a boom. Boom Supersonic plans to apply the lessons learned from the XB-1 test flights to its future commercial airliner,