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.

If you've been keeping tabs on aviation news as of late, you saw that Boom Supersonic just recently broke the sound barrier with its XB-1 demonstrator aircraft. Oddly enough, no one on the ground heard a thing during its "boomless" cruise.

Boom Supersonic says its XB-1 aircraft achieved supersonic flight without an audible sonic boom on the ground below. CEO Blake Scholl hopes supersonic passenger flight will eventually be allowed in the U.