NASA, sound barrier and supersonic jet

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.
Despite traveling at a top speed of Mach 1.12, no associated boom was picked up. “XB-1 broke the sound barrier three times during its first supersonic flight – without an audible boom ...
Two weeks ago, Boom Supersonic’s XB-1 demonstrator plane made history when it broke the sound barrier over the continental United States, reaching 750 miles per hour (Mach 1.12) near Barstow, ...