NASA’s silent X-59 jet can break sound barrier with almost no noise, take passengers from NYC to London in 3½ hours

NASA’s sleek and quiet supersonic jet — which is built to reach speeds of up to 925 mph without producing a loud sonic boom— ...
Jalopnik

See The Boom XB-1 Rip Through The Air As It Breaks The Sound Barrier

Boom Supersonic broke the sound barrier in late January with its XB-1 test jet, paving the way forward in the startup's efforts to build its own supersonic airliner. Boom and NASA released a unique ...
SlashGear

When (And Why) Are Military Aircraft Allowed To Break The Sound Barrier?

The sound barrier is something many people have heard of, but few understand, as it's somewhat of a misnomer. The speed of sound is known as Mach 1 (767 mph), and when an object moves beyond this, ...