Boom Supersonic sans Sonic boom

More than 20 years since the final Concorde flight, is a small US start-up now on course to bring back supersonic air travel?
GREENSBORO, N.C. — Boom Supersonic’s XB-1 took its last test flight on Monday. The aircraft started its flight around 1:30 p.m. on Feb. 10. It was the 13th and final flight for the aircraft.