American company Boom Supersonic just broke the sound barrier with a civilian plane. What exactly is supersonic travel, and ...

For efficiency reasons, most passenger jets cruise slightly slower ... There was the little-known Russian Tupolev-144 and Concorde, a Franco-British supersonic airliner operated by British Airways ...

It’s now the first piloted non-military aircraft to break the sound barrier since the Concorde was retired from service in 2003. It’s the first step in Boom’s ambitious goal to have supersonic ...