Boom Supersonic's XB-1 demonstrator nears supersonic flight with record fourth test
Boom’s XB-1 aircraft, a prototype for the upcoming Overture supersonic airliner, completed its fourth test flight on September 21, 2024, progressing toward supersonic speeds.
Mach 0.63, so you don’t have to click the link.
Record test, in that it flew faster than it had ever flown.