Boom Promises ‘Boomless’ Supersonic Flights With Debut Airliner Boom Supersonic might have snatched aviation’s holy grail after announcing on Monday that its XB-1 test plane had completed its maiden supersonic flight two weeks ago without producing a sonic boom audible on the ground. The dreaded boom smothered early commercial supersonic flight in the crib. The FAA’s 1973 ban on… Read more…