The flight is part of a series of demonstration flights showcasing Booms intention to bring commercial supersonic travel back to Americas skyways. The rising costs of supersonic travel were slowly killing the industry even before the Concordeâs final flight in 2003. But private companies and federal agencies are devising ways to repopularize the previously deafening way of getting around, and the recent Boom flight inches the company closer to that goal. The XB 1s eighth flight took place on...