Supersonic jets do not have a place in the future, Willie Walsh, the former boss of British Airways, said, adding that he would not buy them if he still ran an airline as he dismissed a plan by United Airlines to bring them back. Supersonic passenger travel died out with the retirement of Concorde in 2003, but United said earlier in June it agreed to buy 15 ultra-fast jets from Boom Supersonic. "We'll watch with interest but no, I wouldn't be buying it," Walsh told an airlines conference on Thursday.