Reminder: Concorde 1st flight was 2nd March 1969. Civilian supersonic flight was completely routine until 2003. You could book pure "pleasure cruises" doing a lap of the Bay Of Biscay, eating lunch, and returning to the same airport. IT was not "built by the government" either. It was built by Sud Aviation (later Aérospatiale) and the British Aircraft Corporation (BAC), both private companies. It was funded by government.