Concorde wasn't $400 more than an equivalent flight. It was >$11,000 more than a similar comfort premium economy class seat, and that's after the British government had underwritten the losses from the design program (around $2000 per passenger per flight in today's money)
Certainly. But sandworm101 asked about regular supersonic flights as a general concept, and not specifically about Concorde.
FWIW, the full economics must note that people with a lot of money are more likely to hop on a business jet and get point to point service. When Concorde was designed, business jets that could fly non-stop between US and Europe had just barely entered the market. (The Gulfstream GII, May 4, 1968 vs. first demonstration flight of the Concorde 2 March 1969.)
Concorde wasn't $400 more than an equivalent flight. It was >$11,000 more than a similar comfort premium economy class seat, and that's after the British government had underwritten the losses from the design program (around $2000 per passenger per flight in today's money)