I had the pleasure of flying the Concorde, almost by accident, in the 90s. Yes, I was flying on business, but for some reason I couldn't get a flight on KLM to the Netherlands at all that week and my creative travel agent mused "Hey, do you want to take the Concorde?"

The cost was $3500, which at the time was within a couple of hundred dollars compared to a business-class seat on KLM. Yes, that ticket price wasn't something I'd contemplate for personal travel, and it was a bit discounted at that; but for business travel it certainly wasn't exorbitant.