[t6dpilot]

I did back in the late 80's. LHR-JFK 3:19 at FL570 and Mach 2+. You can see the curvature of the earth up there and the windows and fuselage were warm to the touch. As others have said, they are narrow body, single aisle aircraft. Seats are the size of a standard coach seat.

I also witnessed a low flyby and approach into Rochester, NY after the Europeans won the Ryder Cup. I had flown there to attend the event and was waiting at the departure end of the runway when tower cleared me for takeoff. I could see the Concorde circling the golf course and said I would wait for their approach. Sat there and watched the flyby and landing from less than 50 feet away. Pretty amazing.