Skinny seats
What amazes the most when you enter Concorde is how narrow the cabin is, and if there are seats, how small they are. Especially when you consider they cost significantly more than the first class seats on other aircraft.
Production Concordes had a higher, more comfortable, air pressure in the cabin than even the modern 787. It was roughly equivalent to the air pressure at 5,500ft/1,700m, while the 787’s cabin is equivalent to 6,000/1,800 and most commercial aircraft is 8,000/2,400m.