1) How many Concorde airframes were built?
Twenty-two.
Two static-test airframes.
- One at Toulouse, for purely static tests, and tests such as vibration and flutter.
That one is sadly rotting away in the Ailes Anciennes aircraft museum storage area exposed to the Toulouse weather...
Left Upper Wing Skin
Right hand passenger window, rear fuselage
Seat tracks, forward cabin looking aft
At least it was in 2008, maybe it has been scrapped in favor of the A350 production line by now.