Hello Mr. Garry B,
Just wanted to clarify, the Concord used to fly at low altitude just after Takeoff and attain speed of Mach 1+ (at that altitude, Not sure), this must have been the main reason to avoid it flying over a city (I guess).
But a Space Shuttles flies at Mach25 at extreme altitude, stratosphere ?, So I guess, it should not cause any problem ?
Pls correct me if I am wrong.
Regards
Baliga