Couple of neat things to know about the Concorde... It never cruised "straight and level". After take off, it climbed steadily, but upon reaching maximum altitude (60,000 feet above mean sea level (MSL)) it immediately began a carefully planned descent so as to arrive at the approach altitude at a predtermined point about 100 miles out.
Additionally, it was originally planned without passenger windows, since a failure of one would be catastophic. It was planned for there to be TV cameras "looking out", but planning determined passengers would suffer from claustrophobia.
Had the aircraft been able to fly over land economically, it might still be around. However, it could only arrive at East Coast (US) cities, since the sonic boom while traversing the continental U.S. was unacceptable.
The Concorde normally measured 204ft in length - but stretched between six and ten inches in-flight due to heating of the airframe. (Which was the reasonl of course, for the 'drop nose shield... to protect the front windows from heat)...
Missed by all...