Why did Concorde fly so high?

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Tags

1. #supersonic
2. #reasons
3. #altitude
4. #cannot
5. #environmental
6. #heating
7. #their
8. #concorde
9. #altitudes
10. #other
11. #speeds
12. #lower
13. #concerns
14. #flights
15. #actually
16. #below
17. #higher
18. #maintain