Which shuttle flew the most missions?

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Tags

1. #fleet
2. #orbiter
3. #youngest
4. #built
5. #total
6. #missions
7. #logging
8. #challenger
9. #launched
10. #spaceflying
11. #maiden
12. #endeavour
13. #miles
14. #replacement
15. #career
16. #odometer
17. #flight
18. #shuttle
19. #course