What altitude do jet routes start?

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Tags

1. #start
2. #united
3. #altitudes
4. #including
5. #ground
6. #above
7. #letter
8. #names
9. #figure
10. #level
11. #victor
12. #using
13. #approximately
14. #states
15. #airways
16. #called
17. #cover
18. #altitude
19. #navigated
20. #navaids