How high can Predator drones fly?

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Tags

1. #altitude
2. #flight
3. #ideal
4. #lasted
5. #rescue
6. #infrared
7. #predator
8. #making
9. #aircraft
10. #search
11. #camera
12. #longest
13. #signature
14. #hours
15. #human
16. #declassified
17. #identifying
18. #enhanced
19. #minutes
20. #capability
21. #digitally