How do pilots communicate with each other?

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Tags

1. #other
2. #using
3. #radio
4. #instead
5. #traffic
6. #think
7. #civil
8. #messages
9. #control
10. #sometimes
11. #aircraft
12. #communicate
13. #would
14. #input
15. #pilot
16. #system
17. #normal
18. #often
19. #pilots
20. #unknown
21. #operations
22. #frequency