Why do some airports not have AK?

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Tags

1. #station
2. #letter
3. #small
4. #indicates
5. #without
6. #because
7. #airport
8. #unique
9. #airports
10. #hence
11. #necessarily
12. #actually
13. #designator
14. #weather
15. #identifier
16. #location
17. #service
18. #official