Are IATA airport codes unique?

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Tags

1. #different
2. #unique
3. #cases
4. #requires
5. #consequently
6. #created
7. #codes
8. #letters
9. #designation
10. #designate
11. #because
12. #aviation
13. #contains
14. #therefore
15. #three
16. #airports
17. #since
18. #combinations
19. #possible
20. #limited