What do Airport codes stand for?

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Tags

1. #location
2. #world
3. #defined
4. #international
5. #airport
6. #metropolitan
7. #three
8. #transport
9. #designating
10. #letter
11. #station
12. #around
13. #association
14. #simply
15. #known
16. #identifier
17. #airports
18. #areas