What determines airport elevation?

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5. How does an ISA account work?
6. How do you calculate ISA?
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Tags

1. #accuracy
2. #elevation
3. #reference
4. #determined
5. #aerodrome
6. #countries
7. #airport
8. #runways
9. #above
10. #usable
11. #level
12. #measured
13. #meters
14. #highest
15. #point