What do fare class letters mean?

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Tags

1. #availability
2. #agents
3. #flexibility
4. #accrue
5. #airline
6. #miles
7. #travel
8. #ticket
9. #change
10. #systems
11. #flight
12. #information
13. #track
14. #tickets
15. #reservation
16. #costs
17. #class
18. #letter
19. #classes
20. #amount
21. #denotes
22. #airlines