When can you select seats on Singapore Airlines?

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Tags

1. #flight
2. #before
3. #hours
4. #remaining
5. #choose
6. #singaporeair
7. #counter
8. #airport
9. #seats
10. #check
11. #departs
12. #advance
13. #online
14. #available
15. #selection
16. #select
17. #complimentary