What means OK to board?

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Tags

1. #issue
2. #validated
3. #check
4. #system
5. #short
6. #paper
7. #entered
8. #message
9. #against
10. #allow
11. #flight
12. #means
13. #boarding
14. #number
15. #inspected
16. #airline
17. #staff
18. #passport
19. #based
20. #board
21. #stamped
22. #reservation