What is meant by OK to board?

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Tags

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