What does Yyz mean in Rush song?

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Tags

1. #verify
2. #unique
3. #lester
4. #airport
5. #assigned
6. #being
7. #tuned
8. #international
9. #roughly
10. #transmitter
11. #pearson
12. #their
13. #toronto
14. #transmitted
15. #radios
16. #pilots
17. #navigational
18. #where
19. #always
20. #every
21. #letter
22. #properly