Why is Montreal airport called Yul?

Related questions

1. Is Dorval airport the same as Trudeau?
2. What is Yvr in Canada?
3. Is Scarborough considered Toronto?
4. Do Toronto Raptors pay Canadian taxes?
5. What does Rush YYZ stand for?
6. What is a nickname for Toronto?
7. Are there 2 airports in Montreal?
8. Is Toronto a good tourist destination?
9. Which is the best airport to fly into Montreal?

Tags

1. #designations
2. #frequency
3. #reason
4. #codes
5. #formerly
6. #therefore
7. #montreal
8. #canadian
9. #kirkland
10. #designation
11. #airport
12. #beacon
13. #dorval
14. #morse
15. #airports
16. #letters
17. #according
18. #248khz
19. #transmits
20. #continuously
21. #historical