What does preclearance mean?

Related questions

1. What is the difference between YYZ and YTO?
2. Why do Canadian airports begin with Y?
3. What time does Ottawa airport security open?
4. Are flights Cancelled in Ottawa?
5. Which airport is closer to Niagara Falls Canada?
6. Can I bring my dog to the airport to pick someone up?
7. Can I stay at the airport overnight?
8. What does Yow stand for Ottawa airport?
9. What is preclearance at airport?
10. How many hours before flight can you enter airport?

Tags

1. #approval
2. #voting
3. #related
4. #changes
5. #preclearance
6. #department
7. #justice
8. #seeking
9. #defined
10. #process