What is a 9/11 security fee?

Related questions

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3. Do flight prices go down closer to the date?
4. What is the Spirit $9 Fare Club?
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6. Are tickets cheaper at airport?
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Tags

1. #monday
2. #traditionally
3. #revenue
4. #passenger
5. #september
6. #journey
7. #airport
8. #collected
9. #nonstop
10. #deficit
11. #until
12. #charged
13. #security
14. #round
15. #federal
16. #measures