Why are taxes and fees so high on flights?

Related questions

1. Will flights get cheaper if I wait?
2. What does Travelocity cancellation plan cover?
3. Are plane tickets cheaper on Tuesdays?
4. Is it cheaper to book Spirit Airlines at the airport?
5. Do flight prices include tax?
6. Are tickets cheaper at airport?
7. What does Spirit charge for bags?
8. What is the Spirit $9 Fare Club?
9. What happens if you don't buy seats on Spirit?
10. What is a 9/11 security fee?

Tags

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2. #airport
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6. #airline
7. #service
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16. #domestic
17. #percent
18. #charge
19. #ticket
20. #flights
21. #which
22. #overseas