Why Flight tickets are so expensive?

Related questions

1. How far in advance should you buy international airline tickets?
2. When's the best time to buy international airline tickets?
3. Is it cheaper to fly or train in Europe?
4. Are flights within Europe cheap?
5. Is Europe cheaper in winter?
6. What is the cheapest month to fly to Europe?
7. Are flights cheap in Europe?
8. What is the best time to visit Europe?
9. Does it snow in Europe?
10. Which Scandinavian country is the cheapest?

Tags

1. #ticket
2. #prices
3. #travelers
4. #airlines
5. #demand
6. #number
7. #certain
8. #based
9. #passengers
10. #factor
11. #airline
12. #seats
13. #raise
14. #business
15. #these
16. #minute
17. #types