At what height do planes fly?

Related questions

1. What causes Air France 447 Crash?
2. How many planes are in the air right now?
3. Where is the safest place to sit on an airplane?
4. What caused the Concorde to crash?
5. How many Airbus a320s have crashed?
6. Is Boeing 777 200 Safe?
7. Which airline has crashed the most?
8. Why did Concorde fly so high?
9. Has Ryanair ever had a crash?
10. How much does it cost to deice a plane?

Tags

1. #altitudes
2. #minutes
3. #cruising
4. #higher
5. #safety
6. #altitude
7. #aircraft
8. #miles
9. #present
10. #planes
11. #issues
12. #between
13. #flight
14. #about
15. #according
16. #commercial
17. #first
18. #beckman
19. #reach
20. #typically
21. #usually
22. #their