Do planes fly lower at night?

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  1. #higher
  2. #which
  3. #there
  4. #aviation
  5. #general
  6. #fewer
  7. #claimed
  8. #aircraft
  9. #hypoxia
  10. #supposed
  11. #friends
  12. #below
  13. #altitude
  14. #recommends
  15. #night
  16. #lower
  17. #pressure
  18. #reason
  19. #ground
  20. #daytime
  21. #makes
  22. #prevent
  23. #molecules