this post was submitted on 09 Mar 2025
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[โ€“] [email protected] 22 points 1 day ago (1 children)

My heard-from-online understanding is that this is a combination of multiple factors:

  • planes tend to route over major airports so that there's always an emergency landing site nearby
  • there are restricted airspaces that commercial planes cannot fly through
  • the most direct path sometimes isn't the best path. There are stable wind channels in certain areas of the world and it's more efficient to ride the wind channel than to fly in a straight line
[โ€“] [email protected] 7 points 23 hours ago
  • planes tend to route over major airports so that there's always an emergency landing site nearby

I think you've got it right. This flight path is basically:
SFO > LAX > PHX > ELP > AUS > IAH