I imagine checking the weather is an important task for pilots.
[0] https://www.southwestairlinesinvestorrelations.com/news-and-...
I believe they were also the most profitable US airline last year because of how streamlined their entire operation is. They could afford it if they wanted it.
Also, their entire fleet is made up of 737s, so it’s not like large airports get a massive planes (maybe a MAX vs a -700, but still not a huge difference)
Looks like their net margin was about 10%. Which isn't super low. But it's no 30% plus like many of the tech giants.