How does plane WiFi work?

I saw this

https://gizmodo.com/united-airlines-ceo-promises-theyre-working-on-the-shit-1834235189?utm_medium=socialflow&utm_campaign=socialflow_gizmodo_facebook&utm_source=gizmodo_facebook

And I read that it essentially communicates with a satellite, beaming that signal back down to Earth, and then back up to the plane, however that's quite high level

Does anyone know exactly how plane WiFi does work? Especially given that data communication on your phone stops at that height?

Does anyone work in wireless networking?