Ask HN: How does Uber know I arrived in LAX while I have airplane mode on?

Android airplane mode doesn't disable GPS (which is receive only), seemingly unlike iPhone. I'm guessing that the Uber app does some geofencing with hard-coded coordinates of popular locations, such as airports - to provide notifications even with cellular/wifi disabled.

GPS still works in airplane mode (technically passively listening to WLAN and cellular would be possible as well, but I don't think any device does that)

Related: Does anyone know how to disable these notifications? It happens every time I fly, and it's becoming annoying.