> Can't work on a plane

You're now making me imagine setting up a Raspberry Pi as a portable micro-server for your iPad terminal to SSH into, then creating an ad hoc WiFi network on the plane, which you could then connect your iPad Pro to.

Of course that's completely backwards, your terminal has more processing power than the server, plus you'd need a battery for the RPi, and a way to sync your micro-server to your real server.

It would be completely impractical and stupid, but it would be rather funny.