Something like stardew valley , golf story and sports story would suit a plane journey quite well. Although as others have stated I've never found the switch Has held my attention for that long and I prefer to just read or try and sleep on long flight.
Best of luck finding something suitable
Edited to say I've been enjoying paper Mario 64 on nso and that might be good but I can't remember if nso can be accessed offline.
I frequently have to nodd and smile along to people trying to tell me an illness that hospitalised and almost killed my brother didn't exist or was overreacted to . It's easier than trying to change minds at this point.