• Pikmin 3 is out not sure if you already played that.
• Luigi's mansion 3 was fun for me on a flight.
• I'm a big fan of civilization just bc it's turn based and I don't constantly have to pay attention to it.
• Crash Bandicoot could be good since it's a game pack

I just saw that howlongtobeat.com puts oxenfree 1 around 4.5 hours for a main story playthrough, and oxenfree 2 at 6 hours. Could be a cool 1, 2 punch and knock out both games. They have great reviews and are more narrative puzzlers.

I also was recommended Dan the Diver recently, but that's PC only for now, so if you have a steam deck you could do that one.

Well, if you live metroidvania you probably already know all the good ones already.

Yes, Your Grace was a fun little story-driven thing. Or go big and branch out, something like Fire Emblem could easily soak up numerous trans-continental flights. If you'll get in-flight wifi, something like Mario Maker 2 could also fit, since you've got some platforming chops. It's basically endless content.