I did do two 8 hour flights recently.

Even with a USB port on the chair, the switch just doesn’t hold that kind of charge, plus I got bored anyways and slept half of each.

Either you’re ALREADY binging a game, or I recommend getting some other lower consumption alternative. I had a much better time just playing older games on my Anbernic 353p.

whatever you like and have available.

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.

Okami (old game but a good one one the switch)

Any story of season game on the switch

Rune factory 4 (story of season rpg and also made by the same guy who made the og harvest moon)

Monster hunter (you can play offline)

Hades is my vote. Short runs mean you can take breaks/naps/whatever. Great story telling if you get hooked and want to play for hours.