A:AnswerYes Amazon sells 10ft headphone extenders for $7-$10. That should be all you need to do what you want if your tv or whatever you are watching has a headphone Jack. Some receivers hav the bigger plug headphone Jack so you may need a alter for that.
A:AnswerYes I would assume so they’re standard headphones with a headphone Jack cable and I’m certain the airlines still have the screens with headphone jack plugs