I do 10 hour flights all the time to Brazil. On the airline I usually go on (Air Canada), there's screens at the back of every seat, and they have a 3.5" jack for you to plug your headset in if you have a better pair than the cheap ones they usually provide, Before they renovated the planes, they had the annoying double jack, and screens were in the halls. I actually stashed a lot of movies on my crappy little netbook once back then. I was fortunate to have an outlet next to me.