The 2 airlines I flew recently allow you to download an app inflight that gives you access to their entertainment on your phone. For a while it was only 3 movies. But the last 2 times I flew it was access to like 15 movies and a few tv shows. (Free, there are many more for a few dollars as well as a stupid expensive wi-fi plan)
Delta and American I believe.
It was a decent chunk of free movies. But good god the seats were so cramped. Everything's hurting