It’s possible that this has been there forever and I’ve missed this on the Gogo portal. But, I’ve noticed the last few times I’ve logged in on an American Airlines flight, they’re offering a free movie (you don’t have to purchase WiFi to get access):
I wasn’t logged in at the time, either, so you don’t need to be a monthly Gogo subscriber. This has been on a handful of routes over the past few weeks, so can’t verify how widespread it is. I’ve watched a handful of movies on the Gogo service over the past few years and all streamed just fine.
When United was rolling out service last year they offered a menu of free content to anyone who had their updated app. I haven’t had a ton of flights with working WiFi lately so I haven’t bothered checking if free movies are still part of the offering there.
So, if you’re looking for free entertainment on your next flight and the antics of your fellow passengers aren’t entertainment enough, consider this option!