I downloaded a movie to watch on the plane. i used my iPad for the download. The movie showed up in my rentals with the little cloud and the down arrow. I pressed that and after a bit my movie had a blue bar that said downloaded. Now I am in the air and a box pops up after I hit the play and states Cannot open this content is not authorized. I just opened my iPad at my destination and the movie will play. what do I need to do to get it to play while in the air?
This is, unfortunately, a problem a lot of folks have had on their iDevices since the 10.2 update. There is no one way that works for everyone. Take a look at this article (https://appletoolbox.com/2016/12/cant-play-videos-after-ios-10-2-update-how-to/) and see if any of the tips work for your iDevice.
Sorry about the trouble and good luck,