OK so flew two flights this weekend, both with Boeing aircraft and using Viasat. Used a 2017 iPad Pro and iPhone 13 Pro Max, both with iOS 15.1. Was able to see movies, however with some caveats. Please note:
iPhone worked perfectly. Was able to see multiple movies with no issues.
With the iPad it was a bit tricker. When I opened in Safari, movie would play, but it seemed to be taking a lot of processing power. I could not scrub the video, difficult to maximize screen, etc. However, when I used the trackpad on my Smart Keyboard to maximize the video, then everything ran perfectly. I had to do it this way because when I pressed with my finger it would take too long for the iPad to respond. When maximized it was like I was watching a movie downloaded on my device.
Still seems to be an iOS issue since it’s not working 100%, just hope someone is able to solve this soon. Since we’re getting back in the air it would be a shame that Apple devices wouldn’t work with the US’s largest carrier…