YouTube with YouTube Premium
You can watch YouTube offline on an airplane! This is perfect for catching up on your favorite YouTube series, watching video game replays and expanding your learning by watching DIY and e-learning videos. It can also be an epic way to keep your kids occupied on a long flight.
The YouTube app is free, and you don't need to use any tricks to make this work, but you will need to plan ahead and sign up for a trial or a subscription.
With YouTube Premium, you get to watch YouTube ad-free and you also get to watch YouTube offline. While you can use third party apps and other tricks, this is a better option for most users.
YouTube Premium is $11.99 a month and it comes with a free 1 month trial, so you can give it a shot on your next flight without any cost. This includes YouTube, YouTube offline, no ads, YouTube Music Premium and YouTube Originals.