Don’t be bored. Ever.
Be able to watch movies while you wait at the airport, or in the evening when you just need to chill.
And don’t leave the movie choice up to the airlines! We have been on several planes where the on-board entertainment lame, or is not working, or the flight is only 2.5 hours, so they don’t offer any video!
Download the best movies for your trip, or documentaries about the place you are going, which is super helpful.