Good question:) Usually I only have short flights ( <3-4 hours) and no Internet access during those, so for this I have a folder on my laptop called "To read — offline" with a decent selection of books and saved versions of articles etc, usually work-related. I try to fill this folder in advance, so it doesn't add to last-minute travel anxiety:)
Also, if you're traveling for a conference/ business meeting, going through your slides and demos one more time never hurts. One more thing to do, which is relaxing and useful at the same time, is to clean up and organize your notes (or phone screenshots, if you're like me 😄)
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