Why don't you plan out stuff to do? Seems odd. Like bring a book, or a Switch, or some sort of small art project.

Last time I had to fly was January 2016, so the Switch didn't exist. I'd sold my DS shortly before I found out that I'd be flying, so I didn't have portable video games at the time. I just ended up listening to music on my phone, but that doesn't cut it when the flight to your layover airport is 3 hours and the main flight is another 5.