Some little suction toys is a good idea
Haha yes definitely the suction cup toys! Our baby LOVED these spin toys on Amazon! They suction cup to the window and she still likes to play with them now at home 😂 https://a.co/d/irE5kSj Also I recommend finding (I’m probably gonna butcher the name) those pacifier holder straps/ clips. We used them for her toys that didn’t suction cup to the tray/ window and it saved us from having to pick them up on the floor by just clipping them to the tray or to her.
I made the mistake of letting my baby girl play with her suction toys for weeks before our flight, so when the time came, she was bored of them already. She never got tired of a plastic water bottle or peeking at the people in the row behind us 🥰
Dollar Store had some great options! I got a magnet tin, an etch-a-sketch, coloring books, etc!
We just flew to Japan it was like 13 hours then another 5 hour flight to Philippines. I had a bunch of those teething crackers since my baby puts everything in her mouth