I was going to say magnetic sketch board.

Stickers! I found a great sticker book for my 3yo, it had all the legs & mouths and horns & tails of animals and he had to stick them on the right animal. Something like that would pass the time. My nearly 2 yo is happy just sticking stickers all over her hands, pulling them off and sticking them on my hand, then pulling them off and sticking them back on hers LOL.

I've got to find a way to entertain the kids on the plane to Singapore in Feb... 8hrs worth! LOL. Good luck!