Oh, I don't know about play-dough my DS-3 made a mess with that, but maybe it would be ok for an older child. He liked I Spy books, sticker books and themed magnetic boards. We bought a nice "ocean life" one at Epcot for the plane ride home and took turns creating scenes and hiding a little treasure chest. My older son likes to just read or listen to cd player. Another vote for snacks, that always seems to keep them happy. Also, I brought small sports bottles for the drinks they serve on the plane, (it's so easy to bump the tray and spill them)