I may be a bit behind the times, but I have not let my son play with my Android phone very much. He is 3 now and we have a long flight coming up. I would love any recommendations you could offer in case we want it in flight or, worse, we get stuck on the tarmac or in an airport. He has always flown well, but I would like to have it ready just in case. We will have the usual stash of books, toys, snacks, etc. I don't mind paying for a good app if needed.

The only game he has played is Tangrams HD and he really enjoyed it.