Games to play on a plane?

I'm going to be taking a long indirect flight with a four hour lay over in a few weeks. What are some solitaire card games or doodle games I could play? I enjoy playing freecell on the computer, but I don't really know the rules regarding how many cards you can move when x amount of cards are in the free cells. Could someone please explain that to me? I already have a few ideas for doodle games, but any solitaire/paper & pencil/doodle/dice ideas you have for solo games would be much appreciated.