Fly, fly away

Next week we'll be headed south for the piggroom festivities. The last time we flew with both kids it was, how shall I say this nicely, disastrous. I know there are folks out there who fly frequently with small children, so please, take pity on me and tell me your travel secrets. Here are the facts, so far:

1. We will be traveling on the busiest travel day of the year. Because I totally messed up the ticket ordering.
2. Our flight is at 3pm, give or take.
3. Currently one parent is sitting with both children (guess which one) and the other is a few aisles up the plane.
4. The flight is supposed to take three hours, give or take.
5. There is no food being served on the flight. One child is already hysterical about the fact that there will be no cute little turkey sandwich on a cute little tray (which neither child would ever eat anyway).

Thoughts? Tips? Tricks? Any ideas on good packable travel games/activities that a three-year old and a five-year old might both enjoy without fighting over?