Tips for flying on planes with 4 kids all under 4.?

I hope that they sleep for most of the flight. DVD players are great, but the battery generally lasts about 3-4 hours max. If you're lucky, you'll have in-seat entertainment systems. Get everyone their own seat. Don't even try to lap a child for this length of a flight. Bring twice as many diapers as you think you'll need, extra clothes for everyone (because its inevitable that someone will either throw up or spill on something). Bring extra sippy cups and empty bottles for the baby. If you use power formula, pre-measure out servings so that you can pour it into the waiting bottle or liner. Bring lots of wipes. Have each child have their own special blanket for the flight. Bring small bags of snacks, sandwiches, and other non-liquid foods for the kids to eat on the plane. If they have a favorite that you normally don't let them eat, the plane is a fantastic place to break out the bribe foods.