debbiebones,
Traveling from Detroit to Orlando, you're probably flying Northwest airlines??? If so, you can check-in online 24 hours before your flight, pick your seats, and print your boarding passes. I would HIGHLY suggest doing this . . . HUGE timesaver!! Also, when you do it, try to get the seats in the 1st row of the coach section (right behind 1st class). All Northwest airlines aircraft have a TON of space in the 1st row, so the kids can actually get out of their seats and sit on the floor (we put a blanket down so it's not dirty) and they can color, play with dolls, trucks, etc. It really helps a lot!!
If you're not traveling on Northwest, then I'm not sure about the aircraft configurations, but I assume it's pretty close to the same, except you can't check in online and pick your own seats, so you have to request them at the airport. we3luvdisney had some great ideas. We do these as well. Buy them new things to do and don't let them see them until you're on the flight. It seems to keep their attention longer than their old stuff.