Hey There
I happen to have a lot of experience traveling with children, Last year I took 4 children under 2 years old on vacation. We purchased each of them a seat and brought their car seats on so they were strapped in at all times. They know they need to be strapped in while in a car and on the airplane it seemed as they just understood that too. To transport the car seat there is an AWESOME system called gogokidz. You can purchase this at gogobabyz.com they are wheels that connect to your car seat easily, and the child can sit in their seat buckled and oyu can manuever them thruout the airport. THe wheels can stay on on the plane, and you can take them off for the car. We wrapped items for them to open so that took some time, new books, mini etch a sketches, and the BEST item of all was a big sticker book. You can get it at amazon http://www.amazon.com/Giant-Sticker-Activity-Learning-Pap... This cost about 10$ but it is the best item i have ever come across, I had a 6 hour delay and this was used for most of the time. It has all the animals, foods, cars, etc in it, My daughter has used it for over a year, and uses it at least three times a week. Lollipops keep them busy and are great for take off and landing for their ears.. Besides that definately snacks, you can wrap those also gives them something to do to unwrap, juice boxes are always a hit!!