We are flying to WDW from California (LOOOONG FLIGHT!). I will have a *just* turned 4 year old with me (as well as a 5.5 year old). He is a bit of a defiant fellow (understatement!) but he's becoming increasingly aware of wanting to be like his big brother, and do things like he does. However, he tends to be very clingy, and gets scared of things often. When that happens, he wants to jump in my lap for a hug. I'm at a loss of what to do for the flight. He's flown before, but just once. He rode in his giant, heavy carseat, and did fine. But, that was only a one hour flight. He couldn't really play with toys or watch anything on the dvd player, because he wasn't able to put the tray down and use it (him + seat left no room for that). He was very happy to have his carseat, and did not want to sit on the seat next to me during snack time. This was about 9 months ago. So, what would you do? I am worried that he might refuse to sit on the seat, or to STAY nicely seated and buckled in when we need him to be. He is too big to sit in my lap for takeoff, and he can be very difficult in the throes of a tantrum. He has a speech/language delay, so has a hard time comprehending reasons for things (long explanations get lost on him) and expressing how he feels. But, he might do just fine. He rides the bus from school everyday and sits on the seat with lap belt only and does great (but it's only a 15 min drive). On the other hand, we will be on two long flights (3+ hours each), and I want him to be able to use the tray, play, watch dvd's, etc. without feeling confined and be able to move a bit more than when he is strapped down fully. What has been your experience with a 3-4 year old in JUST the seat, no carseat? We really want to minimize the stuff we have to carry through the airport, especially. It was VERY hard last time to deal with the two kids, carryons, and the giant heavy carseat. We are not renting a car, so no need for the seat upon arrival.