Our kids are 5 and 3. We will be going to WDW in May. Flying US Airways on the way there and American Airlines on the way home. Do the airlines require the kids to still be in their carseats? I know once we hit the ground we will no longer need them until we get back on the plane. It would be extremely helpful if we didn't have to take their carseats on the plane. Also just wondering on the safety of that.