In a year or so I am thinking of flying with a 5 y.o., a 3.5 y.o. and a 1 y.o. How does it work with car seats? I know it's safer to have the 1 y.o. in a car seat but what about the others? Do people take 3 car seats and 3 kids on a plane? I am starting to think the trip isn't possible, or would only be possible if I were willing to cut corners on safety (I'm not). TIA for any thoughts on this.