Has anyone taken Magical Express with young children who'd normally be in a car seat? We initially were planning on buying a new vehicle and driving, but we got such a good deal on air that we've decided to fly. I'm having our travel agent update our reservation for Magical Express, but DH is now thinking we might want to rent a car so that the girls ride in their car seats (since I've read car seats are not permitted on Magical Express). Anybody have any thoughts on this???