I have to ask... how could they not be used to their carseats? There is no other option in the car. It's not like they're going cold-turkey into a carseat on the plane and they're not used to riding in one every single time they get into a car.

The first time I took my preschooler on the train without a carseat, she informed me that she was not safe if she was not in her carseat (hey, whaddya know, she WAS listening to me all those times I said it).

Cali