Please, please bring your car seat. On our last trip, we decided to bring our car seat because our 2 year old can never sit still and we were hoping he would settle down since he was used to his car seat. On the flight home, the turbulence was extremely severe. There's no way we could have held on to him. We were all scared to death and learned a very valuable lesson. Chances are, you won't hit life threatening turbulence, but the piece of mind is priceless. The carseat also did solve the problem of sitting still and it was nice to have for the car rental. It was also extremely easy to transport and hook up to the seat.