We're flying to CA at the end of June and buying a seat for each of the kids.

DS will sit in his convertible car seat. My parents have a convertible car seat for DD at their house (I bought one the last time we were there and shipped it to them), but I'm wondering if we should take DD's seat anyway for the flight and just use it while we're there.

The flight is 4-5 hours long and there's a good chance she'll nap if she's sitting in her car seat.

Thanks!