Since you're flying with your child, you'll need your carseat for the airplane so there will be no need to rent one. If you're not planning on getting your baby a seat, I'd suggest you did, it's MUCH safer and more comfortable to fly with an infant in their car seat than holding them on your lap. If you choose not to, still bring your own car seat. I'm always afraid how safe they are, and where they've been. I'm sure they're not cleaned that well, if at all, between uses.