Thanks for the help folks! So on another thread someone recommended Lansky Transportation. Pricey but seemingly worth it? So I'm considering that too but we've now decided more or less to bring the car seat with us both for peace of mind and flexibility (heaven forbid we have an emergency and need to leave the hotel at any given time). We were just trying to avoid the extra weight but having read everyone's experience, better to stay on the safe side. With that settled, then it opens up many more transport options.