Weight and size restrictions apply here as they do with all other luggage, and airline rules can be quite lengthy and differ greatly from one carrier to the next. No matter what airline you choose, we recommend investing in a car seat travel bag to protect your seat from wear and tear. The bulky item that does not have wheels for easy transport is the car seat. what are the rules for bringing a car seat on a plane? Different airlines have different regulations and policies regarding bringing a car seat along for the flight, so knowing how your airline handles them can give you a leg up. Whether you use it on the plane or in the car once you arrive at your destination, flying with small children usually means that you are traveling with car seats.