We've flown with DD several times and have always gate checked the car seat. This time we are taking a lightweight umbrella stroller with us that doesn't fit the carseat. We would prefer to check the carseat at the ticket counter so we don't have to lug it around the airport. I'm thinking of putting it in a big duffle bag. Anyone else done this? I've seen carseats in those big plastic bags also. Do you get those at the airport and would that be a better alternative? It's a short flight so we don't mind holding dd or if there is an extra seat she could always just sit in it if we are close.