We have done the booster in the suitcase before and yes it worked well but this time we hoping to reduce the number of suitcases we will have to bring because we have 5 sharing a rental car instead of the usual 3. We are hoping to find some kind of bag that we could use? I know Southwest will provide a bag for boosters and I wonder if AirTran will. This is the first time we are using Airtran.