This means that your child will never have been belted in to anything. Therefore, the car seat can cause a great deal of distress upon the return home.
In our own case, my son freaked out! Even though I was sitting right next to him and our 5 1/2 year old was also in a car seat, he screamed for the entire 40 minute ride home from the airport. It took him months before there was not a melt down every time we went to the car.