I believe you would have to pay for every flight for your parents. It is a huge hassle. Maybe just list for the one, and have the gate agents keep rolling them over to the next flights, etc...so you dont have to list for and pay for all those flights. Also I just give my parents my travel net username and password and let them learn and pay for themselves...that seems to be the easiest way to handle things. If they have to cancel and re-list after they have alreay paid, theirs or yours credit card will be refunded fairly quickly. Good luck.