We are flying United to Buffalo on Sunday morning - departing 7:56 AM. I would like to drop my 96-year old father and our luggage at Departures and then return the rental car (AVIS). Is there a place where he can sit and wait for me to come back via the Sky Train to check in and proceed to security and the gate? Or would it be better to park in short-term/handicapped area, check in and check our bags then I return the car while he waits at the Check-in area? How much time should I allow to get to the Rental Car return and back to Terminal A?