When returning your rental car to the airport, you should follow the signs to the Ground Transportation Building. Once you're in the garage, look for a spot that is for your rental car agency, i.e. Enterprise or Avis. ﻿Pull up in the parking spot and collect your belongings and paperwork. Finally, examine your car and head to the rental car desk. Hand your keys and paperwork to your agent or drop the keys in the box and head to the gate. Give yourself plenty of time so you're not rushing to catch your flight. Search car hire on KAYAK