Sea-Tac Rental Car Facility supports all airport-related rental car operations at 1 convenient location, providing free shuttle service to and from Sea-Tac Airport. Dedicated shuttle buses operate 24 hours a day with two passenger pick-up areas located outside baggage claim at the north and south ends of the main terminal. When you arrive at Sea-Tac Airport: -Proceed to the baggage claim level and pick up your checked bags. -Exit the sliding glass doors near carousel #1 or #15 and walk to one of the two designated shuttle bus pick-up areas. -Shuttle buses depart frequently for the rental car facility. -If you are returning a vehicle, take SR518 and follow signs for the Rental Car -Facility.proceed to are used at peak periods with less than three minute waiting times.