How do I choose the correct dedicated North or South terminal shuttle when boarding at the SeaTac Rental Car Facility to return to the airport?

After you return your rental vehicle at the consolidated SeaTac Rental Car Facility (3150 S. , SeaTac, WA 98188), walk to the ground-level shuttle staging area outside the customer-service counters. Two separate, clearly marked buses operate from this single boarding zone: the North Terminal shuttle and the South Terminal shuttle. These routes are not interchangeable—each bus is dedicated to one side of the main terminal and will drop you only at the matching baggage-claim loop on Floor 3 (Ground Transportation level). Board the North Terminal shuttle if you are flying Alaska Airlines, American Airlines, or any carrier operating from Concourse D or the North Satellite area. This bus travels the north loop and stops exclusively at Door 26, directly serving North Baggage Claim (Carousels 9 through 15). Escalators and elevators beside Door 26 take you up one floor to Floor 4 ticketing. Board the South Terminal shuttle if you are flying Delta, United, Southwest, international carriers, or any airline using Concourses A, B, or the South Satellite Terminal (S). This bus stops only at Door 00 on the south end, opening to South Baggage Claim (Carousels 1 through 8) and nearby international check-in counters. Complimentary shuttles run 24 hours a day, 365 days a year, and typically depart every 5 to 10 minutes. The ride to the terminal usually takes 5 to 8 minutes, depending on loop-road traffic. Boarding the wrong shuttle can add more than 20 minutes to your trip because you would need to walk the full terminal length or ride the underground train to reach your airline. Before boarding, confirm your departure concourse on the digital shuttle displays or ask a facility attendant.