How are the North and South shuttle bus lines separated at the SeaTac Rental Car Facility, and which terminal should I board for my airline's baggage claim?

At Seattle-Tacoma International Airport (SEA), the Rental Car Facility (RCF) is located at 3140 S 160th Street, approximately 1. 5 miles from the main terminal. To ensure efficient passenger flow, the facility operates two distinct shuttle bus lines—North and South—that correspond directly to the terminal's physical layout and airline baggage claim zones. The North Shuttle serves the North Terminal, which houses Alaska Airlines (the dominant carrier at SEA, handling over 50% of domestic traffic) along with other domestic airlines such as American Airlines, United Airlines, and Southwest Airlines. Passengers arriving on these airlines should board the North Shuttle to reach baggage claim areas N1 through N11. Conversely, the South Shuttle serves the South Terminal, which accommodates all international airlines (including British Airways, Emirates, and Korean Air) as well as Delta Air Lines, which operates a major hub at SEA. These passengers should board the South Shuttle to access baggage claim zones S1 through S15. The shuttle buses run every 5 to 7 minutes during peak hours (5:00 AM–11:00 PM) and every 10 to 15 minutes during off-peak times. Each bus is clearly marked with large overhead signs reading “North Terminal” or “South Terminal,” and digital displays inside the RCF show real-time departure information. Misboarding can result in a 10- to 15-minute delay, as the two loops are physically separated and do not interconnect. For example, if you are flying Alaska Airlines and mistakenly board the South Shuttle, you will arrive at the South Terminal and must either walk approximately 0. 3 miles through the terminal connector or wait for the next North Shuttle to return. To avoid confusion, always check your airline's baggage claim number on your boarding pass or the airport's flight information displays before boarding. The RCF also provides a free inter-terminal train (the SEA Underground) that connects the North and South terminals, but the shuttle buses remain the most direct route from the rental car facility.