The largest airport in the Pacific Northwest, Seattle-Tacoma International Airport (SEA) handled about 37.5 million passengers in 2014. The airport, which is located about 12 miles south of downtown Seattle, serves as a hub for Alaska Airlines, Delta Air Lines and Horizon Air. In total, more than 20 carriers fly to the airport, including American Airlines, British Airways, Emirates, JetBlue Airways, Southwest Airlines and United Airlines. Passengers can fly non-stop between SEA and points in North America, Europe, the Middle East and Asia. Also known as Sea-Tac Airport, it consists of three runways and a central terminal plus two satellite terminals. The Central Terminal has four concourses – A, B C and D – and 43 gates. The North Satellite Terminal has 12 gates, and the South Satellite Terminal has 13 gates. The airport's parking garage has the distinction of being North America's largest parking structure under one roof; it contains both short-term and long-term parking.