Seattle–Tacoma International Airport (IATA: SEA, ICAO: KSEA, FAA LID: SEA). It is located in the city of SeaTac, approximately 13 miles (21 km) south of Downtown Seattle, state of Washington. The airport is the 28th busiest airport in the world by passenger traffic, serving over 45 million passengers in 2016, and is considered one of the fastest growing in the United States and the world. The airport has flights to cities throughout North America, Europe, the Middle East and Asia. It is the main hub for Alaska Airlines and its regional subsidiary Horizon Air, whose headquarters are near the airport. It is a hub and international gateway to Asia and Europe for Delta Air Lines.