King County International Airport, commonly Boeing Field, is a public airport owned and operated by King County, 5 mi south of downtown Seattle, in the U.S. state of Washington. The airport is sometimes referred to as KCIA, but it is not the airport identifier. The airport has scheduled passenger service operated by Kenmore Air, a commuter air carrier, and was being served by JSX with regional jet flights. It is also a hub for UPS Airlines.