King County International Airport, commonly Boeing Field, is a public airport owned and operated by King County, five miles south of downtown Seattle, 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. It is also used by other cargo airlines and general aviation aircraft. The airfield is named for founder of Boeing, William E. Boeing, and was constructed in 1928, serving as the city's primary airport until the opening of Seattle–Tacoma International Airport in 1944. The airport's property is mostly in Seattle just south of Georgetown, with its southern tip extending into Tukwila. The airport covers 634 acres (257 ha), averages more than 180,000 operations annually, and has approximately 380 based aircraft.

Kenmore Air Harbor, Inc., doing business as Kenmore Air, is an American airline with its headquarters on the grounds of Kenmore Air Harbor in Kenmore, Washington, United States, north of Seattle. It operates scheduled and charter seaplane and landplane service to destinations throughout western Washington and southwestern British Columbia, as well as seaplane "flightseeing" flights around Seattle. In addition to its corporate headquarters, seaplane maintenance facility and terminal in Kenmore, the airline has hub operations in Seattle for seaplanes at Lake Union Seaplane Base and for land-based airplanes at Boeing Field. It also operates a maintenance facility for its airplane fleet at Boeing Field.