Boeing Field, officially King County International Airport (IATA: BFI, ICAO: KBFI, FAA LID: BFI), 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 this is not the airport identifier. The airport has some passenger service, but is mostly used by general aviation and cargo. It is named after the founder of Boeing, William E.