San Diego International Airport (IATA: SAN , ICAO: KSAN , FAA LID: SAN ) is the primary international airport serving San Diego and its surrounding metropolitan area, close to the skyscrapers of Downtown San Diego. The airport is known as the busiest single-runway airport in the US, with a difficult landing due to the relatively short landing area, steep descent angle over the crest of the Bankers Hill. KSAN airport has two terminals and 51 gates: Terminal 1 The historic terminal currently has 14 gates in use Terminal 2 has two concourses (East and West), 32 gates