San Diego International Airport (IATA: SAN, ICAO: KSAN, FAA LID: SAN), also known as Lindbergh Field, is an international airport 3 mi (4.8 km) northwest of downtown San Diego, California, United States. It is operated by the San Diego County Regional Airport Authority. In 2015, traffic at San Diego International exceeded 20 million passengers. The airport had about 465 scheduled operations carrying 48,000 passengers each day, a total of 18,756,997 passengers in 2014. The airport has domestic flights and also has international flights to Canada, the United Kingdom, Mexico, and Japan. San Diego is the largest metropolitan area in the United States that is not an airline hub or secondary hub; however, San Diego is a focus city for Alaska Airlines and Southwest Airlines. The top five carriers in San Diego during 2015, by seat capacity, are Southwest Airlines (42.7%), American Airlines (14.0%), United Airlines (11.2%), Alaska Airlines (10.1%), and Delta Air Lines (9.9%).