Oakland International Airport (IATA: OAK) is five miles south of downtown Oakland, in Alameda County, California. It is owned by the Port of Oakland. It is one of three international airports in the San Francisco Bay Area. The airport has passenger service to cities in the United States, Mexico and Europe. Cargo flights fly to cities in the United States, Canada and Japan. OAK is the closest airport to the San Francisco financial district—both geographically and by public transit.
Oakland is a focus city for Southwest Airlines and Allegiant Air. In July 2013 Southwest has 108 daily departures on peak-travel days of the week. Alaska Airlines combined with sister-carrier Horizon Air has been the second-busiest carrier at OAK through 2013. Beginning January 2014, Delta will overtake Alaska as OAK's No. 2 carrier.
The top five airlines by passenger count between February 2012 – January 2013 were Southwest Airlines (69.90%), Alaska Airlines (7.22%), JetBlue Airways (4.99%), Allegiant (3.11%), Skywest (2.77%). Between February 2012 and January 2013, 9,650,000 people traveled through OAK.
Passengers peaked in 2007 at 14.6 million and declined to 9.3 million in 2011. An advantage of OAK over SFO is OAK's history of a high on-time arrival percentage, despite many days of rainy and foggy weather in each city. In 2009 OAK had the highest on-time arrival percentage among the 40 busiest North American airports. Wikipedia