:The second largest airport in the region and a hub for mostly low-cost domestic flights. Oakland International is the base airport for the rapidly growing Southwest Airlines.
:A minor airport in Santa Rosa, it is served by one commercial airline, Horizon Air.
Public transportation
Mass transit
The Bay Area is served by a number of mass transit systems:
Bay Area Rapid Transit (BART) - A subway/commuter rail service that serves parts of the Bay Area, including San Francisco, Oakland, Berkeley, Fremont, and Walnut Creek. It has a direct connection to San Francisco's airport while a direct connection to Oakland's airport is in the planning stages.
Caltrain - A commuter rail service that connects San Jose and cities along the Peninsula with San Francisco, and with the BART system by way of the Millbrae Station.