Originally Posted by Silverman
San Francisco only has one airport. You could make the argument that OAK is a secondary airport serving the frater Oakland/SF region. SJC is in a different metro area so really would not be considered an airport for SF. SJC primarily serves the San Jose/Silicon Valley area as well as the Greater Santacruz and Monterey areas.
Actually, the official census metro area name is "San Jose - San Francisco - Oakland Metro Area" so SJC would count. SFO and OAK are close enough to be considered SF airports. SFO is actually outside city limits (about 15 miles out), although technically it's a piece of San Francisco outside the city limits. So, because SFO is some distance away, Oakland Airport is actually closer (if you take a straight-line distance). And we all know that all three serve the same customers, so yes, SF area has at least 3 commercial airports.