People sometimes use major airport codes as shorthand for a city or the metropolitan region the airport serves.
The airport is actually a couple of cities away (there are a lot of cities in the Bay Area).
NYC - JFK LGA EGW
PARIS - CDG ORY
London - LGW LHR
Tokyo - NRT HND
SF - SFO SJC
If someone starts refering to a city by the airport code I'd be completely lost because most airports and their codes don't reflect the name of the city they service.