Quick question on airport codes
 

When looking for cheap flights I've found it really useful to know that on alot of sites you can use one code for multiple airports. The ones that quickly come to mind are CHI, NYC, WAS, LON is there one for the bay area ?, or the 3 south Florida airports. Refer me to a link or thread if this has been addressed, it would be pretty helpful to know if there are others anyplace else in the world. Thanks, still kinda new here, but promise to be a "contributor". I'm now Caribbean based here, so can help on any island questions or connections.

Here's a recent thread on the subject:

http://www.flyertalk.com/forum/showthread.php?t=324976