Good news for San Francisco readers...
Today only, Southwest Airlines is offering discounted "Ding!" fares on flights out of of San Francisco International Airport (SFO).
The deal -- running from 9 AM to 9 PM today -- is in celebration of Southwest's one-year anniversary of its return to SFO. Southwest served the airport consistently from 1982 to 2001, but was off the roster at SFO until August 26, 2007, when it started running 18 daily flights out of the Bay Area.
"Ding!" fares are only available to Southwest customers who download the "Ding!" widget from the company's site (linked). The tool delivers special rates to users' desktops -- and is a very clever way for the airline to embed itself into a consumer's everyday life.