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Currently, Southwest is running a promotion offering double points and double Tier Qualifying points on routes starting or ending in the following destinations: All California destinations (Oakland, San Francisco, Sacramento, San Jose, Burbank, Los Angeles, Ontario, Orange County, San Diego), Denver, and Atlanta
You must register for the promotion and in unfortunate Southwest fashion, must book your flight AFTER registration. If you have already booked your flight and the rate has not changed, you can cancel and re-book your flight for no fee. Both promotions run through March 31, 2012.