To promote Southwest newest destinations, they are offering double points promo for 2 cities Memphis, TN and San Juan, Puerto Rico.
For Memphis destination, you must register and book flights from Sept 12, 2013 to Jan 31, 2014 for travel to/from Memphis from Nov 22, 2013 to Jan 31, 2014. Double points means that you will get 12 RR points/$ instead of 6/$ for wanna get away fares. Bonus points will not count towards companion pass or A list Status.
For San Juan destination, you must register and book flights from Sept 12, 2013 to Dec 31, 2013 for travel to/from San Juan in the same period. Double points means that you will get 12 RR points/$ instead of 6/$ for wanna get away fares. Bonus points will not count towards companion pass or A list Status.
Since these destination are now bookable on Southwest, you can use your Companion pass and Rapid Reward Points for free travel.