Dollar 2x credit if not CP
I got this, don't know if it's been posted:
As a Rapid Rewards Member, you can earn double Rapid Rewards credit on rentals of any car type for two consecutive days or more. For double credit, you will receive one credit instead of the standard 0.5 credit per rental. This offer is valid at participating worldwide locations from April 22 through June 30, 2010.
For reservations, book online at southwest.com. Enter WN42 in the Promotion Code field, and be sure to provide your Rapid Rewards account number at the time of reservation to receive your credits.
Book now, and get double credit on your next DOLLAR® rental!