From July 1st 2010, Southwest Airlines will no longer be a partner of the Membership Rewards program. For those who have membership rewards points that need to be transferred to SouthWest have to do it by 30th June 2010.
Though this might represent a blow to cardholders of Amex, Southwest still has partnership with Chase. In fact, cardholder of the Chase Sapphire Card (which has no annual fee), could exchange their points for Southwest gift certificates. And because booking your travel with Chase earns you double points, the Chase Sapphire is like an airline credit card but without the annual fee!
Hence, if you want to earn Southwest rewards without having the Southwest credit card, then the Chase Sapphire will now be the card of choice.