Southwest Airlines Rapid Rewards members can earn double credits on all flights flown through May 26, 2010.Instead of one credit for each one-way flight, Rapid Rewards members will earn two credits. Fly roundtrip and you’ll earn four credits through May 26, which means that members will earn a free roundtrip award flight after completing four roundtrip flights.

Fly in Business Select and you’ll earn one bonus credit for each flight, which works out to 2.25 credits for flights less than 750 miles and 3.0 credits for flights 750 miles or longer. Registration is required prior to travel at http://insideflyerus.wpengine.com/link/?2402 and the offer is valid on new reservations only.