I just received an email from Southwest about their Double Credit Days promotion, where you earn an extra Rapid Rewards credit for each flight. The promotion is running from April 7th through May 26th, 2010 and for each flight, you earn an extra credit. Business Select Fares during that time will earn 2.25 credits for “shorthaul” and 3.0 for “longhaul” flights.
Step 1: Register for this promotion between April 7 and May 26, 2010.
Step 2: Book a flight for at southwest.com or swabiz.com between April 7 and May 26, 2010.
Step 3: Complete your travel between April 7 and May 26, 2010.
Register through this link or on the Southwest.com homepage.