As reported by the Detroit News, Delta and Northwest Airlines have started the process of linking together airline mile accounts. After the merger between the airlines back in Oct 2008 there where many questions that arose about what the airlines were going to do with all of the miles earned by their frequent fliers. What is going to happen is they are going to honor everything you have earned. Before the merger the airlines had similar airline mile programs but where not exactly alike.
If you currently have a Northwest Airmile Credit Card you will want to link your account over to a Delta SkyMiles account before March 15th to receive a one time 500 point bonus. For those who do not do it before March 15th, Delta will do it for you without the bonus.
The Delta SkyMiles program is going to be the one that survives this transition as the NWA World Perks Credit Card program will be scrapped. To start making the transition yourself you will want to log into your respective online account and start transferring your airline miles over. Go to www.nwa.com/worldperks for NWA and www.delta.com/skymiles for Delta. After both companies have successfully merged accounts together, those who have a NWA airline mile credit card should receive a Delta credit card in the mail.