As posted earlier, the airlines are trying to rev up spring travel with offering double miles on qualifying fares. Delta / Northwest announced their new promotion on Tuesday March 24th, just a few days after AA, UA, and CO announced their programs. Offering 3x miles could potentially help the newly merged airline bring in additional passengers who are in the process of merging their Delta and Northwest accounts.
The airline is still in the process of combining operations and sent out emails on Tuesday to their respective frequent-flier members to earn miles.
Delta SkyMiles(R) members can register their account here.
Northwest Worldperks members can follow the following link.