Northwest bonus miles. New WorldPerks members, who enroll online using source code VP2P, will earn 4,000 bonus miles for their first qualifying roundtrip. (Enroll prior to travel but not later than Dec. 31, 2002, and travel must be completed by Feb. 13, 2003.)
Existing members earn 1,000 bonus miles by registering online with registration number 5075 by Dec. 31 and complete travel by Feb. 13.
Either way, register here.