Northwest Airlines is celebrating the opening of its WorldGateway facility in Detroit by offering members 2,002 WorldPerks bonus miles on all roundtrip flights between Feb. 24 and March 31 that include stops in Detroit. Beginning immediately, WorldPerks members who book roundtrip tickets to, through or from Detroit will have the additional mileage credited to their accounts.

The offer is valid for WorldPerks members residing in the 50 United States, Canada and Mexico. Members must register for this promotion prior to travel and no later than March 31. To register, go to http://www.nwa.com/offers/NWG2002.