You already know about the 5,000 miles you can earn from Northwest the first time you book online and the 2,500 miles for subsequent online bookings. But did you know you can earn another 250 WorldPerks bonus miles if you are a Sprint customer in good standing and you book a flight through www.nwa.com?
The additional 250 bonus miles can be earned for all online bookings through Dec. 31. WorldPerks members must register online at http://www.nwa.com/offers/sprint250 no later than Nov. 30. All travel must be completed by Dec. 31 and a 250-mile bonus will be awarded for each reservation confirmation number. The offer may be combined with other online booking bonuses.