If you send NW a copy of the receipt for your ticket, won't they give you the miles? You haven't really explained why you didn't get miles for your flight. (Did you ask NW? What was their explanation?) I have always received miles for my NW flights, even on consolidator tickets. NW is well known for giving full mileage credit on all paid tickets. Maybe the only reason you didn't get miles was some computer error. Sending them documentation (i.e. a receipt) of your trip ought to solve the problem.