Slowly and slowly NW is creeping up to Continental's level.

Continental doesn't issue any MCO/ECV's for fare drops. Rather, they charge you the change fee for the ticket and then re-price the itinerary. So for most tickets, if the change results in less than $100, there's no point in re-pricing the itinerary (assuming a $100 change fee). Yes, some change fees on CO are $35 while others are $200, but you get the point.

NW will be there within 2 years, I'd almost guarantee it.

-RM