I was wondering if I book the following flight on NWA.com:

YVR to SEA (Horizon Air)
SEA to MSP (Northwest Airlines)
MSP to DLH (Northwest Airlines)

And the return flights..

Even though I book it through Northwest, would I qualify for the 2000 bonus miles for passing through Seattle, in addition to the 2000 miles I would get for the 2-4-6-8 bonus, for doing two segments on Horizon and two segments on Northwest, or would all segments be considered "Northwest" segments?

Thanks.