I want to use a e-rewards PK for a NW flight. I can get one within a day but am not sure if it's good for an itinerary that has QX-operated BLI-SEA-BLI sectors. Could someone test an e-rewards PK for this itinerary (BLI-BOS) and tell me if NWA.com will take the PK?

I don't want to cash in my e-rewards money for a PK that expires if unused in a little over a week.

TIA