Originally Posted by nako
Though your question is better suited for the CO forum, I believe that if you fly under your NW number, they'll treat you as an NW frequent flyer. In other words, they won't care about your CO status, meaning no elite bonus.
Mike
That's correct you wont get any miles bonus but if you show your CO elite card that might get you an upgrade or priority boarding. I do not know if this is the rule but this was my experience.