I have a NW PD 727 which clearly states that Im entitled to $35 off any published fare of 200+ on NW, KLM or CO. When Ive called CO to book they tell me that I have to book it through NW, who then tells me that since the flight I want to book (EWR-DEN) is all on CO metal, I have to book through CO....UGH. Does anyone know how to work this out?