I believe any NW MAN-DTW service will now by 2009 at the earliest; having said that the 3 new transatlantic routes they announced a week or so ago only involved 2 with NW's own metal flying.
Until CX's fixation with LHR and the BA shuttle is ended, we have no prospect for them (and if they do start, it *has* to be a non-stop service so that it "competes" favourably with thier own LHR services, and not taking a lot longer to fly).
Noticed the 1st AY advert for the "3 times daily" Helsinki in the Manchester Evening News tonight.