I'd say that if you are wanting DTW, then bid the 717 (if any openings anywhere), then the 320, and lastly the 73N.

I've got almost 400 below me and I would be 1 from the bottom in DTW73N. They sent a lot of recalls to DTW73NB, so who knows, maybe they will bid off? For right now though, DTW73NB is fairly senior.