Join Date: Nov 2000
Location: Nashville -Past DL Plat, FO, WN-CP, various hotel programs
Programs: DL-MM, AA, SW w/companion,HiltonDiamond, Hyatt PLat, IHF Plat, Miles and Points Seeker
Posts: 11,405
You can use DL miles for a NW ticket,and you would call DL directly to book that trip. I have done it and it works just fine.
With one exception. Northwest does not have the same visibility to seat charts for its customers that DL does. Less technology savy.