Join Date: May 2004
Location: formerly Gold now Diamond, formerly MSY, now LAX, formerly NW, now DL
Programs: Hyatt Plat, Hilton Gold, SPG Gold, Delta Diamond/1MM
Posts: 4,735
Just give Delta your NW FF number. Make sure that when you get your boarding pass, the NW number is on there. Sometimes you have to make sure the Delta number isn't there....
If you have already flown, then you have to send in your BP and receipt to NW for credit.