Blaine, They can use their NW WorldPerks numbers instead of DL. Just have them call DL and give them the number. One thing to note, if they have any status on NW, i.e. gold/platinum etc. they will not be able to use this for preferred seating/upgrades etc. somethign the airlines don't tell you! Mark Blaine Thompson wrote: > As I previously posted (thank you for those CVG ideas!), my parents will > soon be flying Delta and Delta Connection - TOL-CVG-LAS. Is it possible > for my parents to use their NW WorldPerks numbers for mileage credit, > instead of DL SkyMiles? Of note: > > 1. They belong to both programs. > 2. Their itinerary is coded with DL flight numbers. > > How does that all work? > > Blaine Thompson > Fort Wayne, Indiana > >