DL could have had it REAL easily if they would have stuck with the original plan to use NW's IT systems. But, no, DL has reversed course (I think many on here call it 'fleecing') and will use their own IT systems.
NW already provides this to the user. It will take DL years to do it, IMO, because they have far bigger IT issues to worry about right now. Like, umm, how to integrate two very different reservations systems.
-RM