<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by nrr:
If I fly L, U or T class on DL and have the miles credited to my DL Skymiles account I only get x0.5 toward "medallion=elite" status. But if I take the same flight I will get full "elite" miles on NW. So if I find a cheaper fare on DL than on NW(for the same route), I will fly on DL and count the miles for NW. How does NW make money on this deal? They derive no revenue from my flying DL.</font>
Puting miles into World Perks for a Delta flight will be useful to you only if at some point you start flying NW. And once you see it is easier for you to get Eliete status on NW than on Deltas, you will switch.