I am booked on a NW flight in mid-Feb. At the time I made the reservation, I was sure that I was leaving DL because of the announced evisceration of the medallion benefits. My NW FF# is loaded into the record. However, with many of the changes modified late in 2003, and with Song flights not being credited to NW, I have decided to remain with DL at least through 2004. Has anyone tried switching their FF# from NW back to Delta?