When DL switched from Frequent Flyer Program to Skymiles program they sent flyers and placed full page ads in several National (and I assume local) newspapers stating that OLD FREQUENT FLYER mile would never expire AS LONG AS DELTA HAS A FREQUENT FLYER PROGRAM and that, as long as flyer remained a Medallion Member, the Old Miles would be redeemed at the old Frequent Flyer rate.

Last year, when Frequent Flyer Miles were folded into, and mixed with, Skymiles, that all ended.

The old redemption schedule is gone and miles expire if no activity.

Randy Petersen has all documentation and, in fact, did an Inside Flyer article complaining about this action by DL.

Question, by sending mailers and placing ad stating that the miles would never expire and that they are redeemable at old rates, did DL make a legal contract with Members of the Frequent Flyer Program? And, is there any action that can be taken to reverse this move?