Every once in a while I pop over to Rene's Points to catch up on his blog, and today I'm glad I did - he's got what appears to be the scoop on a serious issue for those us who are in the DM zone using DL branded AMEX cards.
Bottom line:
DL is planning on limiting the MQD spend waiver to Platinum and below. So you'll need to hit $15K on DL ticket spend for DM qualification, instead of qualifying via the $25K waiver.
http://renespoints.boardingarea.com/...edallion-year/
He's got contact info on the above for DL & AMEX along with good suggestions on how to make noise about this horrible devaluation.