Double miles with Delta Airlines SkyMiles Gold American Express credit card

We recently received a promotional mailer from American Express highlighting double miles on every purchase for the month of December with the Delta Airlines SkyMiles Gold American Express credit card. It's an offer for select existing cardholders, and one reason why the SkyMiles Gold credit card is one of the better airline-only mile cards. Remember, this offer is only for *existing* cardholders. However these offers become available from time to time when you hold the card and do a nice job of helping your earning power. You can learn more about the card at this link on MileCards.com.