Update: These offers for the Gold Delta SkyMiles® Credit Card from American Express and Gold Delta SkyMiles® Business Credit Card from American Express are expired. Learn more about the current offer here.
If you redeem at least 10,000 miles from your Delta SkyMiles account by September 30, you can earn double miles on all purchases using a Delta American Express credit card between July 1 and September 30. You even earn triple miles for all Delta purchases. Registration is required.
This is a slightly compelling case to use the Delta American Express, though even so you’re not much further ahead than you’d be using a Starwood American Express card, for example. And that’s especially true for those that try to use their miles for international first class travel, since there are no such redemption opportunities using Delta miles anymore.
(Tip of the hat to MilesQuest)