Update: The limited time offer is expired.
For a limited time there are a few Delta American Express cards that are offering bonus miles for signing up and meeting minimum spending. If you are considering these offers; hurry, as the offers expire on September 8, 2014 so there is still time to sign up and get the increased bonus miles!
Limited Time Delta Offers
The 3 Delta card limited time offers are as follows:
These offers will not be around for long. I personally have the Platinum Delta SkyMiles® Credit Card from American Express because of the option to earn bonus MQMs after meeting the spending threshold.