I received this one in 2015, but just used it (expires 1/31/16).
AMEX Everyday Preferred
ammericanexpress.com/delta2015
Statement credit of $250 when enrolled card is used for purchases totaling $1,000 or more with Delta.
I had some upcoming personal travel to book (SFO-NYC), this just saved me $250.
Different offer (same card) that was quickly reimbursed: Sur La Table - $10 off purchase of $100 or more.