I just received the offer below from Delta. I’m assuming it’s targeted for NYC based flyers, but why not give registration a shot. You must register by March 23, 2013 and fly round trip on select routes by April 22, 2013 to earn a $50 AMEX Reward Card. Fly a second roundtrip and earn an additional $75 reward card. It should also be noted that several of these routes have roundtrip flights priced in the $129-$179 range (MIA, CLE, DEN) during the promo period, meaning the $50 card is equivalent to a 30-40% discount on your flight!