You can also earn double flown miles on your delta.com bookings when you purchase with any American Express® Card

As part of the SiteSeer Challenge, American Express Cardmembers can also earn double flown miles! Enroll between 7/25/07 and 9/19/07, and then use any American Express Card to purchase a ticket on delta.com. This offer is available for flights between 7/25/07-9/30/07. All travel must be completed on 9/30/07.

Not a Cardmember, Click here.