Last quarter Delta and Hilton run a promotion for Medallion Qualifying miles. This time they have teamed up to offer 2012 bonus Delta SkyMiles per two night or longer Hilton stay. These points are addition to the variable miles or fixed miles that you can earn if you choose the double dip option.
This promotion is valid from January 2nd to March 31st, 2012. You need to register for this promotion before check out at www.HHonors.com/delta2012. The terms and conditions indicate that this offer is not combinable with other offers.