Double Hilton HHonors Miles With Select Airlines

Register for this offer and earn double frequent flier loyalty program miles with Club Premier Aeromexico, American Airlines AAdvantage, Avianca TACA, Multiplus or United Airlines MileagePlus — including Copa Airlines — when you book and complete a stay by December 31, 2012 at select participating Hilton HHonors hotels and resorts within the Hilton Worldwide portfolio. You must first select a participating airline as your preferred Double Dip earnings style — select either Points and Variable Miles or Points and Fixed Miles — in your Hilton HHonors profile to qualify for this offer.
The good news is that there is no cap on the rewards to be awarded during the promotion period. However, the list of participating hotel properties is rather limited.