To be eligible for this offer, you must (1) select United Airlines as your preferred Double Dip® Points & Miles Partner in your Hilton HHonors™ account profile, (2) complete a minimum 2-night stay at a participating hotel or resort in the Hilton Worldwide portfolio from October 1, 2011 through December 11, 2011, and (3) register online at www.HHonors.com/MileagePlus prior to check-out. You must be a Hilton HHonors member to earn points and miles for hotel stays. Bonus United Mileage (Both Fixed & Variable Miles Members): Earn 1,000 bonus miles per qualifying stay of 2-nights or more, for a maximum of 5 stays or 5,000 miles. Allow up to six weeks after qualification, and after promotion has ended, for bonus miles to be credited to your account. Miles accrued, awards issued and bonus offers are subject to the rules of the United Mileage Plus program. Hilton HHonors membership, earning of Points & Miles™ and redemption of points are subject to HHonors Terms and Conditions.