Hilton HHonors is offering 1000 bonus United Airlines Mileage Plus miles per two nights stay at all Hilton properties between October 1st and December 11th. You can earn up to 5000 bonus Mileage Plus miles.
You need to register for this promo and have United Airlines Mileage Plus either you variable or fixed airline partner. Bonus miles will be posted to your account shortly after the stay, based on my personal experience with Hilton, although the Terms and conditions of this offer say that it can take up to 6 weeks.
You can register for this offer at: https://www.hiltonhhonors.com/processLanding6.aspx?lp=unitedairlines
Terms & Conditions
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