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Last day American AAdvantage members can earn two miles for every $1 donated to UNICEF (maximum 2,000 miles per member). Must donate through http://www.unicefusa.org/aa

Last day Aeroplan members can earn up to 1,500 bonus miles when staying at participating Hilton Worldwide hotels. Registration is required prior to your stay at http://insideflyerus.wpengine.com/link/?3319

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Last day Choice Privileges members can get up to 50 percent off the regular redemption rate for stays at Preferred Hotel Group properties.

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Last day AirTran Airways A+ Rewards members can earn one bonus credit for every roundtrip flight from Atlanta booked and travel started by this day. The bonus credits will also count toward elite status. Flight companions also get credits. Registration is required at http://insideflyerus.wpengine.com/link/?3577

Last day Starwood Preferred Guest members who stay three times between Nov. 1, 2010 and Jan. 31, 2011, and pay with a MasterCard, can earn a free night at properties in Asia Pacific, the Middle East and Africa. Registration is required at http://www.SPG.com/mastercardfreeweekend

Last day Delta SkyMiles members can earn double miles on select Delta, Air France, KLM and Alitalia nonstop transatlantic flights. Registration is required at http://www.delta.com/transatlanticdouble prior to flying.