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/15
Last day Club Carlson members can stay twice and earn a free night between April 15 and June 15. Registration required at http://www.clubcarlson.com/freenight

/22
Last day JetBlue TrueBlue members can earn up to 25,000 bonus points on flights between Boston (BOS) and Washington Dulles (IAD), Reagan (DCA) or Baltimore (BWI): 5,000 bonus points for three roundtrip flights (six segments), 10,000 bonus points for five roundtrip flights (10 segments) and 25,000 bonus points for eight roundtrip flights (16 segments). Register at http://insideflyerus.wpengine.com/link/?4408

/30
Last day Hilton HHonors members can earn 1,000 points per night. Registration at http://insideflyerus.wpengine.com/link/?4367 is required.

Last day Virgin Atlantic Flying Club members can earn triple miles for stays at all Hilton Worldwide hotels. Registration required at http://insideflyerus.wpengine.com/link/?4403

Last day SPG members can register to earn a free resort night for every three stays at Starwood Hotels & Resorts through July 31, 2011. Register at http://www.spg.com/getawayfree

Last day Hyatt Gold Passport members can earn 10,000 bonus points after five nights. Plus, earn 5,000 bonus points for every two additional nights after that. Register at http://insideflyerus.wpengine.com/link/?4531