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/15
Last day Delta SkyMiles and Singapore KrisFlyer members can earn or burn miles with either program. You can book award tickets through May 15, 2010 for travel on either airline until May 14, 2011.

Last day Delta SkyMiles members can earn flight miles that will qualify for Delta’s Together We Fly promotion to earn up to 20,000 bonus miles by teaming up with friends and family. Visit http://www.togetherweflydelta.com for more information.

Last day goldpoints plus members can stay three consecutive nights at participating Country Inns & Suites in the U.S. and Canada to receive the third night free plus 3,000 bonus points.

/21
Last day United Mileage Plus members can earn up to 5,000 bonus miles on roundtrip flights between the U.S. and Madrid. Registration required.

/30
Last day Best Western Rewards members can stay twice and earn a $50 travel card (expiring Nov. 1, 2010). Plus, members who book online at bestwestern.com earn 250 bonus points; pay with a Best Western Rewards MasterCard to receive an additional 1,000 points.

/31
Last day to register for Continental OnePass Mileathon at http://www.continental.com/mileathon and earn up to 100,000 bonus miles for completing credit-earning activities at continental.com from April 1 through June 30, 2010.