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Last day United Mileage Plus members can claim a trip in coach for 40,000 miles (normally 55,000 miles) between the U.S. 48, Alaska or Canada and Amsterdam, Brussels, Frankfurt, Geneva, London, Moscow, Munich, Paris, Rome or Zurich.

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Last day members of Choice Privileges can earn triple airline partner frequent flyer miles for qualifying stays at any Cambria Suites hotel.

Last day Delta SkyMiles members who sign up for Choice Privileges can receive Choice Privileges Gold Status plus 500 bonus SkyMiles with their first stay.

Last day JetBlue TrueBlue members can earn a free roundtrip travel certificate for completing two roundtrip flights between Boston and select cities, including Denver, Las Vegas, Oakland and San Diego.

Last day to stay two qualifying nights at a Best Western, and then stay at least one night between June 1 and Aug. 31, 2009, to earn 12,000 bonus Best Western Rewards points–enough for a free night’s stay.

Last day to earn triple American AAdvantage miles on nonstop routes between Boston and Los Angeles, San Francisco or San Diego. Registration required.

Last day Delta SkyMiles members can earn double miles and get late check out for stays at Sofitel Hotels in China.