Good News - the Double Blue Chip Rewards promotion has been extended.
https://www.thrifty.com/Specials/BCAX.aspx
Just book and complete a rental between February 1 and May 31, 2008, and instead of earning one credit per rental day, you'll earn TWO when you pay with an American Express Card!
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BCAX - Earn Double Blue Chip Rewards
Valid February 1-April 30, 2008.
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PS Thanks for a great thread!