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Old Aug 11, 2015 | 10:33 am
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MSPeconomist
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I think some programs do use a sliding window, although AFAIK all of the USA based legacy carriers base their programs on the calendar year.

IIRC A3 did do the sliding window in going from *A Silver (=Blue) to *A Gold (=Gold on Aegean), but now it seems to be twelve months with a mid-late Novemeber closing date for everyone who participated previously.
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