9/2/2014 only:
The United MileagePlus portal is offering 10 miles per dollar for shopping at Sephora, eBags, Nordstrom, and Macy’s.
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Would this still work with a gift card? I smell double dip potential…
Unfortunately, with these particular merchants, I don’t think you’ll earn miles when buying gift cards. See: https://frequentmiler.com/laboratory/
With the possible exception of Sephora (I’m not sure either way)