FlyerTalk Forums - View Single Post - Can I pay with miles to upgrade to Comfort +?
Old Apr 18, 2016 | 7:34 pm
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MSPeconomist
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You could have at the time of ticketing if you have a DL AmEx card associated with your account and if all flights on the itinerary are DL operated and DL marketed IIRC. Ex post, no.
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