FlyerTalk Forums - View Single Post - Upgrade preserved during SDC?
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Old May 29, 2022 | 7:32 am
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MSPeconomist
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Originally Posted by Pianoman109876
you technically didn’t “upgrade”- you paid a fare difference and had the ticket reissued (hence the revenue fare-class of “C”, not “OU”). COMPLIMENTARY upgrades ARE lost.
Also, AFAIK so are the upgrades where you pay to upgrade your seat on a segment. Those are supposedly nonrefundable too, although DL agents have been known to make exceptions.

OP is lucky that the purchased upgrade was the sort that involved upfaring to a FC ticket (which also allowed an easy SDC into any open FC seat with no fare class availability requirement).
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