Originally Posted by Boyce Adams

Has anyone successfully used GCU on Korean Air? See below thread, I spoke with agent this morning asking what type of inventory was required and she said "it was a mystery." That was from the Diamond desk. I got my ATL-ICN upgraded but are there really different rules from other KE flights???
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thank you for your Million Miler and Diamond status. Please give me a few moments to review. *HKS

1h 1 hour ago
thanks it was my intention on booking the higher fare class to only use 2 GCU for whole trip with KE segments being upgraded at one time, ATL-ICN-HKT / BKK-ICN-ATL. I ensured there was Z available before I booked flights


Delta
Thank you for your patience, It looks like your upgrades have been cleared for your outbound ATL-ICN and your return ICN-ATL flight on Korean Airlines. *HKS

49m 49 minutes ago
yes but what about the upgrade from ICN-HKT? that should have been on the same certificate with ATL-ICN if upgrade space is available?


Delta
Thank you for your patience. For the codeshare flights operated by Korean Airlines ICN-HKT and returning from BKK-ICN; you would have to purchase your ticket in Y or B class to use a Z class upgra