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I am looking to make a rather crazy booking, WUH-ICN-ATL-EZE where WUH-ICN is operated by KE and ICN-ATL and ATL-EZE are operated by DL. However the only problem is that only KE sells this ticket, not DL. If I buy the ticket through KE, does anyone know whether I can call in to DL to apply the GUC to the DL legs?
DL does not have fare filings on WUH-EZE, so no way to book fares through them. You can't apply GUCs on KE coded flights. Even if you could, you can't go directly from Main to D1 on Delta metal.