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A network disruption in airline check-in systems at Incheon International Airport is causing major boarding delays on Friday, October 30, 2026, leaving passengers stranded in long queues at departure halls. According to the Incheon International Airport Corporation, errors were reported from some airlines starting around 4:30 a.m., with the failure attributed to network instability in the U.S.-based ARINC system used for ticketing. Yonhap reports that check-in procedures have been significantly disrupted, and Dong-A Ilbo notes that three airlines in Terminal 1 have suspended ticketing, worsening inconvenience for travelers on a busy Friday. Korean media outlets, including Kyunghyang Shinmun and Maeil Business Newspaper, describe departure halls as paralyzed and chaotic, with passengers anxiously waiting as boarding procedures face delays.