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A check-in system malfunction at Incheon International Airport on Friday caused major delays in passenger processing, starting at 4:30 a.m. in an airline network connection, according to the Korea Times and KBS World. Yonhap reports the disruption left passengers stranded in long queues at departure halls. The system was restored after 11 hours, with no delayed departures for Korean airlines, but Chinese airlines experienced delays, including three carriers that halted ticketing and switched to manual check-in, per Maeil Business Newspaper and Yonhap. Passengers complained that their transfer schedules were disrupted, with one saying, "My transfer schedule got messed up."