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A check-in system malfunction at Incheon International Airport on Friday (Oct. 30) caused major delays in passenger processing, starting around 4:30 a.m. in an airline network connection, according to the airport operator and Yonhap. The disruption, linked to instability in the U.S. ARINC network used for ticketing, affected check-in for multiple airlines—8 in Terminal 1 and 5 in Terminal 2—with three Chinese carriers suspending ticketing and resorting to manual check-in, while Korean Air also saw long queues. Passengers faced chaos in departure halls, with one traveler complaining, "My transfer schedule got messed up."