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Incheon International Airport's check-in system malfunction, which began at 4:30 a.m. on Friday, was fully resolved by Friday afternoon, according to the airport operator. The disruption caused major delays in passenger processing, affecting passengers on 35 flights, and left travelers in long queues at departure halls. Ticketing services resumed for three airlines at Terminal 1 after the network was restored, and airlines restarted issuing tickets. Yonhap reports the system is back to normal and airlines have resumed ticketing.