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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, the airport operator said, after causing major delays in passenger processing. Ticketing services resumed for three airlines at Terminal 1, and passengers on 35 flights were inconvenienced by the disruption, according to KBS World and Yonhap reports. The airport operator confirmed the network system has returned to normal and airlines have restarted issuing tickets.