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A check-in system malfunction at Incheon International Airport on Friday caused major delays in passenger processing, beginning at 4:30 a.m. in an airline network connection, according to Yonhap and Korea Times. The disruption affected passengers on 35 flights, with about 1,200 people inconvenienced at one point, and led to ticketing suspensions and flight delays for some airlines, Dong-A Ilbo reports. The airport operator said the system was fully restored by Friday afternoon, roughly 13 hours after the malfunction began, and ticketing services resumed for three airlines at Terminal 1, Yonhap and KBS World report. The cause was intermittent communication failures in the U.S.-based ARINC airline network, according to Dong-A Ilbo.