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A check-in system malfunction at Incheon International Airport on Friday caused major delays in passenger processing, affecting around 1,200 passengers, with some airlines' ticketing halted and flights delayed. The airport operator said the system was fully restored by Friday afternoon, about 13 hours after the malfunction began at 4:30 a.m., according to Yonhap and Korea Times reports. The issue was traced to intermittent communication failures in the U.S. airline network ARINC, which connects check-in counters and airlines.