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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 reports from Yonhap, Korea Times, and KBS World. The disruption affected multiple airlines, with some reports noting three Chinese carriers and others citing network instability from U.S.-based ARINC, leading to long queues and stranded passengers at departure halls. Korean media, including Chosun Ilbo, Dong-a Ilbo, and Kyunghyang Shinmun, reported significant chaos and inconvenience, especially on a busy Friday, with passengers waiting anxiously as check-in and ticketing processes were delayed.