A disruption to airline check-in systems at Incheon Airport caused major passenger-processing delays Friday, effectively halting normal ticketing operations at three Chinese carriers by the afternoon. The airport corporation said the disruption began around 4:30 a.m. and affected airline networks connected to ticketing systems. Sporadic communication outages continued to affect eight airlines at Terminal 1 and five at Terminal 2. By 2:19 p.m., regular ticketing operations had effectively stopped