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The US Federal Aviation Administration lifted its nationwide ground stop on Friday after a communications failure at air traffic control centers, but the fallout continued into the weekend. The FAA's head predicted air travel would not return to normal until late Sunday, with thousands of flights affected. FlightAware data cited by Reuters showed 4,094 cancellations on Saturday morning alone, and over two days the total reached 13,265 flights, according to Chosun Ilbo. The Dong-a Ilbo reported about 6,000 flights canceled and 10,000 delayed. Officials are investigating whether aging equipment, possibly from replacing outdated air traffic control networks, caused the outage, with no signs of a cyberattack. The FAA said the system's aging could cause a repeat if not overhauled. Korean outlets like Chosun Ilbo and Dong-a Ilbo are covering the chaos, noting the FAA's ground stop was the first nationwide since January 2023, and the Kyunghyang Shinmun highlighted the aging network, including floppy disks and copper wires, as a factor.