US flight disruptions: Nationwide ground stop ordered for only the second time since 9/11

The United States experienced its second nationwide aviation disruption since the September 11, 2001, terror attacks when the Federal Aviation Administration (FAA) halted departures across the country for over four hours due to communications failures affecting multiple air traffic control centers. Although the FAA lifted the ground stop at 8:15 p.m. ET, widespread travel disruption continued, with more than 10,000 flights delayed or cancelled and airlines warning that cancellations could stretch into the weekend.

Homeland Security Secretary Markwayne Mullin stated there was no indication that the incident posed a threat to the United States, ruling out an apparent cyberattack and describing the disruption as "mechanically driven."

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