The ground stop was issued in the afternoon due to a “telecommunications outage” that impacted all Air Route Traffic Control Centers (ARTCCs), which manage high-altitude aircraft. Transportation Secretary Sean Duffy described the situation as involving “extraordinary circumstances” that necessitated the safety measure. While the specific technical cause was not fully detailed by officials, CNN reported that the problem may have originated with network routers at Chicago’s Midway Airport.
During the hours-long shutdown, all departing aircraft were ordered to remain on the ground at airports across the country. The disruption affected more than 10,000 flights, causing significant chaos for travelers. At Los Angeles International Airport, authorities urged passengers to check with airlines for information on delays and cancellations. Among those grounded was the USC women’s basketball team, which was scheduled to travel to play against No. 1 South Carolina.
Mullin emphasized that there were no lives at risk and that the FAA handled the situation effectively. He noted that once the planes already in the air landed, it would take “some time” before normal operations could resume due to the accumulated backup. The FAA did not provide immediate details on the root cause of the outage, leading to public speculation about potential links to recent digital infrastructure issues or artificial intelligence systems, though no such connection has been verified by authorities.
This incident marks the first nationwide ground stop since the terrorist attacks of September 11, 2001. A similar, though less severe, nationwide grounding occurred in January 2023 following a failure in the Notice to Air Missions system. The event highlights ongoing concerns regarding the resiliency of critical aviation infrastructure, as the outage demonstrated how a single point of failure in telecommunications can have national consequences.
The ground stop has now been lifted, and authorities are working to clear the backlog of delayed flights and restore normal schedule operations across the U.S. aviation system.
