FAA Ground Stop: Understanding the Impact of Air Traffic Control Outages

On November 13, 2026, a widespread air traffic control communications outage led the Federal Aviation Administration (FAA) to issue a nationwide ground stop. This significant event halted departures across the United States, causing thousands of flight cancellations and delays. The disruption highlighted the critical role of reliable communication systems in air travel and the cascading effects when these systems fail. Understanding the causes, impacts, and responses to such an event is essential for travelers and the aviation industry alike.

The Communications Outage and Its Immediate Effects

The FAA ground stop began at 3:53 p.m. Eastern Time on November 13, 2026. The agency cited safety and extraordinary circumstances due to a disruption affecting air traffic control communications. While aircraft already in the air were permitted to land, all departing flights were halted. Inbound international flights were evaluated and handled on a case-by-case basis.

By 6:20 p.m. that evening, FlightAware reported over 2,000 flight cancellations and more than 10,000 delays nationwide. Passengers experienced significant disruptions, with some aircraft returning to gates after taxiing and travelers being asked to leave planes. The impact extended to some Canadian airports, which also reported suspensions of flights bound for the United States.

Identifying the Cause: L3Harris Technologies and Network Issues

Reports indicated that a telecommunications network managed by L3Harris Technologies was at the center of the outage. This network is reportedly used for controller-pilot radio communications. While neither the FAA nor L3Harris initially confirmed the company’s specific role, individuals briefed on the matter described the network’s function. The investigation into the underlying cause was ongoing, with officials examining what happened. Homeland Security Secretary Markwayne Mullin stated there was no indication of a nefarious attack. It remained unclear if the disruption affected radar feeds crucial for maintaining separation between aircraft.

FAA’s Response and Resumption of Operations

The FAA technicians immediately began investigating the issue affecting all Air Route Traffic Control Centers. The agency communicated that departures would resume once facilities recovered and operations could be coordinated. Transportation Secretary Sean Duffy confirmed that FAA technicians were working to resolve the problem.

Shortly after 6 p.m., the FAA announced that departures would begin to resume through coordination with its air traffic control system command center. This phased approach allowed air traffic to gradually return to normal operations as the affected systems came back online. The agency had not provided a specific timeline for a complete restart of all flights.

Airline Adjustments and Passenger Options

In response to the widespread disruptions, major airlines offered options for affected passengers. United and Delta provided waivers for flight changes. Delta allowed customers to make free changes to their travel plans for flights scheduled on Friday and Saturday. United waived change fees and fare differences for qualifying flights departing through November 20, 2026. These waivers typically required the replacement flight to be in the same cabin and between the same cities as the original booking. Passengers affected by cancellations were also reminded of their rights regarding refunds or rebooking, as mandated by the Department of Transportation.

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