The Federal Aviation Administration (FAA) issued a nationwide ground stop for all U.S. airports on a Friday afternoon following a telecommunications outage. Transportation Secretary Sean Duffy stated that the "communication issue" impacted all Air Route Traffic Control Centers and is currently under investigation. While international flights are being handled on a case-by-case basis, all domestic flights were halted.
The FAA last issued a ground stop of this magnitude in 2023 due to an outage in the Notice to Air Missions (NOTAM) system, which provides pilots with real-time hazard alerts. That previous incident was attributed to contract workers accidentally deleting files. Regarding the current outage, Homeland Security Secretary Markwayne Mullin stated there is no indication that the disruption was caused by a threat or attack against the United States.
By 6:00 p.m. EST on Friday, the flight tracking site FlightAware reported more than 10,000 flight delays and 2,500 cancellations across the country. These figures followed approximately 7,000 delays reported on Thursday. Secretary Mullin noted that two unspecified regions within the U.S. maintained communication capabilities and that aviation systems in other countries appeared unaffected.
Air Space Intelligence (ASI), a company providing an AI-enhanced software tool called the SMART system to the FAA, issued a statement clarifying that the ground stop was not related to its products or integration with air traffic control. The FAA confirmed the halt was a "temporary telecommunications outage" and stated the measure was taken out of an abundance of caution.
The scale of the disruption extends to the broader aviation market and logistical networks. With over 10,000 delays in a single day following 7,000 the day prior, the backlog creates a knock-on effect for airline scheduling and crew availability that can take days to resolve. The event also draws attention to the reliability of the FAA’s Air Route Traffic Control Centers, the regional hubs responsible for directing aircraft at high altitudes. While the FAA is currently integrating new AI tools to modernize airspace management, this outage involves the core telecommunications infrastructure used by these centers to maintain safety and separation between aircraft.
What happens next depends on the FAA's investigation into the root cause of the telecommunications failure. Unlike the 2023 NOTAM outage, which was linked to file deletion, the specific technical cause of this event has not yet been identified. Aviation regulators have not provided a specific time for when full service will be restored, though international flights continue to be evaluated individually. Travelers are currently advised to check flight statuses through airlines as the agency works to resolve the communication issues.