The Trump administration halted departing flights nationwide Friday after communications problems affected air traffic control centers across the country, imposing a rare nationwide ground stop without immediately providing a detailed explanation of the failure.
The Federal Aviation Administration cited “extraordinary circumstances and for reasons of safety” in ordering aircraft to remain on the ground until further notice. Transportation Secretary Sean Duffy said technicians were investigating a communications issue affecting all Air Route Traffic Control Centers, the regional facilities that guide aircraft between airports.
Three days before the nationwide ground stop, the FAA announced the expansion of SMART, its cloud-based traffic-planning platform, to airspace managed by all 22 centers. The system combines 200 data streams to support recommendations intended to reduce delays and fuel consumption.
No established evidence connects SMART to the communications failure. Its timing nevertheless supplies an unforgiving measure of the administration’s salesmanship: Tuesday brought the announcement of more sophisticated planning; Friday brought a nationwide order to stay put.
The restriction halted takeoffs rather than ordering every aircraft out of the sky. Planes already airborne could land, while international flights would be handled individually. Officials did not immediately provide a timetable for restoring departures or identify the underlying technical cause.
It was the third nationwide ground stop, following the shutdown after the Sept. 11, 2001, terrorist attacks and the January 2023 failure of a system that provides critical notices to pilots. The 2023 interruption suspended domestic departures for less than two hours.
Friday’s disruption came just three days after the FAA announced the nationwide expansion of a new traffic management platform intended to reduce delays, conserve fuel and improve air travel.
In its Nov. 10 announcement, the agency said the Strategic Management of Airspace, Routes and Trajectories system, known as SMART, would expand to airspace managed by all 22 centers after an initial rollout in the Washington region in September. The cloud-based platform combines 200 data streams, including weather, flight paths, traffic flows, and controller staffing information.
FAA specialists review the platform’s data and send scheduling recommendations to the Air Traffic Control System Command Center in Warrenton, Virginia. Those recommendations then go to local air traffic control facilities for consideration.
The FAA describes SMART as a planning tool that works alongside existing systems. Controllers retain responsibility for keeping aircraft safely separated. The available information did not establish a connection between SMART’s expansion and Friday’s communications failure.
The shutdown also came as the administration sought more money to overhaul the nation’s aging air traffic infrastructure. Congress approved $12.5 billion last year for modernization, including replacing copper wiring with fiber-optic connections and upgrading radio systems. Duffy has said roughly $30 billion more is needed to complete the work.
For travelers, the immediate instruction was to check directly with their airlines. Houston’s Bush Intercontinental and Hobby airports advised passengers to monitor flight status as departures remained on hold pending further FAA instructions.
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