FAA halted all US departures for about four hours after an air traffic control communication fault

On Friday afternoon, US time, the country stopped flying. The Federal Aviation Administration (FAA) ordered an FAA ground stop for every airport in the country, wording its alert “due to extraordinary circumstances and for reasons of safety”.

It matters well beyond America. A nationwide ground stop is rare, and it shows how much of aviation depends on one thing working quietly: the links between controllers and the centres that guide planes in the sky. Many travellers, in many countries, are now waiting on a fix they cannot see.

The FAA ground stop so far: what is said, and the numbers

The FAA’s advisory said: “All departing traffic should remain ground stopped until further notice.” Inbound international flights, it added, “will be managed on a case by case basis.”

The agency told Fox News Digital that the cause was “communication issues impacting multiple Air Route Traffic Control Centers”. These are the regional centres that direct planes between airports. The FAA’s own site says 22 centres handle high-altitude traffic. Its technicians, the FAA said, are investigating.

At about 23:30 UTC (6:30 pm ET), the FAA said: “As enroute facilities recover, flights will be allowed to depart,” in coordination with its command centre. The stop was then lifted after about four hours, CNBC and Scripps News report, and by early 14 November the FAA’s own status page no longer listed it. CNBC says cancellations will stretch into the weekend.

Tracking sites give a sense of scale for the flight cancellations. FlightAware reported 1,913 cancelled and 10,494 delayed flights nationwide at 23:04 UTC (6:04 pm ET), and ABC News later put cancellations above 4,000. Flightradar24 said about 3,100 flights were headed to US airports right after the alert. Both are tracking-site figures, not official counts.

“Multiple” centres or “all” of them?

The first open question is scope. The FAA said “multiple” centres were affected. Transportation Secretary Sean Duffy wrote on X of “a communication issue impacting all Air Route Traffic Control Centers”. The two statements differ, and we report both as given.

The second is cause. Homeland Security Secretary Markwayne Mullin called it “a telecommunications outage” and said there was no indication of a “nefarious attack”. Fox News reports that the FAA said it was not a cyberattack. ABC7 reported that, during the stop, Mullin said there was no timeline for restarting flights.

One more detail. AirSpace Intel, a contractor behind the FAA’s AI congestion tool SMART, said on X that the ground stop “is not based on or a result of the SMART system.” The FAA had announced an expansion of SMART on 10 November. The company says the ground stop did not come from that system.

This is also the first nationwide ground stop since 11 January 2023, when the NOTAM safety-notice system failed. Before that you have to go back to the attacks of 11 September 2001. It also came a day after the global Microsoft 365 outage.

If your flight is among the US flights grounded

Check your airline’s app or website before you head to the airport. American Airlines says flights already in the air can continue to their destinations, but expects disruption “for the rest of the day, depending on the length of the FAA’s nationwide ground stop.”

Delta issued a waiver for no-cost changes on Friday and Saturday. United says it will waive change fees and fare differences if you reschedule. Rules differ by ticket, so read your airline’s notice. Keep your receipts for meals, hotels and transport. Now that departures have resumed, expect knock-on delays on Saturday, because planes and crews will be out of position. That last point is our analysis, not an official forecast.

A safety brake that did its job, and the question it leaves

On balance, stopping every departure is the cautious choice when controllers cannot reliably talk to the centres guiding planes. It is inconvenient and costly, and that is the point: aviation is built to pause rather than guess. The FAA and Secretary Duffy both promised updates, and departures restarted within hours.

The harder question comes later. One communication fault was enough to halt a whole country’s departures. Readers will want to know what failed, whether backups could have kept the system together, and what changes. Those answers are not here yet, and officials have not given them.

For now, the sensible plan is simple: stay flexible, trust your airline’s own notices, and watch the FAA’s National Airspace System status page for the next update.