TL;DR
The FAA ordered a nationwide ground stop for all departing flights at 3:54 p.m. ET Friday, saying the move was made for safety amid extraordinary circumstances. Homeland Security Secretary Markwayne Mullin said a telecommunications outage was the explanation officials were pursuing, but investigators had not established the cause. Airborne flights continued, while delays and airport capacity problems grew.
The Federal Aviation Administration ordered a nationwide ground stop for all departing flights at 3:54 p.m. ET Friday, citing “extraordinary circumstances” and safety as officials investigated what Homeland Security Secretary Markwayne Mullin described as a telecommunications outage. The order disrupted U.S. air travel, with inbound international flights handled individually and aircraft already airborne continuing their journeys.
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The FAA’s alert instructed that all departing traffic remain grounded until further notice. It did not initially explain what had failed or say how long the restriction would last. The agency said inbound international flights would be managed case by case, rather than included in a blanket instruction to stop arriving aircraft.
When the alert was issued, 4,042 flights bound for U.S. destinations were airborne, according to Flightradar24, the flight-tracking service cited by NBC News. Mullin said passengers already in the air had no reason for concern and that officials had been assured everyone was safe. United Airlines said its airborne flights would continue, while new domestic departures would not leave during the FAA order.
The disruption quickly became a ground-management problem as well as a safety response. A source told NBC News that Reagan Washington National Airport was at capacity by 6 p.m. ET and Chicago O’Hare was nearing capacity, leaving limited room for aircraft unable to depart. The source said some planes might have to divert. An aviation logistics professor estimated that 3,000 to 4,000 flights could be held up over a period of more than two hours; this was an estimate, not an official FAA count.
How the Stop Disrupted U.S. Airports
A nationwide restriction on departures can affect travelers far beyond those waiting to board. When aircraft cannot leave, they occupy gates and ramp space needed by incoming planes, while arrivals can add pressure to airports with limited room. The reported capacity constraints at Reagan National and O’Hare raised the prospect of diversions, missed connections and longer delays as airlines and air traffic managers tried to keep aircraft moving safely.
The scale was substantial: aviation expert Vikrant Vaze told NBC News that U.S. domestic markets typically see about 25,000 flights a day. That figure describes normal daily activity, not the number canceled or delayed in this incident. The source report said an aviation expert estimated that 300,000 to 400,000 passengers could be stranded several hours after the stop began; that, too, was an estimate rather than a confirmed passenger count.
For passengers, the immediate practical concern was that a flight’s status could change as the FAA restriction and airport capacity evolved. The stop affected departures nationally, but the available information did not establish the final number of affected flights, cancellations or travelers.
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Communications Failure Behind the Alert
Mullin said the working explanation was a telecommunications outage, while stressing that officials had not ruled out other causes. He said President Donald Trump had been briefed. Officials speaking to NBC News said the investigation was at an early stage and that they had not seen signs normally associated with a cyberattack. They cautioned that their assessment could change as investigators learned more.
Three senior officials told NBC News they saw no indication of a connection to a Microsoft outage the previous day. Air Space Intelligence, a company that supplies technology for the FAA’s SMART air traffic control system, said its software was not responsible for the ground stop. The FAA alert itself did not identify the affected equipment or system.
Aviation safety expert Jeff Guzzetti told NBC News that pilots are trained to handle communications outages and that alternative ways to relay information can help aircraft maintain safe spacing. He said the reported failure affected high-altitude control centers, distinct from midlevel control and airport towers. The report did not specify which communications links failed or how air traffic control operations were coordinated during the disruption.
““Due to extraordinary circumstances and for reasons of safety.””
— Federal Aviation Administration alert
Cause and Duration Still Unknown
The FAA’s initial alert did not name the failed system, explain the precise cause or provide an end time. Mullin described a telecommunications outage as the explanation “as of now,” but officials had not completed their investigation. Their early statements that they had seen no evidence of malicious activity were provisional, and officials said that view could change.
It was also unclear how many flights would ultimately be delayed, canceled or diverted, how long airports would face capacity constraints, and when the FAA would lift the stop. The report did not provide a confirmed total of affected passengers or a final accounting of aircraft held on the ground.
FAA Review and Flight Resumption
Airlines and travelers were waiting for the FAA to provide further instructions and lift or revise the ground stop. Until then, the agency’s order meant new departures could not proceed, while inbound international flights were subject to case-by-case management. Airlines would need to update customers as flight plans and airport capacity changed.
Investigators were expected to continue examining the communications failure and whether any other systems were affected. The source report provided no timetable for a technical update or for a return to normal operations. Travelers should check their airline’s flight status and airport advisories before leaving for the airport, since the reported conditions were developing.
Key Questions
What did the FAA order?
The FAA ordered all departing flights nationwide to remain grounded until further notice, citing extraordinary circumstances and safety. It said inbound international flights would be handled case by case.
Were planes already in the air told to land?
The source report said aircraft already airborne continued their flights. Mullin said passengers on those planes had no reason for concern, and United said its airborne flights would continue.
What caused the ground stop?
The cause was not confirmed in the report. Mullin said officials were investigating a telecommunications outage, while noting that they were not ruling out other possibilities. Officials said their early assessment could change.
How many passengers and flights were affected?
No final official count was provided. NBC News cited an expert estimate of 300,000 to 400,000 passengers potentially stranded several hours after the order and a separate estimate of 3,000 to 4,000 flights held up over more than two hours. These were estimates, not confirmed totals.
When would departures resume?
The FAA’s alert gave no end time. Departures were to remain stopped until further notice, and the source report did not say when the agency would lift the restriction.
Source: nbcnews.com
