The unprecedented disruption to normal flight operations began shortly before 4 p.m. Eastern time, when the FAA instructed airports to suspend departures until further notice. The emergency order affected commercial airlines and other aircraft preparing to take off, creating widespread delays and cancellations as federal officials worked to determine what caused the failure.
The FAA issued the emergency directive citing “extraordinary circumstances and for reasons of safety,” an unusually broad warning reflecting the seriousness of the communications problems.
A nationwide ground stop is an emergency measure that prevents aircraft from taking off while aviation officials address a safety concern. Unlike a routine airport delay, Friday’s order applied to departures across the country.
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Aircraft already in the air were permitted to continue toward their destinations and land. International flights arriving in the United States were being handled individually, while departing aircraft were instructed to remain on the ground unless specifically authorized to operate.
Transportation Secretary Sean Duffy confirmed that the nationwide ground stop followed communications problems affecting the FAA’s Air Route Traffic Control Centers.
These facilities manage aircraft traveling between airports, coordinating flight paths, altitude changes and the movement of planes through different sections of U.S. airspace.
According to aviation publication Skift, Duffy said the communications issue affected all of the country’s Air Route Traffic Control Centers, prompting federal officials to halt departures while technicians investigated.
The disruption raised immediate concerns about the ability of air traffic controllers to safely coordinate aircraft movements across the national aviation system.
The FAA has not publicly established the underlying cause of the communications failure.
Homeland Security Secretary Markwayne Mullin said investigators had not found evidence indicating that the outage resulted from a malicious cyberattack.
Speaking about the ongoing investigation, Mullin described the situation as a telecommunications outage and said federal officials were working to restore normal operations.
His comments did not definitively rule out a cyberattack or other technical problems. Investigators were still examining the circumstances surrounding the disruption.
Questions also emerged about whether the aviation failure was connected to a separate Microsoft service outage that disrupted computer systems Thursday.
Mullin said he had no reason to believe the incidents were connected. Microsoft also reported having no indication that the two outages were related.
No connection between the incidents has been independently established.
Friday’s nationwide ground stop is one of the rarest emergency actions taken by federal aviation authorities.
The last comparable nationwide departure suspension occurred on Jan. 11, 2023, when an outage involving the FAA’s Notice to Air Missions system forced officials to temporarily halt domestic departures.
That system provides pilots and flight crews with essential information about potential hazards, airport conditions and other safety issues before flights.
The 2023 disruption lasted less than two hours but created extensive problems throughout the aviation system. According to FlightAware figures reported by People, more than 9,500 flights were delayed and over 1,300 were canceled by that evening.
Before that incident, the most significant nationwide grounding occurred following the September 11, 2001, terrorist attacks, when federal authorities suspended civilian air traffic as part of an emergency security response.
Friday’s shutdown also comes amid continuing concerns about the reliability of the nation’s aging air traffic control infrastructure.
Congress approved approximately $12.5 billion in 2025 to modernize FAA communications equipment and other critical aviation systems, according to Reuters.
The FAA and White House have also requested an additional $30.1 billion from Congress to address remaining infrastructure problems.
Those funding efforts reflect longstanding concerns about outdated technology, equipment failures and the need to maintain reliable communications between pilots and air traffic controllers.
However, federal officials have not established whether aging infrastructure, recently introduced technology or another technical issue caused Friday’s nationwide failure.
For travelers, the immediate consequences extended far beyond airports where flights were originally scheduled to depart.
Airline operations depend on aircraft and crews moving between cities throughout the day. When departures are suspended nationwide, planes cannot reach their next destinations, flight crews may exceed federal working-hour limits, and airlines can struggle to restore normal schedules even after restrictions are lifted.
Passengers traveling for work, family emergencies, medical appointments and other obligations could face additional disruptions as airlines reorganize their operations.
Travelers scheduled to fly Friday evening or Saturday should check directly with their airlines before heading to the airport. Airlines are responsible for providing updated departure information, rebooking options and applicable refunds when flights are canceled or significantly changed.
Under Department of Transportation rules, passengers whose flights are canceled or significantly changed are generally entitled to refunds if they choose not to accept alternative transportation, regardless of whether the disruption was caused by the airline.
As of Friday evening, federal officials had not announced a definitive timeline for restoring normal nationwide operations.
The FAA’s emergency order initially directed departing flights to remain grounded until further notice, while air traffic officials worked to restore communications and determine when departures could safely resume.
The investigation remains ongoing, and the full extent of the disruption may not become clear until airlines complete their recovery operations and federal officials determine what caused the communications failure.
