🔍 Read the full analysis: FAA’s US Airport Flight Halt: Key Facts And Unanswered Questions on ThorstenMeyerAI.com
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TL;DR
The FAA halted departures from U.S. airports on Nov. 13 after communications and radar instability affected air traffic facilities. Transportation Secretary Sean Duffy described overloaded legacy equipment as the cause, while Homeland Security Secretary Markwayne Mullin said officials had found no evidence of a cyberattack but had not ruled one out. The FAA has not published a written root-cause report.
The Federal Aviation Administration halted departures from all U.S. airports on Friday, Nov. 13, after communications problems affected multiple air traffic control facilities, disrupting domestic and international travel for more than four hours. The FAA’s advisories put the stop from about 3:53 p.m. to 8:16 p.m. Eastern Time; officials have described a failure involving aging communications equipment, but the agency has not issued a written root-cause report.
The FAA Command Center’s first advisories tied the disruption to Chicago-area equipment problems. At 3:21 p.m. ET, it warned of arrival delays and airborne holding at O’Hare, citing equipment issues. At 3:28 p.m., it stopped departures to O’Hare from across the United States and some Canadian airports, listing “EQUIPMENT / OUTAGE” and “COMMS ISSUES.” Chicago Midway’s departures were stopped shortly afterward.
At 3:54 p.m., the Command Center issued a nationwide order stating that all airports were ground-stopped, with departing traffic held until further notice. The FAA said communication issues had affected multiple Air Route Traffic Control Centers and that technicians were investigating. Its statement described the information as preliminary. International arrivals were to be managed case by case, and the advisories allowed some emergency and other specified flights to continue.
Transportation Secretary Sean Duffy said more than 3,500 aircraft were airborne when the stop began and fewer than 400 remained in the air by 8 p.m. He said the FAA experienced instability in radar and communications at en route centers and approach control facilities. The Command Center later allowed departures to resume through coordination as facilities recovered; the nationwide stop was canceled at 8:16 p.m., although local and airline-specific restrictions continued.
FlightAware recorded 9,159 cancellations within, into or out of the United States on Friday, and 3,515 more on Saturday by 7:58 a.m. ET. Those figures count all cancellations during those periods, not just flights canceled because of the FAA order. They show the scale of the disruption but do not establish how many cancellations the ground stop caused.
FAA ground stop · Nov 13, 2026 · times ET (UTC−5)
Unreliable data, a full stop, a slow restart
What the FAA Command Center’s advisories and Transportation Secretary Sean Duffy describe, step by step.
US airspace (schematic)
plane (schematic)airports
3,500+ planes in the airwhen the stop began, Duffy says Fewer than 400still airborne by 8 p.m. ET, Duffy says Restartground stop cancelled; flights resume slowly
What the FAA and Duffy said
- 3:21 p.m.Chicago O’Hare: arrival delays “due to equipment issues”FAA advisory 106
- 3:36 p.m.Radar and communications unstable at centers and TRACONs nationwideDuffy
- 3:54 p.m.“All airports are ground stopped”; departures heldFAA advisory 111
- 4:20 p.m.Airborne holding expected at “any and all airports”FAA advisory 116
- 8 p.m.Fewer than 400 planes still airborne, down from 3,500+Duffy
- 8:16 p.m.Nationwide ground stop cancelled; Duffy: airspace reopened at 8:15 p.m.FAA advisory 005
Sources: FAA Air Traffic Control System Command Center advisories 106, 111 and 116 (Nov 13) and 005 (Nov 14, 2026, UTC dates); Transportation Secretary Sean Duffy at the White House briefing, Nov 13 (transcript: Roll Call Factba.se) and on X (as quoted by Fox Business); BBC News, Nov 14. Durations: own calculation from advisory event times (2026: 20:53 to 01:16 UTC; 2023: 12:20 to 14:00 UTC). The radar picture is a schematic, not real traffic.
Graphic: Powered by Thorsten Meyer AI
How the Stop Disrupted Travel
The order constrained departures nationwide, while arriving aircraft already in the air had to be managed as facilities dealt with the communications problems. The disruption spread beyond U.S. airports: according to reporting cited in the source material, Eurocontrol suspended U.S.-bound departures from its member states at the FAA’s request, and airports in Sydney held some U.S.-bound flights. Air Canada also canceled flights between Canada and the United States.
For travelers, a ground stop ending does not immediately return airline schedules to normal. Aircraft and crews may be in different locations from where they are needed, and flights can continue to be delayed or canceled after the restriction is lifted. The FAA advisories show that airport-specific and airline-specific stops continued into the night as carriers worked through the disruption.
The incident also puts attention on the reliability of the communications and control systems used to manage aircraft. Duffy said another disruption of this kind could occur without investment in replacement systems. His request for $50 billion is a policy proposal, not an approved funding commitment or a confirmed estimate of the cost of this particular incident.
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From Chicago Problems to Nationwide Stop
The FAA advisories show a progression from local disruption to a national restriction. Chicago-area delays and departure stops were reported before the nationwide order. At 3:30 p.m., the Command Center activated a diversion recovery tool for all airports. Duffy said the broader system problem began at 3:36 p.m.; the national stop followed about 18 minutes later.
During the stop, the FAA extended flight-plan drop times for en route centers to 240 minutes, allowing filed plans to remain active longer while flights waited. A later advisory said recovering facilities would release flights in coordination with the Command Center. Some coastal facilities began releasing international departures before the nationwide stop was canceled.
The source material says the FAA has 21 en route centers, citing a 2023 FAA-commissioned review. These centers largely manage aircraft traveling between airports. The public advisories refer to communications issues and equipment outages; Duffy supplied a more specific account of overloaded legacy switches and routers.
“We didn’t lose all telecom we didn’t lose all radar.”
— Transportation Secretary Sean Duffy
The Cause Has Not Been Fully Documented
The FAA has not published a written report establishing the root cause, the equipment involved, or the sequence of failures. Duffy attributed the instability to older analog telecom switches and routers that became overloaded with data, but the FAA’s public statement identified communication issues without providing that level of detail. The agency marked its account preliminary and subject to change.
Mullin said officials had seen no evidence of a cyberattack and characterized the problem as apparently mechanical, while adding that investigators had not ruled out a cyberattack. That statement is not a final finding. Duffy and the maker of the FAA’s new SMART traffic tool said it was not connected to the failed equipment; the available source material does not provide a technical investigation report independently documenting the system’s role.
The full operational and financial effects are also not established by the cancellation totals. FlightAware’s figures cover all cancellations during the stated periods, not only those attributable to the ground stop. The available account does not give a final count of affected passengers, the precise cause of each cancellation, or when the system’s longer-term repairs will be completed.
Investigation and System Funding
The FAA said technicians were investigating, but no publication date for a final findings report or further technical update is given in the source material. The agency’s advisories and any later official findings will be needed to clarify which equipment failed, why it produced instability across facilities, and what corrective measures are planned.
Congress would have to decide whether to provide the $50 billion Duffy requested for a new system; the source material does not report an enacted appropriation. In the meantime, airlines and airports must continue managing schedule recovery and any local restrictions. Travelers should check directly with their airline for current flight status, since the nationwide restriction’s cancellation did not itself resolve the resulting schedule disruption.
Key Questions
When did the FAA ground stop begin and end?
The FAA Command Center’s advisories place the nationwide stop from about 3:53 p.m. ET on Nov. 13 until its cancellation at 8:16 p.m. ET. Duffy said the airspace reopened at about 8:15 p.m.
What did officials say caused the disruption?
Duffy attributed the problem to instability in radar and communications and said older analog switches and routers became overloaded with data. The FAA’s initial statement cited communication issues affecting multiple air traffic control centers. A written root-cause report has not been published.
Was the FAA outage a cyberattack?
Mullin said officials had seen zero evidence of a cyberattack and that the incident appeared mechanically driven, but he said investigators were not ruling that possibility out. The available information does not establish a final finding.
How many flights were canceled because of the stop?
The source reports 9,159 cancellations within, into or out of the United States on Friday and 3,515 more by 7:58 a.m. ET Saturday. Those are totals for the periods, not counts limited to cancellations caused by the FAA ground stop.
Could another nationwide ground stop happen?
Duffy warned that similar disruptions could happen again without investment in new systems and called for $50 billion. That is his assessment and funding request; the source material does not establish how likely another event is or whether Congress will approve the money.
Source: ThorstenMeyerAI.com
