🔍 Read the full analysis: A Nationwide Flight Halt: The FAA’s Known Facts And Unanswered Questions on ThorstenMeyerAI.com
TL;DR
The FAA ground-stopped departures at U.S. airports on Nov. 13 after officials reported radar and communications instability at facilities across the country. Transportation Secretary Sean Duffy attributed the problem to overloaded legacy telecom equipment, while Homeland Security Secretary Markwayne Mullin said officials had seen no evidence of a cyberattack. The FAA has not published a written root-cause report.
The FAA halted departures from U.S. airports nationwide on Nov. 13 after communications problems affected multiple air traffic control facilities, keeping the restriction in place for about 4 hours and 23 minutes. The agency’s advisories cite safety and equipment issues; Transportation Secretary Sean Duffy described instability in radar and communications, but the FAA has not released a written account establishing the failure’s root cause.
The FAA Command Center’s first advisories naming equipment trouble concerned Chicago. At 3:21 p.m. ET, it warned of delays and airborne holding for flights into O’Hare because of equipment issues. At 3:28 p.m., it stopped departures to O’Hare from across the United States and several Canadian airports, citing “EQUIPMENT / OUTAGE” and “COMMS ISSUES.” Chicago Midway followed at 3:31 p.m.
The nationwide notice followed at 3:54 p.m. ET, with the advisory’s event time listed as 3:53 p.m. It said all airports were ground-stopped “for reasons of safety” and directed departing traffic to remain on the ground. The FAA said communication issues had affected multiple Air Route Traffic Control Centers and that technicians were investigating. It described that statement as preliminary and subject to change.
Duffy said the FAA experienced radar and communications instability at en route centers and approach control facilities beginning at 3:36 p.m. ET. He said overloaded analog telecom switches and routers delivered inconsistent data, but stressed it was not a complete loss of radar or telecommunications. The FAA’s cancellation advisory listed 8:16 p.m. as the stop’s end; Duffy said the airspace reopened at 8:15 p.m.
Duffy said more than 3,500 aircraft were airborne when the halt began and fewer than 400 remained in the air by 8 p.m. Medevac, life-saving cargo and law enforcement flights were allowed to continue. As facilities recovered, the FAA coordinated some departures, including international flights, before cancelling the nationwide restriction.
FlightAware counted 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 all-day cancellation totals, not counts attributed solely to the ground stop. The source material also reports that European authorities suspended US-bound departures from member states for several hours at the FAA’s request.
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
Disruption Reached Beyond U.S. Airports
A nationwide departure halt affects passengers well beyond flights that are stopped immediately. Aircraft and crews can end up in the wrong places, and missed connections and duty-time limits can carry disruption into later flights. The cancellation totals show the scale of travel disruption on those dates, but they do not isolate how many cancellations the FAA action caused.
The incident also affected international operations. The source material says Eurocontrol suspended US-bound departures from its member states between 22:00 UTC Nov. 13 and 05:00 UTC Nov. 14 at the FAA’s request; it also reports US-bound flights held at Sydney Airport and Air Canada cancellations between Canada and the United States. Those measures show how a domestic air traffic restriction can affect routes and schedules abroad.
For travelers, the practical issue is that lifting a ground stop does not immediately restore normal schedules. Airlines still have to reposition aircraft, crews and passengers. For aviation operators, the event raises questions about communications infrastructure relied on for safe air traffic management. Duffy warned that similar events could recur without investment in a replacement system, but that is his assessment, not a published FAA finding about the likelihood of another outage.
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Chicago Advisories Preceded the Halt
The FAA’s public advisories trace the disruption from Chicago to a nationwide restriction. After the O’Hare and Midway measures, the Command Center activated a diversion recovery tool for all airports at 3:30 p.m. It then issued the national stop less than half an hour after its first Chicago equipment warning.
During the halt, the FAA extended flight-plan drop times for all en route centers to 240 minutes, allowing plans to remain active longer while aircraft waited. A later advisory said flights would be released as en route facilities recovered and in coordination with the Command Center. The agency’s advisories identify the operational response, but do not provide a complete technical diagnosis.
The FAA-commissioned review cited in the source material counted 21 en route centers. These facilities largely manage aircraft traveling between airports, while approach control facilities handle traffic closer to airports. That distinction helps explain why problems described at both kinds of facilities prompted a broad restriction, though the source material does not specify which equipment failed at each site.
„ALL AIRPORTS ARE GROUND STOPPED.“
— FAA Command Center advisory
The Failure’s Root Cause Is Unpublished
The FAA has not published a written root-cause report, and its initial statement was explicitly preliminary. Duffy attributed the disruption to overloaded legacy telecom switches and routers, but the available material does not include an independent technical investigation explaining how the equipment failed, how many facilities were affected, or why the problem spread from Chicago to a nationwide stop.
Mullin said officials had found no evidence of a cyberattack and described the problem as apparently mechanical, while also saying they would not rule cyber activity out. That leaves cyber involvement unconfirmed, not established. Duffy and the maker of the FAA’s SMART traffic tool said the tool was not connected to the failed equipment. The source material provides no technical report independently documenting those statements.
It is also unclear how many cancellations and delays resulted directly from the ground stop rather than other causes or the knock-on effects of disrupted schedules. The reported daily cancellation figures include all cancellations, and no separate event-attributed total is provided.
FAA Investigation and Funding Debate
The FAA said technicians were investigating, but the source material gives no date for a final report or a detailed public briefing. The next substantive update would need to clarify the equipment involved, the sequence of failures, the safety checks used before flights resumed and whether corrective work is planned.
Duffy has called for $50 billion for a new system and warned that similar disruptions could recur without funding. The source material does not establish that Congress has approved the request, or provide a timetable for replacing the equipment. Passengers and airlines may continue to face schedule effects after the formal stop ends, while officials’ technical account remains incomplete.
Key Questions
When did the FAA ground stop begin and end?
The FAA advisory listed an event start of 3:53 p.m. ET on Nov. 13 and an end at 8:16 p.m. Duffy said the airspace reopened at 8:15 p.m. The advisory times indicate a halt of about 4 hours and 23 minutes.
What did officials say caused the disruption?
Duffy said radar and communications became unstable and attributed inconsistent data to overloaded legacy telecom switches and routers. The FAA has not published a written root-cause report, so the detailed technical explanation remains incomplete.
Was the ground stop caused by a cyberattack?
Officials had not confirmed a cyberattack. Homeland Security Secretary Markwayne Mullin said officials had seen no evidence of one and that the problem appeared mechanically driven, while adding that they would not rule it out.
How many flights were cancelled because of the stop?
The source material does not give a count of cancellations caused specifically by the ground stop. FlightAware recorded 9,159 cancellations within, into or out of the United States on Friday and 3,515 more by 7:58 a.m. ET Saturday, but those totals include cancellations for other reasons.
Could a similar disruption happen again?
Duffy warned that more such events could occur without funding for a replacement system. That is his assessment; the source material does not give an FAA estimate of recurrence risk or a confirmed replacement timetable.
Source: ThorstenMeyerAI.com
