🔍 Read the full analysis: Why The FAA Halted Flights Nationwide And What’s Still A Mystery on ThorstenMeyerAI.com
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TL;DR
The FAA ordered a nationwide ground stop on Nov. 13 after communications and equipment problems affected air traffic control facilities. Transportation Secretary Sean Duffy described overloaded legacy telecom equipment, 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 at U.S. airports on Friday, Nov. 13, after communications problems affected multiple air traffic control facilities, then lifted the order about four hours and 23 minutes later. Transportation Secretary Sean Duffy said the disruption involved instability in radar and communications systems; officials have not released a written report explaining the root cause.
The FAA Command Center’s advisories trace the first equipment-related trouble to Chicago. At 3:21 p.m. ET, the agency warned of arrival delays and airborne holding at O’Hare because of equipment issues. It stopped departures to O’Hare from across the United States and several Canadian airports at 3:28 p.m., citing “EQUIPMENT / OUTAGE” and “COMMS ISSUES.” Chicago Midway followed at 3:31 p.m. The advisories had previously cited weather and traffic for some delays.
At 3:54 p.m. ET, the Command Center issued a nationwide ground stop, directing departing aircraft to remain on the ground. The FAA said communications issues were affecting multiple Air Route Traffic Control Centers and that technicians were investigating. Its statement described the information as preliminary. The order was cancelled at about 8:16 p.m. ET; Duffy said the airspace reopened at 8:15 p.m.
Duffy said more than 3,500 aircraft were airborne when the stop began, falling to fewer than 400 by 8 p.m. Medevac flights, life-saving cargo and law enforcement flights were permitted to continue. FAA advisories said departures would be released as facilities recovered and coordinated with the Command Center. 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 totals cover all cancellations in those periods, not just those caused by the ground stop.
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 Air Travel
A nationwide departure hold can affect far more than flights scheduled during the order. Aircraft and crews may be left in the wrong places, and cancellations or delays can continue after the FAA lifts a restriction as airlines work to rebuild schedules. The continuing airport-specific and airline-specific ground stops later Friday reflected that recovery process.
The effects also reached outside the United States. Eurocontrol suspended U.S.-bound departures from its member states at the FAA’s request between 10 p.m. UTC Friday and 5 a.m. UTC Saturday, according to a notice cited by Xinhua. BBC News reported that Sydney Airport held U.S.-bound flights and Air Canada cancelled flights between Canada and the United States. For travelers and businesses relying on air cargo, the scale and cause of the disruption matter because both recovery time and future risk depend on what failed and how it is repaired.
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From Chicago Delays to a National Hold
The FAA’s public advisories show a progression from delays at Chicago-area airports to restrictions across the country. At 3:30 p.m. ET, the Command Center activated a diversion recovery tool for all airports. After the national order, it warned of airborne holding at any airport and extended the time allowed for filed flight plans to remain active to 240 minutes, citing a nationwide communications failure.
By 5:46 p.m., the FAA said flights could depart as en route facilities recovered, but only through coordination with the Command Center. At 7:37 p.m., it reported that some coastal facilities had begun releasing some international departures. The nationwide order was cancelled shortly afterward. The sequence indicates a staged recovery rather than an immediate return to normal operations.
Duffy attributed the problem to aging infrastructure. He said that at 3:36 p.m. ET the FAA experienced radar and communications instability at en route centers and approach control facilities. He described analog telecom switches and routers as overloaded with data and delivering inconsistent information. The FAA has 21 en route centers, according to a 2023 FAA-commissioned review. Duffy said the system was not a total blackout: “We didn’t lose all telecom we didn’t lose all radar.”
“ALL AIRPORTS ARE GROUND STOPPED.”
— FAA Command Center advisory
The Cause Has Not Been Documented
The key unresolved issue is the precise technical cause. Duffy’s account points to overloaded analog telecom switches and routers, but the FAA has not published a written root-cause report describing which equipment failed, why it became unstable, or how the failure spread from the initial Chicago-area problems to facilities nationwide. The FAA’s initial statement was explicitly preliminary and subject to change.
Mullin said officials had seen no evidence of a cyberattack and that the problem appeared mechanically driven, while cautioning that investigators would not rule cyber activity out. Duffy and the maker of the FAA’s SMART air-traffic tool said the new AI system was not connected to the affected equipment. Those statements address the suspected causes, but do not substitute for a published technical investigation. The extent of any lasting equipment damage and the full operational cost of the disruption are also not established in the source material.
FAA Review and Infrastructure Funding
The immediate next step is for the FAA to complete its investigation and publish findings that identify the failed components, the chain of events, and any steps taken to prevent a repeat. Until a fuller account is available, the agency’s advisories and officials’ statements provide the main public explanation, but leave important technical questions open.
Duffy has called for $50 billion in congressional funding for a new system, warning that similar disruptions could occur without modernization. That is his assessment and funding proposal, not a confirmed forecast or an enacted plan. The source material does not specify a congressional timetable, a replacement schedule, or a date for the FAA’s written report. Travelers should check airline updates for any continuing schedule changes while the system and carriers recover.
Key Questions
Why did the FAA halt flights nationwide?
The FAA cited communications issues affecting multiple air traffic control centers. Duffy said radar and communications became unstable and described legacy telecom equipment as overloaded, but a written root-cause report has not been published.
How long did the nationwide ground stop last?
The FAA advisories place the event from about 3:53 p.m. to 8:16 p.m. ET on Nov. 13, or roughly four hours and 23 minutes. Duffy said airspace reopened at 8:15 p.m.
Was the disruption caused by a cyberattack?
Officials had not established that. Homeland Security Secretary Markwayne Mullin said investigators had seen zero evidence of a cyberattack and that the issue appeared mechanically driven, while saying they would not rule cyber activity out.
Did the FAA’s new AI traffic tool cause the outage?
Duffy and the maker of the FAA’s SMART air-traffic tool said it was not connected to the equipment involved in the failure. The available material does not include a published technical report detailing the investigation.
How many flights were cancelled?
FlightAware counted 9,159 cancellations on Friday within, into or out of the United States and another 3,515 by 7:58 a.m. ET Saturday. The figures include all cancellations in those periods, not only cancellations attributed to the FAA’s ground stop.
Source: ThorstenMeyerAI.com
