🔍 Read the full analysis: Nationwide FAA Flight Halt: A Look At The Disruption And Unknowns on ThorstenMeyerAI.com
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TL;DR
The FAA ordered a nationwide ground stop on Nov. 13 after officials reported instability affecting radar and communications at air traffic facilities. The stop lasted about four hours and 23 minutes; officials have not published a written root-cause report, and they say a cyberattack has not been ruled out.
The Federal Aviation Administration halted departures from all U.S. airports for about four hours and 23 minutes on Friday, Nov. 13, after officials reported instability in radar and communications at air traffic control facilities. The disruption affected domestic and international flights, but the FAA has not released a written account identifying the underlying cause.
The FAA Command Center issued its nationwide ground-stop advisory at 3:54 p.m. Eastern Time, citing “extraordinary circumstances” and safety. The advisory’s event time began at 3:53 p.m. and instructed departing traffic to remain on the ground. Inbound international flights were to be handled case by case. The FAA’s cancellation notice lists 8:16 p.m. ET as the end; Transportation Secretary Sean Duffy said the airspace reopened at 8:15 p.m.
The problem had surfaced earlier near Chicago. At 3:21 p.m., an FAA advisory cited equipment issues affecting arrivals at O’Hare. The agency restricted departures to O’Hare at 3:28 p.m. and to Midway at 3:31 p.m. Duffy said the wider instability began at 3:36 p.m., affecting radar and communications at en route centers and approach control facilities around the country.
Duffy said more than 3,500 aircraft were airborne when the national stop began, falling to fewer than 400 by 8 p.m. Medevac flights, life-saving cargo and law enforcement flights were allowed to continue. FAA advisories described communications problems and said flights would be released as facilities recovered, with coordination from 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 figures include all cancellations on those dates, not just flights attributable to the ground stop. The source also reports 9,896 cancellations worldwide on Friday; the counts use different geographic scopes and should not be conflated.
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 Spread Beyond Airports
A nationwide halt to departures can disrupt travel across the country even when aircraft already in the air continue to land. Grounded flights leave passengers waiting and can strand aircraft and crews away from their next scheduled routes. The effects may continue after a stop is lifted as airlines work through delays, cancellations and repositioning.
The disruption also reached international operations. According to the source report, Eurocontrol suspended U.S.-bound departures from its member states at the FAA’s request from 22:00 UTC Friday to 05:00 UTC Saturday. BBC News reported that Sydney Airport held U.S.-bound flights and Air Canada cancelled flights between Canada and the United States. These measures show how a U.S. air traffic disruption can affect travel beyond U.S. airports.
For travelers, the published cancellation totals give a sense of the scale but do not establish how many cancellations were directly caused by the FAA order. Passengers need to check their airline for the status of an individual itinerary; the available figures are not a count of passengers affected or of delays alone.
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From Chicago Equipment Alerts to a National Stop
The FAA’s public advisories trace the developing disruption from Chicago airport alerts to a nationwide restriction. Before equipment problems were cited, some Friday advisories referred to weather and traffic conditions. The first equipment-related notice in the supplied records, at 3:21 p.m. ET, warned of arrival delays and airborne holding into O’Hare. Departures to O’Hare were then stopped, followed by Midway.
After the nationwide order, the Command Center told operators to expect holding at airports and extended the period that filed flight plans could remain active to 240 minutes, citing a nationwide communications failure. Later notices said departures could resume as en route facilities recovered and were coordinated. At 7:37 p.m., the center said some coastal facilities had released some international departures. The national stop was cancelled shortly after 8 p.m., though airport- and airline-specific restrictions continued into the night.
The FAA’s statement described communication issues affecting multiple Air Route Traffic Control Centers and said technicians were investigating. A 2023 FAA-commissioned review counted 21 en route centers, which largely manage aircraft between airports. That background helps explain the potential reach of the reported disruption, but it does not establish which equipment failed or how the problem began.
““We didn’t lose all telecom we didn’t lose all radar.””
— Transportation Secretary Sean Duffy
Cause and Recurrence Still Unresolved
The precise root cause has not been established publicly. Duffy said old analog telecom switches and routers became overloaded with data and delivered inconsistent information. The supplied source material does not include a published technical report confirming that account, identifying the specific failed components, or explaining why the instability occurred across facilities.
Mullin said officials had seen no evidence of a cyberattack but did not rule one out. Duffy and the maker of the FAA’s new SMART traffic tool said that system was not connected to the equipment involved. The source material does not provide independent technical findings to verify those statements or explain the full scope of the investigation.
The exact number of passengers affected and the share of cancellations directly caused by the ground stop are also not established by the cited totals. The flight counts cover all cancellations within their stated dates and geographic scopes, not only those linked to the FAA action. The source gives differing times for the reopening—8:15 p.m. in Duffy’s account and 8:16 p.m. in the FAA notice—while the recorded cancellation time is 8:16 p.m.
FAA Investigation and System Funding
The FAA said its technicians were investigating, but the source material does not identify a date for a final findings report. The next key development is a public explanation of which equipment or systems failed, how they produced the reported instability, and what corrective steps the agency will take. Until those findings are available, accounts of the cause should be treated as officials’ descriptions rather than a completed technical determination.
Duffy said he wants $50 billion for a new system and warned that similar disruptions could recur without new funding. That is his assessment and funding request, not a confirmed forecast or an enacted spending plan. Congress’s response, any FAA modernization schedule, and whether immediate fixes will be made were not specified in the source material.
Travelers with affected bookings should follow updates from their airlines and check flight status before going to the airport. Further FAA advisories and any investigative findings will clarify whether the disruption was limited to the reported equipment instability and what measures may reduce the risk of another nationwide stop.
Key Questions
When did the FAA’s nationwide ground stop happen?
The FAA issued the order on Friday, Nov. 13, 2026, at 3:54 p.m. ET. Its cancellation notice lists 8:16 p.m. ET as the end, a span of about four hours and 23 minutes using the advisory event times.
What caused the flight halt?
Officials described instability affecting radar and communications at air traffic control facilities. Duffy attributed it to overloaded older telecom switches and routers, but the FAA had not published a written root-cause report in the supplied material.
Was the disruption caused by a cyberattack?
Homeland Security Secretary Markwayne Mullin said officials had seen zero evidence of a cyberattack, while adding that they were not ruling one out. The cause remains under investigation.
How many flights were cancelled?
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. The totals cover all cancellations in those periods, not only those caused by the ground stop.
Could another nationwide stop happen?
Duffy warned that more disruptions could occur without investment in a new system and called for $50 billion in funding. That was his assessment; the source material does not establish that another stop is certain or provide a timetable for system replacement.
Source: ThorstenMeyerAI.com
