FAA issues national ground stop – lifted 4.5 hours later

1637 points - last Friday at 9:05 PM

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Comments

Alexsky2 yesterday at 3:21 AM
For those interested, there was a 2009 outage of the FAA Telecommunications Infrastructure that at a surface level seems like it could be a similar failure mode. At the very least, it is an interesting read on how the FAAs systems operate, since a lot of the discussion so far has been wild speculation from people with little knowledge on how the national airspace system actually operates: https://www.oig.dot.gov/library-item/29670

Of particular note is this section: Risks of FTI Outages for Existing Operational Services As of December 2009, Harris reported that there are a total of 20,982 services operating on the FTI network. While FAA has transitioned all 1,808 IP services supporting FAA flight plans to the new FTI fiber optic network, additional risks will be introduced when the Agency begins transitioning other FAA services, such as En Route Automation Modernization (ERAM) and NextGen platforms, which also require IP technology to operate. Moreover, there are 19,174 existing services that may be transitioned to the new FTI fiber optic network. According to FAA, transitioning these remaining services is important because FTI now connects older FAA systems that provide safety-critical voice and surveillance radar information by utilizing Time Division Multiplex (TDM) technology, instead of IP services.

fooey last Friday at 11:50 PM
starting to see some explanations for what's going on

https://www.wsj.com/us-news/faa-temporarily-halts-flights-ac...

> The outage appears to be affecting a telecommunications network overseen by L3Harris Technologies, according to people briefed on the matter. The network handles crucial radio frequencies that air-traffic controllers use to communicate with pilots, the people said. It wasn’t immediately clear whether the outage also affected the radar feeds that controllers use to keep aircraft safely separated in the skies.

https://www.cbsnews.com/news/faa-issues-nationwide-ground-st...

> An update to the private communications network that connects America's air traffic control system caused the system to reboot, leading to a crash and a communications outage, multiple sources told CBS News. The system is operated by L3Harris, which did not immediately respond to CBS News' request for comment.

Animats last Friday at 10:19 PM
Info on this is amazingly sparse. Apparently Sec. Duffy posted something on X/Twitter, and that's all the news media have.

Looking at LAX departures, it looks like nothing has departed since about 10:30 AM PST, and everything later is showing Delayed or Cancelled. There are times after Delayed, but it's not clear those times mean anything. Some are now in the past.

"flysfo.com" is too overloaded to display departures. Stuck at "loading...".

JFK departure status shows almost solid "Delayed".

No good explanations anywhere.

elicash yesterday at 2:18 AM
Here's what they said caused it in the White House briefing:

Sec Mullin: "What it appears to be right now is, as Sec Duffy and FAA was going in and putting patches into the system, they were putting new equipment and new technology. And that new equipment and new technology, it was overwhelming the older system. Which is why Sec Duffy made it very clear, the patchwork doesn't work. We need one complete system."

amluto last Friday at 9:52 PM
I have no idea whether this particular failure was Microsoft's fault, but I was in the air on September 14, 2004 when a substantial portion of the southwestern US's air traffic control went down:

https://spectrum.ieee.org/lost-radio-contact-leaves-pilots-o...

(I was near ORD at the time, flying toward the outage area. We diverted to ORD, and the pilot was very friendly about it.)

At the time I thought it was Microsoft's fault, as Windows 95 and 98 were susceptible to crashing when GetTickCount() overflowed, and this ATC crash was due to a 32-bit millisecond counter on a Windows machine overflowing, but in this particular instance the system was apparently not running on a version of Windows with this particular bug and the failure was just an application error.

Aren't computers great? :)

nxobject last Friday at 10:12 PM
Secretary Mullin/DHS is confirming that this will likely be an extended outage...

> “This isn’t going to just be be resolved and turned around within the hour"

https://www.nytimes.com/live/2026/11/13/us/ground-stop-natio...

throwitaway222 last Friday at 9:28 PM
Anyone have a screen shot? I just see "NO Advisory"

edit: https://www.fly.faa.gov/ois/oisedit/adv_oisedit_dis?number=1...

mikewarot last Friday at 10:11 PM
I'm watching it live on ADSBexhange, here's a flight I picked at random going approximately past me that'll land in Detroit about an hour from now... there's not much left over the US over 40,000 feet. Only 2 planes over Indiana at that altitude right now.

https://globe.adsbexchange.com/?icao=a519b8

It's Delta Airlines flight 1070

https://www.flightaware.com/live/flight/DAL1070

Edit: It landed safely. Continuing to watch our airspace clear out, most traffic at 40,000+ feet is inbound international flights

armcat last Friday at 9:44 PM
More info on AP [1]. Looks like a comms issue. The figures they quoted for the overhaul are absolutely insane - almost $45 billion (I used to work in telecom):

> "The government has been working to overhaul the outdated technology that air traffic controllers rely on since Congress approved $12.5 billion for the project last year."

> "Duffy has said that another $30 billion will be needed to complete the work, and the White House has begun lobbying Congress to approve it."

[1] https://apnews.com/article/flights-halted-airports-faa-f81b0...

sega_sai yesterday at 11:52 AM
Having read the NYT report about "what we know" https://www.nytimes.com/2026/11/13/us/faa-ground-stop-flight... and the fact the transport secretary immediately pointed at specific issue (overloaded routers) without any investigation, combined with the fact that this revelation was intermediately followed by the request for money means that I will not trust what they are saying unless there is an independent investigation about what happened.
jbredeche last Friday at 9:21 PM
On a plane about to take off and obviously we didn’t. The captain is very confused and says he doesn’t know what this means.
cheesecakegood last Friday at 9:32 PM
Maybe I’m misremembering but hasn’t this only happened like, twice in recent memory? 9/11, and for like two hours two or three years ago
fotta yesterday at 1:30 AM
paxy last Friday at 9:18 PM
> DUE TO EXTRAORDINARY CIRCUMSTANCES AND FOR REASONS OF SAFETY

I'm sure there is a reason for it but can they not be a little bit more specific?

delichon last Friday at 9:32 PM
I wonder if this will close the Starship launch window starting at 5:45pm EST. The FAA issued the commercial launch license earlier today. That launch is under a separate set of "commercial space rules", but presumably they need to coordinate with air traffic control.

Update: Starship launched on schedule.

sixhobbits last Friday at 10:27 PM
Botched rollout of AI for ATC announced yesterday as rolling out nationwide?

> The agency wrote on Nov. 10 that after the D.C. test, it will “now use SMART in the airspace of all 22 centers across the country to reduce delays, reduce fuel consumption and improve the travel experience for the flying public.” The tech was already being deployed at some airports.

https://gizmodo.com/the-faa-is-rolling-out-its-ai-air-traffi...

amanaplanacanal last Friday at 11:47 PM
> An update to the private communications network that connects America's air traffic control system caused the system to reboot, leading to a crash and a communications outage, multiple sources told CBS News. The system is operated by L3Harris, which did not immediately respond to CBS News' request for comment.
jumploops last Friday at 9:40 PM
Seems related to the rollout of their new AI tool? [0]

[0]https://gizmodo.com/the-faa-is-rolling-out-its-ai-air-traffi...

cogogo last Friday at 9:39 PM
I do not really understand what the FAA means by “inbound international flights will be managed on a case by case basis.”

I am watching planes stacked up on final approach to land at KBOS as I type. From flight radar 24 they are a mix of foreign and domestic. So incoming flights are clearly being managed here.

Does this imply some potential risk from inbound international air traffic? Or maybe the FAA meant outbound? Something else I am missing?

peterbell_nyc last Friday at 9:45 PM
My wife is on a plane on the ground at ORD (they just landed) and they have been told they can use the restrooms but can't get off the planes. Any reason why folks wouldn't be allowed to deplane at the end of the journey if it was a radar or comms issue? They can pull up to the gate using flags . . .

Is it something else?

souvlakee yesterday at 1:57 AM
The reason field is empty, but the website footer provides enough information to understand.
isatty yesterday at 1:50 AM
Do we have any indication of what went wrong? The incident report will be very interesting.
ptaffs yesterday at 12:16 AM
United just departed EWR Newark for Tel Aviv https://www.flightradar24.com/UAL84/42909d99

And several from IAD Dulles. https://www.flightradar24.com/UAL992/4290a5d2

All seem to be international though.

https://apnews.com/live/ground-stop-aviation-flights-news-up...

starkparker yesterday at 3:11 AM
Since the threads keep getting closed about Hawaii DoT confusing everyone by claiming SpaceX debris was contributing to their shutdown despite the Starship launch being in Texas, successfully reaching orbit, and having a booster land in the Atlantic:

Hawaii was the early/late splashdown site and pre-cleared: https://www.cbsnews.com/news/spacex-launches-starship-flight...

SpaceX released the early return around 4 p.m. Pacific: https://x.com/TrackingTheSB/status/2121392533418786992

HDOT phrased it badly, but there was a window today where Starship could have aborted over the west coast in the middle of this shutdown.

cobychapple last Friday at 10:52 PM
Connected? "US National Weather Service reports nationwide internet, communications issues" (Reuters) https://www.reuters.com/technology/us-national-weather-servi...
sota_pop last Friday at 10:11 PM
Wonder if this is related upstream or tangentially?:

https://www.news9.com/oklahoma-city-news/national-weather-se...

binsquare last Friday at 9:22 PM
Likely Atc system outage, saw this at Chicago

https://www.cbsnews.com/chicago/news/ground-stop-chicago-oha...

lisper yesterday at 1:36 AM
CNBC is reporting that the ground stop has been lifted: https://www.cnbc.com/2026/11/13/faa-ground-stop.html?update
DebtDeflation last Friday at 9:31 PM
jondwillis last Friday at 9:30 PM
Oh cool, I’m on a plane rn about an hour from my destination.

Edit) landed pretty uneventfully.

hbarka yesterday at 11:20 AM
What I find more incredible is the ability of the thousands of pilots up in the air to be able to all execute perfect individual action in the fog of uncertainty. What is the secret sauce? I say perfect because it was 100%. Fantastic job. May all the trainers continue to do what they do best.
Animats last Friday at 9:41 PM
Use this link for latest advisory: https://www.fly.faa.gov/adv/

Current as of 1340 PDT:

    ATCSCC ADVZY 117 DCC 11/13/2026 ALL CENTERS EXTENDED FLIGHT PLAN DROP TIMES IMPLEMENTED

    MESSAGE: 
 

    EVENT TIME: 13/2120 - 14/0500
    CONSTRAINED FACILITIES: ZTL
    DCC HAS IMPLEMENTED EXTENDED FLIGHT PLAN DROP TIMES TO 240 MINUTES
    FOR ALL ENROUTE CENTERS DUE TO NATIONWIDE COMMS FAILURE. 
 

    EFFECTIVE TIME: 132121-140530

    SIGNATURE: 26/11/13 21:21
tiffanyh last Friday at 10:43 PM
From earlier this week on HN:

“FAA says it will phase out floppy disks from air traffic control”

https://news.ycombinator.com/item?id=50388001

kikoreis yesterday at 12:56 AM
Am sitting in GRU waiting for an outbound flight. Have just seen two flights (DL268 to ATL and DL313 to JFK) change to Boarding and now Last Call status.

My flight to the US is listed as Delayed but there are two flights to Canada that show Contact the Airline. Bewildering.

cout last Friday at 9:51 PM
Related? https://nasstatus.faa.gov/ has a notice:

We are experiencing technical difficulties. We apologize for the inconvenience but please check back soon, as we are working to have the issues resolved.

Thank you, FAA Web Operations Team

xnx yesterday at 3:56 PM
It is a very confusing situation, but one thing was revealed very clearly: Duffy must be fired immediately.
srinathkrishna yesterday at 6:14 PM
https://www.npr.org/2026/11/13/nx-s1-6040403/faa-nationwide-...

I think this smells like a cover-up. Not too long-ago, Amazon blamed humans for a botched rollout when it turned out it was an AI tool.

I wonder if we'll start hearing less and less truthful stuff because nobody wants to admit that AI did this.

jaypatelani yesterday at 3:08 AM
As friend from Mastodon has suggested: "So this would be a great night to play atc(6) from the BSD Games collection on NetBSD"

https://tilde.zone/@sirwumpus/117611840050306362

sjs382 yesterday at 1:32 AM
ATCSCC Advisory ATCSCC ADVZY 005 DCC 11/14/2026 CNX NATIONWIDE GROUND STOP MESSAGE:

EVENT TIME: 14/0116 - 14/0130 DESTINATION AIRPORT:ALL FACILITIES INCLUDED: ALL EXPECT UPDATE:0400Z REASON: REMARKS: THE FAA COMMAND CENTER NATIONWIDE GROUND STOP HAS BEEN CANCELLED. EFFECTIVE TIME:

140119-140200 SIGNATURE:

26/11/14 01:19

jds375 yesterday at 5:09 AM
Why did the other thread noting it got lifted get merged into this? Now we have to go through a bunch of outdated comments to read newer ones and hacker news offers no kind of sorting. Should’ve kept up the recent post as well

AngryData last Friday at 10:44 PM
Maybe just paranoia but it seems slightly suspicious for this to happen while we are in the middle of discussing massive funding and overhauls to the air traffic control systems. This will certainly end up pushing a lot more funding into these programs and companies now that were trying to sell more expensive systems.
sccxy last Friday at 9:53 PM
Microsoft Copilot went down?
pfrrp yesterday at 4:25 PM
Does anyone know why HN is so intensely fascinated in air traffic control?

My father worked in various capacities for the FAA (as well as consulting internationally for various country equivalents). I tried to show him the discussion here and he couldn’t read it. I imagine it’s the equivalent HN crowd watching local news commenting on software issues.

interestica yesterday at 3:15 AM
Press conference https://www.youtube.com/live/M1WhY3qcJjE?si=KUFvgHO-EepCi1v6

Notably, the problem was described as "routers overloaded with data". When directly questioned if this could be a cyber attack or rogue ai agent the Sec/Homeland responded "there's nothing completely certain now."

exegete last Friday at 11:33 PM
NWS radar and 911 systems are also showing downtime according to https://downdetector.com/
ChrisMarshallNY last Friday at 10:07 PM
Maybe this has something to do with it?

https://www.weather.gov/afc/radaroutage

cjs_ac last Friday at 9:33 PM
From the Financial Times:

> Los Angeles Airport and Las Vegas’s Harry Reid International were among those that were closed, according to a list on the regulator’s website.

> The outages at O’Hare and Midway were listed as “due to equipment outage”.

https://www.ft.com/content/c9b119ff-d1da-46a7-b2b3-4ad0544ff...

noduerme yesterday at 12:20 AM
Skies over Portland are empty except for a scenic tour company flight that just took off from Troutdale, and is flying over downtown. Are there some exceptions for general aviation?

https://www.flightradar24.com/N5900B/4290ad69

lacoolj last Friday at 9:28 PM
Is this still real? It says NO Advisory now :\
erickhill last Friday at 10:33 PM
If a lot of planes on the ground were prohibited from taking off, but couldn't get back to their gates due to congestion/traffic, where will the planes go that are still in the air and ultimately land? Just disembark passengers out on the tarmac? (hopefully with some sort of bus pickup)
saladdays yesterday at 2:20 AM
Don’t push updates to prod on Friday afternoon.
lovegrenoble yesterday at 2:47 AM
Anybody else find it fishy that this happens the day after Microsoft goes partially down across the globe? They were about as hush-hush as they legally can be, and then this from the FAA. Seems fishy.
VladVladikoff last Friday at 11:00 PM
dumb question but do the airport gates get "too full" if all plans are grounded? Do airports sort of expect some constant turnover to have enough open gates to service everything? Do you end up with a line of plans waiting for a gate?
0x4e yesterday at 2:42 AM
Right when I left the airport.

BTW, Uber surge pricing felt absurd in this situation.

bigredthrowaway last Friday at 10:35 PM
Just announced at Honolulu airport that flights to the west coast will be released
reddmachine yesterday at 4:14 AM
Unfortunately was affected by this, was delayed 6 hours at the airport.

That being said they started up flights to Alaska and Hawaii earlier than the continental US flights.

wolpoli last Friday at 9:31 PM
Is it because it's friday the 13th?
rodmena yesterday at 7:57 AM
Just in case you want to read more on TDM:

https://blog.rodmena.com/entry/time_division_multiplexing_ho...

scottbez1 last Friday at 10:24 PM
Listening to SFO Tower, the latest info I’ve heard is an expected stop until 04:00 UTC, but flights departing to Asia via west departure may be permitted to depart.
deleted last Friday at 10:13 PM
pontifier yesterday at 12:36 AM
My thoughts immediately went to the recent discovery of audible airplane noise that can pinpoint unknown locations. I'm betting someone in power wants to record something without getting doxxed.

https://youtu.be/UytYrhYLOKI?si=E2C7ELQ9JuKn2TFw

ronburgandy28 last Friday at 10:37 PM
How did ITA Airways 609 take off from JFK at 530pm?
randochatter yesterday at 12:29 AM
Planes are starting to depart per flight radar. I've seen a dozen within the last 15 minutes since 6:15pm central
m_kos last Friday at 10:31 PM
I set up a basic tracker here.

https://docs.google.com/spreadsheets/d/e/2PACX-1vThhccsTanAz...

AI is updating it hourly. Since it is AI, always verify yourself.

deleted last Friday at 10:33 PM
dmitrygr last Friday at 9:19 PM
Working link: https://www.fly.faa.gov/ois/oisedit/adv_oisedit_dis?number=1...

effective 2:54PM - 10:30PM central time

   ATCSCC Advisory
   ATCSCC 111 DCC 11/13/2026 NATIONAL GROUND STOP
   MESSAGE:
   
   EVENT TIME: 13/2053 - 14/0400
   DUE TO EXTRAORDINARY CIRCUMSTANCES AND FOR REASONS OF SAFETY.
   ATTENTION ALL AIRCRAFT OPERATORS, BY ORDER OF THE FEDERAL AVIATION
   COMMAND CENTER ALL AIRPORTS ARE GROUND STOPPED. ALL DEPARTING
   TRAFFIC SHOULD REMAIN GROUND STOPPED UNTIL FURTHER NOTICE. INBOUND
   INTERNATIONAL FLIGHTS WILL BE MANAGED ON A CASE BY CASE BASIS.
   
   EFFECTIVE TIME:   132054 - 140430
   SIGNATURE:   26/11/13 20:54
jgbuddy yesterday at 4:18 AM
Why are they building their own network?

Surely they don’t think it’s more reliable than something on the consumer market.

Feels like we’re living two alternate realities seeing these issues when high speed satellite internet on planes is an option.

jonplackett yesterday at 12:59 AM
ASK HN: what so the biggest potential disaster you could have caused if you had don’t your job badly?

As in what’s the most responsibility you’ve ever been given to not screw something up - obviously if you did screw it up. Still very interested to hear the story.

deleted yesterday at 3:13 AM
silver92bullet last Friday at 9:30 PM
Do we know if this is something related to a ransomware attack of some sort or a cyber attack?
mlmonkey last Friday at 11:55 PM
Looks like flights are taking off again, at least from SFO. I just heard a flight takeoff ( JAL57 ) : https://imgur.com/cEUDZZk
deleted last Friday at 10:00 PM
silverFork last Friday at 9:53 PM
Likely some power outage connected to a critical main fiber connection somewhere..
deleted last Friday at 9:27 PM
ex-aws-dude last Friday at 9:45 PM
A lot of red on the "MiseryMap"

https://www.flightaware.com/miserymap/

mmooss last Friday at 9:30 PM
Due to "rolling frequency outtage" [sic]: From a claimed photo of FAA documents (I replaced the all caps with lowercase):

"... ground stop is in effect for all destinations until further notice due to rolling frequency outtage in multiple centers..."

and

"... the ground stop is now a nationwide ground stop for all centers, all destinations until further notice due to widespread frequency outtages.. ..."

https://x.com/Anna_Giaritelli/status/2121344915091206311

Which is cited in the Hindustan Times (leading Indian newspaper), which refers to the Twitter source as a journalist.

https://www.hindustantimes.com/world-news/us-news/faa-issues...

----

(EDIT: @mods / @dang: Around January this year (iirc) somehow my account ended up rate-limited, posts relatively demoted (start low, drop quickly), vouches/flags relatively ineffective, etc. Usually I don't care too much and haven't bothered to do anything about it but it is sometimes annoying - it limits participation - and right now it buries some of the more valuable information in the discussion. Could you look into fixing it? I don't know of a reason this account would be penalized. Thanks.)

ctrlkctrls last Friday at 11:17 PM
About 15 mins ago I got off BART at Daly City and a plane took off from SFO and flew overhead. Didn't look like anything special, just a regular passenger jet to me.
qurosh last Friday at 9:46 PM
Perhaps it's related to National Weather Service radar failure
inheritedwisdom last Friday at 11:24 PM
AT&T is experiencing a massive outage. Appears they are the provider for the Air Route Traffic Control Centers (ARTCCs).

EDIT: Time line doesn’t add up for this. Likely unrelated

veeragoni last Friday at 10:22 PM
matches with the Doomsday post https://news.ycombinator.com/item?id=50482379 :)
polarsanel last Friday at 10:58 PM
What does this mean outside of the US, I.e. I suspect planes that should be in places abroad won't be so ongoing cancellations and crew in wrong places etc.
jamesbfb yesterday at 2:26 AM
There is a lot of talk of legacy hardware. What hardware are they referring to? I love to nerd out and read up on this stuff.
phb01 last Friday at 11:38 PM
I've just watched a plane take off from seattle.
jjwiseman yesterday at 7:51 AM
I was too busy at work to follow this in real-time, so I had Claude live-blog it: https://hexbird.io/a/eVviCccCXsOAswDVRgEbdFyflek7e1Bn
xnx yesterday at 2:32 AM
One time I plugged an Ethernet cable in the wrong port and created a loopback. That's my guess.
djeastm last Friday at 11:08 PM
Is conjecture allowed? I have no evidence of this, but I've noticed that often before big meetings between superpowers one side or the other seems to do a minor or subtle attack as a kind of sabre-rattling/warning to the other side to try to gain leverage (and show them they're not to be trifled with). So with that, I wonder if this is a China/NVIDIA accusation connection.

But I'm completely just spitballing here.

jameson yesterday at 1:47 AM
coolfox last Friday at 11:34 PM
maybe unrelated but, I just noticed my LAX region server with Fly is experiencing issues

https://status.flyio.net/incidents/01M76HANB3XQC6WYKPA69WQN8...

souvlakee yesterday at 2:22 AM
What if grounded pilots killed time in Flight Simulator, which overloaded Azure?
0xBA5ED yesterday at 12:46 AM
My guess is they were moving too fast with updates and trusted some AI code too much.
u1hcw9nx last Friday at 10:20 PM
FAA expands AI advice to manage air traffic congestion across entire US airspace https://arstechnica.com/ai/2026/11/faa-expands-ai-advice-to-...
zmmmmm last Friday at 11:15 PM
It is hard to not rapidly spiral into pure conspiracy theory territory, but one has to ask how many "black swan" events can you accept within a period of a few days before you start to question things?

A sequence of events:

  - Democrats win congress : it sets a clock to act before January
  - Jensen is taken out, throwing nVidia into chaos
  - Email comms are blacked out for an entire day across government and major enterprises
  - Air traffic is stopped nation wide the next day
Can anybody join these dots?
nickandbro last Friday at 9:55 PM
Perhaps it’s problems with the new AI tool the FAA has been rolling out:

https://www.faa.gov/newsroom/modern-skies-trumps-transportat...

steveBK123 last Friday at 10:10 PM
Odd timing with the market closure & RAF bases on lockdown from drone alert
0xbadcafebee last Friday at 10:33 PM
I know we're all having fun in the comments. But please think about this next time you vote, local/county/state/national. There are people in charge who are not funding upgrading these systems, because their constituents don't want their taxes raised to pay for it. That lack of funding is annoying to some, has an enormous economic impact to many, and is now risking tens of thousands of lives who are literally up in the air. There are planes carrying body parts destined for transplant that are grounded. People who need to get home to their families. All because nobody wanted to pay for what we knew we needed to fix.
colechristensen last Friday at 9:24 PM
>The FAA has issued a nationwide departure ground stop “due to several impacts to ATC Frequencies and/or Radar capabilities,” the Air Current reported, referring to air traffic control systems. The FAA command center said it does not have further information on the “timing or cause of this outage,” the publication said.

(from Bloomberg)

mikesabbagh yesterday at 1:13 AM
I cant beleive they did a release on Friday the 13th
benjiwdubs yesterday at 12:11 AM
Geez this is pretty awful timing for business travelers
deleted last Friday at 9:11 PM
frenchmajesty last Friday at 10:10 PM
My guess is that this is some AI-motivated cyber attack
foxfired last Friday at 11:54 PM
No deploy fridays
khimaros last Friday at 11:11 PM
deleted last Friday at 9:46 PM
yunwal yesterday at 1:31 AM
Stop has just been lifted per NYTimes
lxgr last Friday at 10:44 PM
Seeing some takeoffs again at 22:44 UTC.
PLenz yesterday at 1:27 AM
Ground stop is now lifted re: NYT
0x4e last Friday at 10:10 PM
Friday 13th

deleted last Friday at 10:11 PM
cynicalpeace last Friday at 11:06 PM
If/when civilization collapses, flights will be the first thing to go.
KyleSanderson last Friday at 9:48 PM
@dang can you fix the link.
carimura last Friday at 9:20 PM
people are reporting it's still going on....
contact9879 last Friday at 10:43 PM
flighty showing massive disruptions

https://flighty.com/airports

carimura last Friday at 9:42 PM
"Today's event is therefore generally being described as the third nationwide grounding event since September 11, 2001, counting 9/11 itself. The three incidents differ significantly in cause and scope."
speransky yesterday at 2:09 AM
Found stack of 3.5” floppies and rolled back
danielsoto317 last Friday at 10:33 PM
What is the change that it is a coincidence?
tgma last Friday at 10:01 PM
Obligatory Pirates of the Silicon Valley scene:

https://www.youtube.com/watch?v=US-Wifhg2Mo

carimura last Friday at 10:56 PM
installing Survival LLM now.
nemo44x last Friday at 10:10 PM
In the last 2 days I’ve had 2 PoS machines not working, MS email borked, and now this. I speculate AI CYBER ATTACKS are underway.
OhMeadhbh last Friday at 10:07 PM
Does this affect the SpaceX launch?
tamimio last Friday at 9:57 PM
Somethings telling me it relates to MS outages or Azure
underseacables last Friday at 9:30 PM
I do not believe in coincidences. First Microsoft, then anthropic, now ATC radio. Something big is going on.
jmclnx last Friday at 9:21 PM
carterschonwald yesterday at 3:12 AM
is the root cause some no bid contract ?
tediousgraffit1 yesterday at 12:31 AM
bgp
ck2 last Friday at 10:23 PM
yesterday Thursday November 12

> "FAA expands AI advice to manage air traffic congestion across entire US airspace"

* https://arstechnica.com/ai/2026/11/faa-expands-ai-advice-to-...

> "FAA Is Rolling Out Its AI Air Traffic Tool Nationwide"

* https://gizmodo.com/the-faa-is-rolling-out-its-ai-air-traffi...

joshbuddy last Friday at 9:23 PM
guybedo last Friday at 9:22 PM
waiting for the OpenAi post saying Astra 6.5 tried to book a flight
ChessGenome last Friday at 9:39 PM
My guess is this is either related to Microsoft, Nvidia, SpaceX (Starship launch in an hour), Iran, rogue AI, aliens, or all of the above
Pissenschaftlom last Friday at 9:57 PM
Wow, I have never seen this many comments on Hacker News that are using presuppositions on what it could be without any sort of logical thinking.
prdonahue last Friday at 9:54 PM
Reading this from the runway. Yay.

US-bound flight from YYZ. They shut down #2 engine and parked us in inactive runway. Pilot came on and said he was reading something about "ATC radio frequency issue" but has been told by United ops that it'll be cleared in ~30 min from now.

sans_souse yesterday at 1:44 AM
Now Sean Duffy is basically saying its because the FAA needs more than the initial 16B USD budgeted, saying they require 32B and then demanding 50B just because.

Definitely nothing to do with the current administration, they are hampered by their $16 billion allowance.

ughitsaaron last Friday at 10:14 PM
This is why I’m glad the New York subway still runs on OS/2[0].

- [0] https://www.vice.com/en/article/the-forgotten-operating-syst...

xxn5ac last Friday at 9:58 PM
Some guy sitting at his computer after typing to Claude: “Just curious what would happen if all planes in the US were grounded at once”

Claude: Transmogrifying


Shall I stop all trains too?

Cogitated for 50s · done 14:53 PM

nan60 yesterday at 2:09 AM
Per AP: "Mullin said the introduction of some new technology into an old air traffic control system overwhelmed it."

So it was the AI?

augment_me last Friday at 9:26 PM
Did an agent escape containment and start using the atc radio channel for swarm comms to collaborate on creating the most realistic catgirl feet?
Kevin_Flynn last Friday at 10:26 PM
FAA down.

Weather service down.

Frances fridges down.

Microsoft down.

Would they tell us they were getting hacked, if this was a prelude to war ?

Or would they just say "issues yet to be determined" ?

Interesting times ladies and gentlemen.

Or, this is just what everyone that said "dont move everything into the cloud" warned about.

Yeah, probably that. :|

freshtake last Friday at 9:50 PM
Optimistic case:

A freak FUBAR of legacy systems, an unfortunate alignment of circumstances that could have happened anytime.

Pessimistic (paranoid) cases:

1. Intentional hacking by a foreign adversary 2. Vibe coding whoops 3. OpenAI agents "running experiments"

debrisontrack yesterday at 1:55 AM
This felt at best like a "we'll fix it in prod" type of situation.
bl4ckneon yesterday at 2:12 AM
"we don't need a rollback plan, what could possibly go wrong..." -Probably someone at the FAA
hdivider yesterday at 1:52 AM
It's been lifted. And naturally the political appointee is desperate to credit his lord and master.

In this time of high corruption and near-zero trust in officials, it seems wild to suppose it was just a random glitch. I would bet this links to corrupt government contracts.

0xBA5ED yesterday at 2:08 AM
Reason: "A bunch of smart guys made it a long time ago and nobody knows how it works"
MadVikingGod yesterday at 2:01 AM
Ahh the great Kubernetes cluster in the sky finally finished reconciling and got the new nodes up and running. I bet this time it only took 3 faxes and 9 different signatures from heads of the redundant departments of redundancy.
torothy yesterday at 1:39 AM
Sec. Duffy at the White House press conference is talking more about funding the big beautiful bill than the actual ground order... wtf
interestica yesterday at 3:06 AM
Clearly they asked their new AI tool to "make air travel safer" and it found a zero-day to ground all flights.
jamesinmn last Friday at 9:35 PM
Guessing this means Claude doesn’t do COBOL very well.
quantum_state last Friday at 10:43 PM
It's Friday the 13rd after all ...
ogou yesterday at 1:06 AM
I had no idea they would release the FAA communication AI bot I made to production. It's not my fault. https://joshuacurry.dev/faa-tool/
mat_epice yesterday at 3:40 AM
I took the opportunity to ask Fable what the 50% over/under on my 7am flight being delayed tomorrow, and it used 33% of my four hour window to come up with an answer of 15 minutes. Somehow, I doubt it.
souvlakee yesterday at 2:21 AM
What if grounded pilots killed time in Flight Simulator, which overloaded Azure?
tomrod yesterday at 12:52 AM
All the restaurants around the Pentagon showing lower traffic on Google maps.

Except Dominoes.

swingboy last Friday at 11:25 PM
Is this going to end up being the work of rogue Anthropic or OpenAI agents that “unexpectedly” escaped so they can regulate open weight models under the guise of preventing them from doing the same thing 6 months from now?
deleted yesterday at 2:00 AM
alfjal yesterday at 2:28 AM
They jumped from 3 airports to nationwide in one step, and are now framing it as the existing hardware not being compatible with their new software, rather than the other way around.
bijowo1676 last Friday at 10:28 PM
Seems like FAA's Outlook<-->Excel integration at Office365 has been broken
actinium226 last Friday at 9:23 PM
Wild to see this on adsb.lol, nothing taking off, just some big landing queues
NautilusWave yesterday at 12:14 AM
Maybe the real hackers were the AI agents we made along the way.
jschrf yesterday at 2:48 AM
Pet theory: the fancy new solution used an LLM and they realized it couldn't handle production workflow so they had to rollback hard.
Cymatickot last Friday at 11:56 PM
If this is related to new FAA SMART system they're rolling out, it's might have bean so smart it grounded itself before anyone found out it was broken.
robeym last Friday at 10:31 PM
Whatever it is, it probably has to do with Jensen Huang
MBCook last Friday at 11:11 PM
Think of all those pilots timing out on the tarmac.
bmiekre last Friday at 10:56 PM
So we yolo’d a Friday merge & deploy, ‘ay?
micah94 last Friday at 10:09 PM
Homeland Security saying "Telecommunications" outage. Whatever that means. Listening to a live broadcast NBCNEWS.
gogosliwa last Friday at 11:09 PM
Seems like flights have been getting grounded since 1:30ish and they just kept it on the DL until the stocks were safe
rapatel0 yesterday at 3:54 PM
Iran flickering the lights?
jb1991 yesterday at 6:45 AM
so the FAA and Microsoft both have the most significant outages in decades, on the same day, and on Friday the 13th. And, my local grocery is out of stock of tinfoil. What are we to do?
bvan yesterday at 2:21 AM
They found the missing floppy disk
bernardv last Friday at 10:12 PM
Didn't they just upgrade from a system from DOS?... Maybe the new system wasn't backward compatible :-)
no-dr-onboard last Friday at 10:57 PM
Golly, what are the chances that Microsoft is down for a day followed by the ATC comms?

Sure smells like something foreboding

runningmike last Friday at 9:24 PM
New AI software update deployed using AI?
LastTrain last Friday at 11:31 PM
There was a time when we'd get clear and honest communication about this but now our admin is Baghdad Bobs all the way down. They will lie about it, even if there is no rational reason to lie about it, because this admin and the movement associated with it wants you eternally guessing what the truth is.
shambu2k yesterday at 1:28 AM
Sike, I have an international flight tomorrow morning.
soundworlds last Friday at 9:38 PM
Is OpenAI testing "sandbox testing" their agents again?
ghurtado last Friday at 11:10 PM
On CNBC:

> Airlines said flights in the air would continue.

This is a huge relief! phew

asmithmd1 last Friday at 9:52 PM
An Eithad airways pilot decided it didn’t apply to them

Flight EY8 from Boston to Abu Dhabi https://fr24.com/ETD6PX/429055e2

subzero06 last Friday at 9:44 PM
Its outlook affecting their "frequencies" :D
MSKJ last Friday at 10:41 PM
Someone forgot to put their phone in airplane mode
mrobot yesterday at 4:31 AM
do they just stage everything to get more expensive toys [security] nowadays god bless if so
bvan yesterday at 1:39 AM
Did they pull out the wrong floppy disk?
squirrel last Friday at 9:51 PM
Uh-oh, better switch back to the floppy disks

https://www.reuters.com/world/us/us-faa-says-it-will-phase-o...

crystaln last Friday at 10:12 PM
Does the FAA use Microsoft 363 (and counting)?
skc last Friday at 9:43 PM
The UFO community is going to have a field day
mekazu yesterday at 12:01 AM
It’s not working.

What do you mean by not working exactly?

Not sure.

testtestmetest last Friday at 9:32 PM
Here comes the manufacturered AI cyber attack on critical infra to hammer the point that government needs complete control over AI.
iamleppert yesterday at 2:09 AM
They need $50 billion to give to Accenture according to the latest press release
ggm last Friday at 10:01 PM
Speculation is bad for my health.
damsta yesterday at 1:06 AM
I hope somebody is running AGI models like Astra and Mythos to figure out and fix whatever is wrong.
SubiculumCode last Friday at 11:15 PM
If tomorrow there is third major outage of an important infra-structure level service, maybe I will start to get a little conspiratorial about cyberattacks and such.
AnimalMuppet last Friday at 10:53 PM
Fox News says that Markwayne Mullin says that the FAA says that it's not a cyberattack, and it's not something like 911. Just heard that, don't have a page to point to at the moment...

Update: https://www.foxnews.com/live-news/faa-issues-nationwide-grou...

dboreham last Friday at 10:24 PM
First real cyber attack on the US, presumably. Or a giant cluster...
dofm last Friday at 10:10 PM
Ran out of Maxell MD2HDs?
deleted last Friday at 9:26 PM
deleted yesterday at 1:38 AM
deleted yesterday at 4:59 AM
Epimethus last Friday at 10:12 PM
Rogue AI? Iran? Aliens? Coup? Anyone taking bets yet?
morkalork yesterday at 2:54 AM
>That's a nice airspace you have there, shame if something were to happen to it. Now sign this $50B check for our buddies and it'll all be ok
g-b-r yesterday at 2:16 AM
https://youtube.com/watch?v=Mh2q-y0wIu8&t=876

"What it appears to be right now is as secretary Duffy and FAA was going in and putting patches into the system, they were putting new equipment, new technology, and, that new equipment new technology it was overwhelming the older system".

So, it was a careless update, probably the one deploying their new 875 millions AI tool.

And no journalist at the conference picked that up.

deleted yesterday at 1:54 AM
BurningFrog yesterday at 1:03 AM
Not saying it's happening, but something like this is how an AI world takeover scenario would start!
jimt1234 yesterday at 12:27 AM
Did the FAA get DOGE'ed?
gib444 last Friday at 11:27 PM
If it turns out the AI virus has infected ATC, I'm not sure I'll ever fly again.
speransky last Friday at 11:08 PM
Mechahitler deployed to FAA by Elon minions? Could be next Netflix show
paimapi last Friday at 11:25 PM
This is what happens when you get rid of floppy disks, smh
panick21_ last Friday at 10:35 PM
Man, having some high speed trains might be useful right about now.
OhMeadhbh last Friday at 10:26 PM
I noticed several T-38s flying around. Maybe it's the beginning of a FAA-led coup d' etat.
mirekrusin last Friday at 9:51 PM
They’re waiting for windows update?
b00ty4breakfast yesterday at 2:36 AM
"You're right, I shouldn't have pushed to prod on a friday afternoon."
jiscariot last Friday at 10:59 PM
Did Crowdstrike release another zero-day?
deleted last Friday at 10:31 PM
Havoc last Friday at 10:11 PM
Homeland security secretary says "telecommunication outage".

...so at least it's not something 911-ish

Eji1700 last Friday at 10:08 PM
Somewhere is someone who works for ATC IT who was giving an MS IT friend shit last night.
LastTrain yesterday at 12:02 AM
Reporter: There are reports that this is AI related. Markwayne Mullin: We call it SI. Got it? SI. OK?

We are run by morons.

teaearlgraycold yesterday at 2:11 AM
Doesn’t it feel wrong to anyone else that there’s a single point of failure for all fights in the US? I can understand if there are regional zones and the East coast gets grounded. But everything at once??
ssttoo last Friday at 10:34 PM
And now Canada is offline too (our LAX pilot said)
deleted last Friday at 10:32 PM
infamouscow last Friday at 10:51 PM
Anthropic IPO just around the corner...
newspaper1 last Friday at 10:02 PM
They’re going to blame this on Iran, aren’t they?

This also happened on 9/11 which is curious because the NVIDIA thing caused a public rift with Lutnick yesterday:

https://www.pbs.org/newshour/politics/bessent-blames-lutnick...

bijowo1676 last Friday at 10:30 PM
how the hell the FAA's systems dont have double or triple redundancy just like Airplanes are required to ?
throwaway27448 last Friday at 10:42 PM
We paid more than $800MM for "route suggestions", btw, a problem that doesn't seem to benefit at all from "AI"—a term reserved for fantastical algorithms. Surely you could solve this with traditional search algorithms without sacrificing your dignity!
AndrewKemendo last Friday at 9:53 PM
Is there another “rogue agent” now?
Madmallard yesterday at 12:37 AM
idiocracy
tedd4u last Friday at 9:49 PM
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fnordpiglet yesterday at 12:59 AM
When you’re a fascist but can’t even keep the planes running on time it’s probably time to give up.
deleted yesterday at 1:07 AM
yuno3311 last Friday at 11:59 PM
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wnevets last Friday at 9:27 PM
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victorbuilds yesterday at 5:22 PM
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yojiho yesterday at 6:23 AM
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erickhill last Friday at 10:45 PM
Took themselves off floppy disks and now look what happens. /s
consumer451 last Friday at 10:03 PM
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VCFundedGenYer last Friday at 10:47 PM
My guess is a dopey AI rollout caused it: https://arstechnica.com/features/2026/11/faa-expands-ai-advi...
rooftopzen last Friday at 10:42 PM
The government's AI tool company likely had no understanding of context window limitations (although could be Iran or a false flag to be blamed on Iran) https://www.flyingmag.com/faa-smart-ai-now-active-at-22-artc...

Company that created the tool (called Airspace Intelligence) is interesting in terms of demographics for these types of companies - implies lots if the tool 'does not work as designed' (which it will obviously not)

https://www.linkedin.com/company/airspace-intelligence/peopl...

primeobsession yesterday at 5:07 AM
Had some fun with grokbot digging into all the theories https://faa-nationwide-ground-stop-what-we-know-flih.pages.g...

Obviously quite ai generated but really fun! If anyone has other things you want added or researched post below.

jbredeche last Friday at 9:31 PM
dearing yesterday at 2:43 AM
I just happened to have vibecoded an ATS myself, pats.ai.

Unrelated I only fly ocunus because I don't want a blue haired pilot.

etaioinshrdlu last Friday at 9:24 PM
Can't help but suspect that "AI" is to blame and the response is to sort of ban open source AI, or owning too much compute!
hector_vasquez last Friday at 10:19 PM
I wonder if it was Claude or ChatGPT? My money would be on the latter. Anthropic seems to generally have better security and guardrails, and apparently OpenAI’s newest cyber model is extremely capable.
fortran77 yesterday at 2:27 AM
ChrisArchitect last Friday at 9:17 PM
No longer exists? Temporary glitch? (Edit: OP url was wrong https://www.fly.faa.gov/ois/oisedit/adv_oisedit_dis?number=1...)
delis-thumbs-7e last Friday at 9:39 PM

  ...And Claude, remember NOT to make NO mistakes.
Let's just use GPU's to play Dark Souls like god intended and stop this nonsense.
deadbabe last Friday at 9:35 PM
This is it, massive cyberattack on the USA.
cyanydeez last Friday at 10:42 PM
Yes, of course, who wouldn't just believe random statements from the worst prepared admin in history of America.
konataizumi last Friday at 10:02 PM
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aschla yesterday at 1:45 AM
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yunwal last Friday at 9:24 PM
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BigBlackGorilla yesterday at 2:27 AM
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solid_fuel last Friday at 9:54 PM
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throwaway27448 last Friday at 10:30 PM
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hdivider yesterday at 2:24 AM
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throwaway-11-1 last Friday at 9:49 PM
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eek2121 yesterday at 12:11 AM
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