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Marko – A declarative, HTML‑based language

https://markojs.com/
143•ulrischa•4h ago•55 comments

WriterdeckOS

https://writerdeckos.com
76•surprisetalk•4h ago•42 comments

Study identifies weaknesses in how AI systems are evaluated

https://www.oii.ox.ac.uk/news-events/study-identifies-weaknesses-in-how-ai-systems-are-evaluated/
259•pseudolus•8h ago•144 comments

Largest Cargo Sailboat Completes Historic First Atlantic Crossing

https://www.marineinsight.com/shipping-news/worlds-largest-cargo-sailboat-completes-historic-firs...
31•defrost•2h ago•9 comments

Control structures in programming languages: from goto to algebraic effects

http://xavierleroy.org/control-structures/
41•SchwKatze•5d ago•1 comments

Avería: The Average Font (2011)

http://iotic.com/averia/
66•JoshTriplett•3h ago•15 comments

Cloudflare scrubs Aisuru botnet from top domains list

https://krebsonsecurity.com/2025/11/cloudflare-scrubs-aisuru-botnet-from-top-domains-list/
100•jtbayly•6h ago•24 comments

What Hallucinogens Will Make You See

https://nautil.us/what-hallucinogens-will-make-you-see-308247/
6•simonebrunozzi•1h ago•3 comments

My first fifteen compilers (2019)

https://blog.sigplan.org/2019/07/09/my-first-fifteen-compilers/
28•azhenley•1w ago•1 comments

An Algebraic Language for the Manipulation of Symbolic Expressions (1958) [pdf]

https://softwarepreservation.computerhistory.org/LISP/MIT/AIM-001.pdf
69•swatson741•7h ago•9 comments

Syntax and Semantics of Programming Languages

https://homepage.cs.uiowa.edu/~slonnegr/plf/Book/
51•nill0•1w ago•2 comments

Ticker: Don't die of heart disease

https://myticker.com/
302•colelyman•7h ago•276 comments

Valdi – A cross-platform UI framework that delivers native performance

https://github.com/Snapchat/Valdi
449•yehiaabdelm•22h ago•181 comments

Why is Zig so cool?

https://nilostolte.github.io/tech/articles/ZigCool.html
473•vitalnodo•23h ago•413 comments

I Want You to Understand Chicago

https://aphyr.com/posts/397-i-want-you-to-understand-chicago
305•tonyg•3h ago•115 comments

Transparent computer monitor designed to protect your vision

https://www.visualinstruments.co/phantom/display
34•plun9•3h ago•42 comments

52 Year old data tape could contain Unix history

https://www.theregister.com/2025/11/07/unix_fourth_edition_tape_rediscovered/
131•rbanffy•6h ago•44 comments

How to declutter, quiet down, and take the AI out of Windows 11 25H2

https://arstechnica.com/gadgets/2025/11/what-i-do-to-clean-up-a-clean-install-of-windows-11-23h2-...
11•mariuz•1h ago•5 comments

Open-source communications by bouncing signals off the Moon

https://open.space/
9•fortran77•6d ago•2 comments

Making Democracy Work: Fixing and Simplifying Egalitarian Paxos

https://arxiv.org/abs/2511.02743
143•otrack•15h ago•42 comments

Myna: Monospace typeface designed for symbol-heavy programming languages

https://github.com/sayyadirfanali/Myna
363•birdculture•1d ago•166 comments

Computational Complexity of Air Travel Planning (2003) [pdf]

http://www.ai.mit.edu/courses/6.034f/psets/ps1/airtravel.pdf
56•arnon•4d ago•5 comments

I taught an octopus piano (It took 6 months) [video]

https://www.youtube.com/watch?v=PcWnQ7fYzwI
21•weinzierl•1h ago•4 comments

The modern homes hidden inside ancient ruins

https://www.ft.com/content/5f722a2e-71d8-430c-a476-95de2c4ad9a5
49•Stratoscope•6d ago•4 comments

How did I get here?

https://how-did-i-get-here.net/
311•zachlatta•1d ago•56 comments

Cekura (YC F24) Is Hiring

1•atarus•10h ago

Immutable Software Deploys Using ZFS Jails on FreeBSD

https://conradresearch.com/articles/immutable-software-deploy-zfs-jails
159•vermaden•22h ago•43 comments

Near mid-air collision at LAX between American Airlines and ITA [video]

https://www.youtube.com/watch?v=-j76cp7bETw
92•goblin89•3h ago•60 comments

Why I love OCaml (2023)

https://mccd.space/posts/ocaml-the-worlds-best/
379•art-w•1d ago•268 comments

Friendly attributes pattern in Ruby

https://brunosutic.com/blog/ruby-friendly-attributes-pattern
90•brunosutic•6d ago•65 comments
Open in hackernews

Near mid-air collision at LAX between American Airlines and ITA [video]

https://www.youtube.com/watch?v=-j76cp7bETw
91•goblin89•3h ago

Comments

bonsai_spool•2h ago
This happened on 10/31/25 https://avherald.com/h?article=52f72b6c&opt=0
dehrmann•2h ago
Is this interpretation right? There are parallel runways, and the plane departing on the runway on the right turned left, into the path of the plane departing parallel on the left?
SilverElfin•2h ago
Yes exactly. They were within 1000 yards of each other and less than 5 seconds from colliding according to some videos analyzing the GPS data. If you listen to the ATC chat, the American Airlines pilot noticed the other plane going the wrong way himself and made a proactive change to avoid collision without waiting for ATC. Although the traffic controllers did notice and quickly gave out new directions, it may have been too late if the pilot didn’t act.
goblin89•1h ago
Edit: I listened to it again and they were handed off to departures before tower’s traffic warning. The near-collision occurred during tower-departures handoff. Tower was warning them of traffic in hopes they were still listening but they probably weren’t, and they noticed traffic just before they contacted departures.

On ATC side, I suppose departures could have been more proactive and warn AA of traffic together with tower. On pilot side, I suppose AA could have been listening to tower for a while as they are tuning in to departures (there were 10–20 seconds where AA was not listening to tower anymore and did not come in on departures yet).

Original comment as is:

If the video is to be believed, the tower did tell American right away (at 1:36 in the video, way before any visible corrections by either plane were made) that there is traffic and to stop the climb. It’s unclear whether American paid attention to tower, because seconds later they came in on another frequency saying they have traffic in sight. When asked afterwards whether tower gave them a heads-up they denied it.

Of course, ITA paid even less attention, considering how they were the original cause of this all and how for 30 seconds they ignored ATC’s request to turn right immediately (issued at about the same time that AA was warned about traffic).

This doesn’t contradict that what AA did was proactive and possibly life-saving, but I have a suspicion that the initial deviation by ITA could have been benign if both crews paid their full attention to comms: what if ITA started to turn 270 immediately as they are told to (while continuing to climb up from 1500), and American simply stopped their climb at 1500? I am not 100% confident.

That said, I would also agree ATC could have been more proactive, harder on ITA (instead of just telling them to turn again 30 seconds later). Presumably they are strapped for resources right now.

(There could be errors in the above in case the chart and different radio communication tracks in the video are out of sync with each other, which is possible.)

jvanderbot•1h ago
They said they had traffic in sight in response. As in "yes I see them". I believe their avoidance maneuver was a climb change.
goblin89•1h ago
If “in response” means replying back to tower on tower’s frequency, then no. After the lady on tower frequency told them about traffic (twice), they came in on departures frequency (it was a fresh contact, they started with “good afternoon, American 4 with you”) and said they have traffic in sight.

Edited after I rewatched the video:

1. Tower handed them off to departures.

2. They said bye and stopped listening to tower.

3. ITA veered left.

4. Tower noticed it and warned them, hoping they are still listening.

5. They were evidently not listening to tower anymore, and did not contact departures yet, when they noticed traffic themselves.

6. They greeted departures saying they see traffic, and veered left.

Later at 2:45 American said tower didn’t give them a heads-up. The fact that departures asked them about it could mean that departures thought they were still listening to tower.

Pretty sure the pilots have a second radio and could be listening to both departures and tower during handoff, but it’s unclear whether that’s routine. If they did it, they would have heard tower’s original warning.

> I believe their avoidance maneuver was a climb change.

According to the chart in the video, AA veered to the left. This maneuver started around 1:51 in the video, which is at least 10 seconds after tower warned them of traffic and instructed to stop the climb for the first time around 1:38.

I don’t know if they stopped the climb around 1:38. If we know for sure that they stopped the climb around 1:38 when tower told them so, then there is a good chance they were indeed still listening to tower and heard the traffic warning. If that’s the case, maybe they thought that stopping the climb 10 seconds earlier was insufficient (and tower was wrong about it).

gosub100•1h ago
One theory in the comments was that ITA loaded the wrong departure in their computer and just flew it without noticing that they were on the wrong side of the airport and/or ATC's prior instructions contradicted the electronic plan.
sdh9•55m ago
They had the correct SID, but the wrong runway.
IshKebab•1h ago
Kind of blows my mind how primitive this whole system still is. Audio quality is really bad. They're sending instructions by voice. The way they know who is speaking is by just saying their callsign with every message.

There's got to be a better solution surely?

SecretDreams•1h ago
What's the most reliable situation you can think of that will never fail and drive better audio quality?

This is a field where they need more .9999s than Amazon.

julianlam•1h ago
Unintelligible audio is a failure mode.
tekla•1h ago
Seems to work pretty well most of the time w/ souls involved. Works better than most websites on hard lines.
lysace•1h ago
The canonical counter-example against voice/audio:

https://www.youtube.com/watch?v=1NDqZy4deDI

JFK controller tries to communicate with Air China 981

tekla•1h ago
You mean a situation where a pilot who is supposed to know English in the parlance of global aviation lingo seems to be playing dumb?
lysace•1h ago
That is a unique thought.
tekla•1h ago
I'm assuming you don't listen to ATC traffic much, and have general HN assumption you just know better than everyone else.
lysace•1h ago
Maybe assume less.
ryandrake•1h ago
One of the YouTube commenters contributed some much-needed nuance. JFK Ground added to the confusion by repeatedly refusing to use standard phraseology, and failed to maintain professionalism, getting audibly angry and impatient. Both sides of the radio conversation had problems.
lysace•27m ago
Exactly, voice comms has a large number of disadvantages.
bigbuppo•51m ago
Amazon is up to, what, one and half nines right now?
hdgvhicv•13m ago
5 9s in 95.79999%
montecarl•1h ago
I think that the audio we are listening too is from some ground recording station that isn't necessarily near the airport. We aren't listening to a recording of what the pilots heard or what air traffic control hears.
lysace•1h ago
This is one of the highest quality recordings of such traffic that I have heard. They are usually a lot worse.
appreciatorBus•1h ago
Yup. Audio is sourced from volunteers with home radios & antennas. Quality will be dependant on how far the nearest one was from LAX and their personal setup. Not necessarily representative of quality that the controller/pilot was hearing.
aprentic•43m ago
https://www.liveatc.net/

If you want to listen in yourself.

proteal•1h ago
It has to do with how ATC needs to be able to communicate with all planes in the air, even ones built 100 years ago. They have to use radio so everyone can hear everyone else. There’s no other technology that is as ubiquitous as radio, so they have to work with what they’ve got. Upgrading to other stuff would be an absolute nightmare, though they are making progress on less critical fronts.
mmooss•1h ago
Couldn't comms broadcast in multiple parallel modes, like cell phone traffic?: More clear (probably digital) transmissions in on band, and for backward compatibility, old radio transmissions in another.
gosub100•1h ago
I think one of the best things they could add would be an electronic drawing tablet for ATC to draw a flight path on a map and pipe it directly into the pilots EFIS or HUD. It's not fool-proof, but in high density airspace, it seems more efficient to be able to draw a curve and press a button than try to verbally describe it. Of course one major pitfall is you cannot draw in 3D.
db48x•1h ago
That would be slower and ironically less precise than what we already have, which is navigation by named waypoints.
bigbuppo•51m ago
They already have something better than that. It's called a published departure procedure that pilots are supposed to follow. In this case, one of the pilots failed to follow the published departure procedure and came close to being on the next season of Mayday: Air Disaster.
12_throw_away•1h ago
Right? Just in a car, we know that talking to someone in the car itself has adverse effects on situational awareness, and talking to someone on a phone is much worse than that. But even after all the research and training that goes into human factors in aviation ... we can't do better than confusing, poor quality, AM band party lines during critical phases of flight?
tekla•1h ago
Would you rather them read text messages on their iPads?
12_throw_away•1h ago
Oh of course, those are the only two options: either an AM band party line or text messages on an iPad. Nothing else is possible.
tekla•1h ago
Open to suggestions. Keep in mind I've worked on Aircraft control systems and have a very strong opinion on reliability and crew management.

I also note that the budget isn't infinite nor do these aircraft like running electron apps.

Also note that not all (if not most) aircraft are not brand new and so would need all to be retrofitted and re-rerated w/ any new system and every single pilot retrained.

This requirement also includes systems for general aviation pilots and both to be able to sync with each other.

12_throw_away•59m ago
> Also note that not all (if not most) aircraft are not brand new and so would need all to be retrofitted and re-rerated w/ any new system and every single pilot retrained

Ah yes, I forgot, we never introduce new aircraft technology because it's too hard. Too bad we don't, it would be great to fit aircraft, with, say, anti-collision transponders and advanced ground proximity systems. Oh well, my mistake for even bringing it up.

anigbrowl•26m ago
Suggest a specific idea, instead of this theatrical sarcasm.
numpad0•19m ago
Is your problem a trust issue with always-updating AWS-hosted randomly-banned silently-breaking framework-rotating modern web apps, or something fundamental with GUI based systems?

I mean, I wouldn’t trust a literal iPad, but I’m not sure if I distrust an entirely figurative iPad.

db48x•1h ago
Keep in mind that the person talking and listening to the radio is not the pilot flying the airplane. Pilot and Copilot alternate which job they are doing. It's not the same as the driver of a car talking on a phone.
jvanderbot•31m ago
Talking to someone on the phone who has a birds eye view of the road, other drivers, and the map, and only addresses you to help you drive? in no way possible reduces your situational awareness. I refuse to believe that.

Now idle chatting with coworker Wendy about dinner will take you out of that situation and make you more dangerous.

jvanderbot•1h ago
I want you to very carefully consider the better options.

Perhaps they type instructions? And hope someone reads them?

Perhaps they drag and drop vectors? Then what, a radial menu with emergency modal screens?

Or maybe they click some buttons, forcing the occasional look away from the screen?

Maybe AI could do it all?

For this, voice is perfect. We have been following instructions by voice since humans could grunt. We do not require anyone to look away from the screen (ATC) or look down from the window outside (pilot) for any reason.

We do not require rebroadcast because everyone can hear and take initiative if required.

By what interface, specifically, should someone required to fly an airplane interact with ATC while flying that airplane? By what interface should someone who needs to see where everyone is all the time be able to contact that pilot that cannot look away from the world outside ever and cannot use their hands for anything but flying at a critical time?

Chesterton's ATC.

Kim_Bruning•1h ago
For starters, ADS-B is being rolled out, allows planes to 'see' each other and respond in real time.

https://en.wikipedia.org/wiki/Automatic_Dependent_Surveillan...

sdh9•55m ago
It’s been required in the US since 2020. But, ADS-B would not have played a factor in this incident.
Loughla•43m ago
Other than voice how would you send instructions that don't really on changing your focus? I can listen while doing other things. What else would you do?
fujigawa•30m ago
What do you propose that is better? VC-backed smartphone apps?

Aircraft have much better quality electronics than a $20 tabletop radio located some distance away by whoever is ripping the stream.

evil-olive•13m ago
> Audio quality is really bad.

as the video says at the beginning, the audio is sourced from LiveATC, which is a network of volunteers with their own radio equipment [0] who tune in to ATC frequencies and then livestream them.

those volunteers are by necessity not at the airport itself, but some distance away. and the audio is compressed to 16kbps MP3 for livestreaming purposes.

this means the sound quality we're hearing is going to be worse (significantly worse, in some cases) than what the pilots and controllers actually hear.

> They're sending instructions by voice.

I get that it's 2025 and it's tempting to say "everything should be a text message". but remember that there's 2 pilots in the aircraft, the Pilot Flying and the Pilot Monitoring [1].

under normal circumstances, the PM handles talking to ATC (among other duties). but both pilots have headsets that allow them to hear transmissions from ATC. and crucially for the Pilot Flying, they hear those messages without taking their eyes away from actually flying.

modern aircraft do have a text message system of sorts [2] but there is a very good reason why the crucial ATC instruction in this case ("turn right heading 270 immediately") happens via voice and not an ACARS message.

also, it's important to remember that airline pilots in the US have a minimum of 1500 hours of flying time, and pilots flying an A330 on an LAX-Rome route probably have significantly more than that. we're watching a 5-minute video and going "oh it's a bit hard for me to follow this" but for actual commercial pilots this radio chatter is routine and something they have been practicing for years.

0: https://www.liveatc.net/faq/

1: https://skybrary.aero/articles/pilot-flying-pf-and-pilot-mon...

2: https://en.wikipedia.org/wiki/ACARS

pedalpete•1h ago
Is this significantly different from the near mid-air collisions that happen on a regular basis?

The audio does an excellent job of showing a layperson how difficult it is to interpret and who's going wear based on sound, and then I had to go back through the video to see the turn.

These people aren't being paid to do this right now? Is that right? I'm not American, but that's what I've heard.

7thaccount•1h ago
Yeah. It's a super stressful job that doesn't pay well normally and now these people are having to drive Uber on the side to pay their mortgages and put food on the table. I'm definitely not flying until this is sorted out.
edoceo•1h ago
And maybe some time to ramp back up to pre-shit-show skill levels.
waiwai933•1h ago
I can't speak to the first question, but as to the second, correct, US air traffic controllers are not currently being paid.

[1]: https://www.nytimes.com/2025/11/07/travel/shutdown-air-traff....

[2]: https://www.nytimes.com/2025/10/20/us/politics/shutdown-air-....

[3]: https://www.theguardian.com/us-news/2025/oct/28/air-traffic-...

hdgvhicv•22m ago
Why are they turning up for work?
ezfe•14m ago
Because they will be back-paid when the government reopens and if they stop showing up then they will be fired. Now, you could ask: won't they be able to get a job back later, who knows.
Deradon•41m ago
Question for any aviation expert: Would TCAS be triggered at such a low altitude on departure?
aprentic•37m ago
I was watching KBOS https://www.flightaware.com/live/airport/KBOS on Thursday morning and saw a couple of Cape Air flights that looked like they were within 500 feet of each other. I suspect we'll be hearing more of these stories soon.
comeonbro•16m ago
If you are casually listening to ATC for fun then you should be able to recognize that the event in this story is not ATC error...
trollied•32m ago
Government shutdown. ATC are not being paid.

Sort your country out!

Dumblydorr•27m ago
Most Americans have zero agency in the matter. We vote once a year or two, most of our states or districts aren’t competitive, and the candidates we do elect can ignore their constituents easily.
theodric•25m ago
Who are you yelling at? Do you think the Trump administration reads Hacker News? What do you expect the average American taxpayer to do to fix a government shutdown?
hdgvhicv•11m ago
General strike. Certainly government employees should be on strike. Starting with secret service.
coolThingsFirst•5m ago
safest mode of transportation strikes again