You asked about Air Taxis
22 people built something like it. 4 are gone.
That is 19% of the ones whose fate we could settle, against 23% across the whole register. 1 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2022-10-31 | airbrush.ai | still up |
| 2020-01-01 | YCAirbyte Context layer for production-grade AI agents · airbyte.com | still up |
| 2021-06-01 | The fastest way to ship airtight AI · openlayer.com | still up |
| 2020-01-01 | Building an AI Health Insurance Agent. · medicarevox.com | still up |
| 2022-11-29 | airy.co | still up |
| 2023-06-01 | AI Agents For RFP and Questionnaire Response Automation · inventive.ai | still up |
| 2022-01-01 | We go all out to Build the Smartest AI-Enabled Cameras! · avairsense.com | gone |
| 2023-01-19 | useadrenaline.com | still up |
| 2020-01-01 | YCSkypher AI agent for Compliance Questionnaires Automation · skypher.co | still up |
| 2026-06-01 | YCBernard AI employees that run home appliance repair companies · bernardhq.com | still up |
| 2023-06-01 | AI Agents for Healthcare RCM · cairhealth.com | still up |
| 2022-06-01 | AI workforce for mortgage · flairlabs.ai | still up |
| 2026-09-04 | airuncode.com | unverified |
| 2024-06-01 | AI Property Manager for Airbnb & Short-Term Rental Hosts · prohost.ai | still up |
| 2025-09-01 | YCAirCaps The AI copilot for in-person conversations. · aircaps.com | still up |
| 2022-06-01 | No-code data curation for LLM fine-tuning and evaluation. · airtrain.ai | gone |
| 2023-01-01 | AI Co-Pilot for Health Insurers to Authorize Treatment Faster · fairwayhealth.co | acquired |
| 2022-06-01 | YCDialect AI copilot for forms, questionnaires & RFX · usedialect.com | gone |
| 2026-01-01 | YCFed10 AI Agents for Government Affairs · fed10.ai | still up |
| 2016-06-01 | Airo is an AI wearable to track mental health. · airohealth.com | gone |
| 2025-01-01 | AI for air traffic control · enhancedradar.com | still up |
| 2024-09-01 | AI that gets aircraft flying faster · tryforerunner.com | still up |
| 2023-01-01 | YCPair AI Reimagining education with short form video and AI · pairai.com | still up |
How this compares
Y Combinator reports its own outcomes, including acquisitions. The other two are judged by asking the domain, so they are not measured the same way and are never averaged together.
The register re-probes every domain it holds. Some that answered last month stop answering. We send that list — what went quiet, and what it was — once a month. Nothing else.
How this was made. Show HN entries are every post from 2021 to 2023 with at least five points that linked to its own domain; code hosts and free hosting are excluded, because a repository outlives the effort behind it. Product Hunt entries needed 100 votes — a far higher bar, so they are the promoted top slice rather than a like-for-like sample. Both are judged by asking the domain whether it still answers: gone means it no longer resolves, refuses the connection, serves a parking page, or says plainly that it shut down. An HTTP error is not counted as gone — a server answering 404 is one somebody still pays for, and an audit of 25 gone-calls found two such sites alive with only a moved homepage. Y Combinator entries use the status YC publishes itself, which is why only those can say acquired. Squatted domains — a lapsed name now serving somebody else's site — are not detected, so these figures run slightly low.