You asked about Air Taxis
12 people built something like it. 2 are gone.
That is 18% of the ones whose fate we could settle, against 23% across the whole register. 1 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2021-06-01 | YCLemFi Fair, simple and accessible financial services · lemfi.com | still up |
| 2021-01-01 | The lightest electric aircraft motors in the world. · h3x.tech | still up |
| 2021-06-01 | On-demand auto maintenance & repairs · mechoautotech.com | still up |
| 2021-06-01 | The fastest way to ship airtight AI · openlayer.com | still up |
| 2021-06-01 | YCODWEN AirBnB for Small Warehouses · odwen.co.in | still up |
| 2021-01-01 | YCAurabeat Providing clean, safe, virus free air for homes, buildings and cars · aurabeattech.com | still up |
| 2021-06-01 | YCHeimdal Affordable and verified direct air carbon capture and storage · heimdalccu.com | gone |
| 2021-06-01 | Vertical takeoff and landing aircraft for major airlines · odysaviation.com | still up |
| 2021-06-01 | Manage your website from your favorite tools like Airtable and Notion · whalesync.com | still up |
| 2021-01-01 | YCNoya Radically reducing capital costs and build time for direct air capture · noya.co | gone |
| 2021-01-01 | YCStacksi Automated Answers to Security Questionnaires · stacksi.com | acquired |
| 2021-06-01 | Semi-Autonomous Diagnostics for Emergent Care · cairehealth.com | still up |
How this compares
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.