Apocalypse warning system, based on fleeing private jets

The Apocalypse Early Warning System by Kyle McDonald was built on the premise that rich folks will use their private jets to get out quick in case of a global emergency.

This site watches a fixed cohort of business jets and asks a simple question: is the number currently airborne unusual for this time? It is not tracking all aircraft. The original version used an FAA-only business-jet list. The current tracker builds a broader global aircraft metadata table by merging ADS-B Exchange aircraft records, Mictronics/tar1090 records, and FAA registry data by ICAO hex. The importer classifies metadata into business jets, military aircraft, large airliners, regional airliners, non-jet aircraft, and other known types, then applies a practical business-jet filter. Each tracked aircraft is matched in live data by its ICAO hex identifier.

I think this is only partially tongue-in-cheek? Data is updated every half hour and you can sign up for updates through Telegram or text.