Look carefully, especially if you live near an Alpha or Beta level global city NYC, LA, SF, Chicago, DC, Miami in the United States. FlightAware took out the wealthy's private planes from their database at their request. There's lodes of exceptions to tracking if you are monied.

What we need is more people running things like RTL-SDRs to acquire data the rich and powerful want hidden to avoid exposure for shady activities.

https://www.propublica.org/article/off-the-radar-private-pla...