From a reader:
Flurry's jet at one time could be tracked using various flight trackers, but unfortunately, they have the option to turn off the tracker system being a private aircraft.
However, there are "airport watchers" who as a hobby , note the tail numbers of the various planes landing at sites around the world. Some people have the hobby of trying to find far away radio station call letters, others, register train locomotive numbers. A sort of "collect the set" kind of thing. These folks like to watch airplanes and keep journals of tail numbers.
Flurry's PCG Jet has the tail number of N127RR . Not all flights get recognized, but a few are made note of by airport watchers. Here is the list on the public site...
Screenshot off Twitter
Showing landings near London.
I hope this gets posted, just so that the Flurry crowd knows that they have "eyes on them" and that turning off tracking, didnt totally assure anonymity.