Commercial aviation trackers publish the movements of private aircraft to anyone who looks. A principal's location and pattern of travel are knowable in close to real time, and the published record extends years back. The pattern is more revealing than any single flight.
The aircraft itself is the easy half. Its tail number, registered owner, and operating company are all on public registers. The harder half is the link between the aircraft and the person travelling on it, but that link is rarely difficult to make for a known principal. The aircraft of an estate, an office, or a serious private operator is usually identifiable to a determined reader.
What the assembled record shows is the pattern: the routes most used, the destinations most visited, the times of year when travel intensifies. From this it is possible to infer commercial relationships that are not otherwise disclosed, family ties that the principal had kept private, and the rhythm of a life that the principal would have considered their own.
Several jurisdictions allow the blocking of identifying data on the trackers. The blocking is partial; the underlying record persists. The work is to understand what is presently shown, to know what the published pattern currently suggests, and to weigh the operational decisions that follow.
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What can be found can be known. What to do about it is a separate question.
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