Well not all are spying most are not, about 40 story's building is about 500ft high.
The ones that are following and circling are way lower.
Note: It takes awhile to get a plane or chopper certified.
They are allowed to take check rides or being moved. Like a car
with no plates. Unmarked aircraft are illegal.
So if unmarked it is maybe in the process.
I have seen the unmarked stuff too and this was my conclusion.
It is something u don't know much about because it has not been studied or learned.
Later J:)
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