How does ATC prove that someone has entered Bravo airspace?
Radar

While true, radar doesn't seem up to the task for a clip. The three
radar tracks of the Cirrus crash over the East River in NY differ by
enough to convince me that radar could easily indict somebody who was
actually outside the airspace.

Jose
--
Humans are pack animals. Above all things, they have a deep need to
follow something, be it a leader, a creed, or a mob. Whosoever fully
understands this holds the world in his hands.
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