My Advisory Circular network of twitter bots post in real-time whenever they detect aircraft flying in circles over cities around the world, including Los Angeles, Baltimore, Portland, Minneapolis, and London. The bots often tweet about news and fire aircraft, and because they use an uncensored source of data they also tweet police, FBI, DHS, DEA, CBP, and military aircraft. They look for circles because it means an aircraft is doing something instead of going somewhere. If you've ever asked “what is that helicopter/plane?” there’s a good chance my bots can answer your question—even if it's an advanced military surveillance plane.
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