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Technical details are described here: https://gitlab.com/jjwiseman/advisory-circular/

Things flying near an airport are excluded ("The centroid of the last 3 minutes worth of positions must be more than 2.5 km away from all known airports."). I've never seen it tweet about planes doing obvious pattern practice.

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It used to do a pretty good job of filter out pattern practice, but lately I feel like those false positives have actually become the #1 issue (maybe because my code was tuned for and worked fine around LA, but not other parts of the world). I'm working on some slightly fancier filtering to remove those.

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