Here is an example of local knowledge: I once worked in an office at the end of runway 27 right at ohare, chicago. It was known, at least in that circle, that there were over 2000 operations (take-offs and landings) at ohare daily. That was known to be more than the 1440 minutes in the day. That coupled with the knowledge that there were few operations between midnight and 6am meant that at peak hours there were often three events in one minute.