The numbers I gave were national averages for the US. Of course those numbers will vary by location. That said... you'd be surprised how many flights out of th

The numbers I gave were national averages for the US. Of course those numbers will vary by location. That said... you'd be surprised how many flights out of the small GA airports in big cities aren't personal flights. Air ambulance, news crews, law enforcement, firefighting (usually more on the periphery of the city), utility companies doing inspections, and aerial photography all tend to operate from these locations. On the other hand, I'd certainly expect the number of flight school operations to be higher in areas with a large population.