I'm a little confused about the no-fly zone radius around airports. In the Pilot app the red radius is right on the edges of the airport, of course the no-fly zone is actually bigger than this. However, when I use an app like Hover or a site like AirMap.io the radius around a large international airport is the same as one around a smaller county/regional airport. Is this correct? For some reason I thought it was a 5 mile radius around international airports and 2.5 miles around smaller airports. Reason I'm asking is because there is a location near (about 4 miles away) a small airport that I want to fly in, in the Pilot app its outside the red radius but on AirMap.io its just barely inside the red radius.