Peter Duniho wrote:

You will have the same issue in any urban area. Nor is there any reliable
means of identifying "regular routes" for all but the largest airplanes
going to and from a large commercial airport. General aviation traffic is
*much* less uniform than that.

however, there are a number of things that a local pilot might help
identify; for instance, the usual/commonly used reporting points
when coming in to land at the local fields, the 'practice areas'
used by the local clubs/FBOs, the local places used to practice
aerobatics, the usual sight seeing locations, the route the locals
like to follow for easy navigation, or because it avoids some busy
airspace, or because there is a really cool onfield restaurant,
etc. I mean, it's not 100% reliable of course, but it could be
a start.

--Sylvain