So I started calling airports.
No need to do that, as you may have noticed already (FR24, for example). Here is another visual for you....an actual high altitude aviation chart, showing the various routes over Redding, CA:
Once you open it (I suggest on a larger monitor screen, for better comprehension) you can use it much like Google Maps....zoom in/out, and hold the mouse button to slew.
Additionally, I have found that the SkyVector website tends to "remember" (probably with cookies) what you previously viewed, each time you open it. Also, it seems to use your IP address to determine location (if no previous cookies).