One thing to keep in mind....There are many airplanes that have filed for faa exemptions so that they cannot be tracked on public websites. They typically are used for business deals, execs, mergers etc. Usually callsigns are “dot com”. If you have a radio capable of listening to frequencies for center control or approach/departure control and listen for “dot com” callsigns you could infer what planes are coming in from where. Even then, tracking actual N numbers and figuring out flight olans would be next to impossible without being at the local FBO and seeing who gets off and on.