As I read this thread, I was reminded of a study from a decade or so ago, entitled "
Trajectory Clustering and an Application to Airspace Monitoring." Actually, what I remembered is a a graphic, based on three months of Northern California TRACON records for the Bay Area. Here it is:
It's really a tribute to the industry and to the skills and professionalism of pilots and ATCOs that almost all of the millions of us who sometimes fly in and out of the Bay Area (and other busy destinations), in any seats, are alive and mostly undamaged.