Every red dot in the image above is civil (non-military) airplane in flight. The image is a generalization of a dazzling amount of information available at FlightAware.com — a collection and sometimes animation of USA flights. The image above, grabbed today as a screenshot is:
Tracking 5,121 airborne aircraft with 46,982,276 total flights in the database.
FlightAware has tracked 52,453 arrivals in the last 24 hours.