Well, actually it is a plane.
It's a quiet night at LAX. Well, it was 10 minutes ago. How do I know? The very cool AirportMonitor from Passur.
All of the data in "current" mode is 10 minutes delayed for security. Other airports using the system include Boston, Burbank, New Orleans, and a few others.
Somewhat unsurprising is the swarm of helicopters over the city.