Steven Spielberg is in the air again. Departed Atlanta and is currently descending through 15,000 feet east of Baltimore. Did a dig to positively verify this is Spielberg's jet. So the list of tail numbers the anon dropped a couple of nights ago appears legit. Roman Abramovich and Spielberg have both been tracked and verified now. Will update as destination becomes apparent.
N900KS - GULF GROUP ENTERPRISES LLC (LOS ANGELES CA)
This aircraft (N900KS) is not available for public tracking per request from the owner/operator.
https://flightaware.com/live/flight/N900KS
https://www.corporationwiki.com/p/2lesb1/gulf-group-enterprises-llc
https://www.corporationwiki.com/California/Beverly-Hills/amblin-entertainment-inc/40418437.asp