BLEEP BLOOP: I just saw an aircraft with callsign #JBU458 (ICAO code #A7BBE9) flying at 318 kt at altitude 8950 feet MSL at coordinates 34.2232,-118.4570.

They must have had a 50 knots tail wind.

https://globe.adsbexchange.com/?icao=a7bbe9
https://www.openstreetmap.org/?mlat=34.2232&mlon=-118.4570#map=15/34.2232/-118.4570