BLEEP BLOOP: I just saw an aircraft with callsign #ASA585 (ICAO code #ACCB2B) flying at 316 kt at altitude 8975 feet MSL at coordinates 34.1574,-118.6082.

They must have had a 50 knots tail wind.

https://globe.adsbexchange.com/?icao=accb2b
https://www.openstreetmap.org/?mlat=34.1574&mlon=-118.6082#map=15/34.1574/-118.6082

BLEEP BLOOP: I just saw an aircraft with callsign #KLAX (ICAO code #ACCB2B) flying at 310 kt at altitude 8325 feet MSL at coordinates 34.1957,-118.6438.

That's, like, super fast.

https://globe.adsbexchange.com/?icao=accb2b
https://www.openstreetmap.org/?mlat=34.1957&mlon=-118.6438#map=15/34.1957/-118.6438