BLEEP BLOOP: I just saw an aircraft with callsign #ASA1378 (ICAO code #A56866) flying at 312 kt at altitude 8400 feet MSL at coordinates 34.1640,-118.4921.

That's, like, super fast.

https://globe.adsbexchange.com/?icao=a56866
https://www.openstreetmap.org/?mlat=34.1640&mlon=-118.4921#map=15/34.1640/-118.4921