BLEEP BLOOP: I just saw an aircraft with callsign #UAL716 (ICAO code #AB9B9D) flying at 312 kt at altitude 8125 feet MSL at coordinates 34.2095,-118.4476.

They must have had a 50 knots tail wind.

https://globe.adsbexchange.com/?icao=ab9b9d
https://www.openstreetmap.org/?mlat=34.2095&mlon=-118.4476#map=15/34.2095/-118.4476