BLEEP BLOOP: I just saw an aircraft with callsign #ASA1378 (ICAO code #A2C087) flying at 312 kt at altitude 6950 feet MSL at coordinates 34.2150,-118.4736.

They must have had a 50 knots tail wind.

https://globe.adsbexchange.com/?icao=a2c087
https://www.openstreetmap.org/?mlat=34.2150&mlon=-118.4736#map=15/34.2150/-118.4736