BLEEP BLOOP: I just saw an aircraft with callsign #SWA2496 (ICAO code #A57F42) flying at 314 kt at altitude 8300 feet MSL at coordinates 34.2392,-118.4306.

They must have had a 50 knots tail wind.

https://globe.adsbexchange.com/?icao=a57f42
https://www.openstreetmap.org/?mlat=34.2392&mlon=-118.4306#map=15/34.2392/-118.4306