What the difference between Silvert and Silverjet??

(FJE) flightaware.com/live/flight/FJE102

(SLR) flightaware.com/live/flight/SLR101

Looks like they changed ICAO codes and callsigns, but someone forgot to tell ETMS to stop filing the old flight plan every day.

ETMS ?

fly.faa.gov/Products/Informa … /etms.html