Hi Jason,
ACA125 CYYT-CYYZ-CYYC
Nothing concrete on CFG4083, normally the flight uses CFG83 as its flight ID, but for ticketing etc its commerical flight number has a 0 added before the 83 and the day of the week added at the beginning therefore CFG4083 would be Thursdays CFG83 KLAS-EDDF. I would imagine that the 4083 is an infrequent error in adding the flight data to the aircrafts FMS instead of 83.
Alan