Its not just the flight ID which appears problamatic with the CRJ'S, Air Canada's C-GFJZ is sending out 4 or 5 different hex codes at a time just now, the following is from another forum
Well it seems like this one is transmitting more and more miscodes. For the
record the list I have now is as follows:
005200, 005220, 0052A0, 0052E0, 00C0E0, 8052E0 as well as the correct code for C-GFJZ, C052E0
It always transmits it's correct code first though and only sends the miscodes
on arrival, so it's only the one dodgy transponder.
Alan