Not necessarily.I've carried horse handlers and cargo masters who were employed by the consigner and they were on the General Declaration as crew.Also there are a lot of contract cabin crew who dont work for the airline/operator.Qantas is or was one such operator
That was International and it may be different to Domestic but as I said, I still cant see why a flight from a non Australian port of origin to an Australian port is domestic?
Wunwing