Josh.
I am however certain that, operating an aircraft on a charter does require an AOC. Has BA ever operated XGX ?
Charter aircraft are not specified by S/N and Rego on an AOC, although RPT are. The questions about who is doing what, with which and to whom for how much will be clear enough from the facts of the case.
If the pilot was "lent" to the other company, he should have been checked out in accordance with that company's Ops Manual C&T manual
and subject to their SOPs etc.
If the charter was sub-contracted to the pilot's employer, then he is operating under
his employer's AOC, C&T system, SOPs.
CS,
That's not murky - there is a paragraph or 20 in the CAO's about charter substitution on RPT and the requirement that it be approved by CASA.
The rule book is quite clear on it. Dodgy - perhaps. Murky - no