The other related question is 'what do QF charge J* for an aircraft dispatch out of SYD and what do they charge other 'customer' airlines?'.
Keg, Do you think other airlines have the costs of an unscheduled overnight in Sydney paid by QF engineering. If engineering fail to provide a "serviceable" aircraft by curfew. Hence, the statement the contracted services provided by mainline are not at "commercial" rates.
MC