QF charge exhorbitant rates to JQ for certain things too...
Perhaps.....or perhaps not.
A colleague of mine put in a suggestion at one of the international terminals about how they could make an extra $100K per annum from customer airlines. His manager was very excited and asked how. Colleague informed him that they should be charging J* the same as they charged other customer airlines for an aircraft dispatch. The idea was quashed very quickly and consequently that segment of the business- customer airlines- wasn't producing the revenue it could have been otherwise. Looks bad for QF's numbers and J* get their maintenance significantly cheaper than they would have otherwise.
That time and effort for J* aircraft was being diverted from other possible customers which would have brought in greater revenue so a double whammy for QF.