Was just having a look at the leasing arrangements for the A330s. Qantas lease 10 A330s from outside leasing companies to be operated by mainline. At the same time, Jetstar also lease 6 A330s from mainline. For this arrangement to be profitable for mainline, you would expect that mainline would charge Jetstar more for their operating leases than mainline pays to the outside leasing companies. Which begs the question, why wouldn't Jetstar lease directly from the outside leasing company as opposed to Qantas mainline?
I believe once 787s arrive the A330s go back to mainline hence some logic in being bought by Qantas.