First of all let Genex defend his alma mater.......we learned good things there. Other, newer MBAs might have stuffed things up but at our last reunion we all agreed we had used our powers for good only.
But I digress......
No small part of the Jetstar brand is the defense of Qantas yields, a task which by definition the mainline brand cannot do for itself but done by Jetstar as a strength of the group.....and not something yet replicated so successfully, at least in the airline sector. There are of course many other parallels in other business spheres as you would know.
So yes, there is cross-subsidization Mstr Caution and you better hope it continues because without JQ holding up the yields of those who pay your salary you could be selling pencils on the street corner.