Jetstar make squillions from freight because Qantas pays them $6000+ per A330 departure regardless of what is carried according to Senator Xenophon's address to the Australian Senate.
That is a minimum of $2,808,000 in guaranteed annual revenue for 9 return flights a week.
Not bad if you can get it and is most certainly not representative of any arms length commercial arrangement that I have ever seen.
Then, there are the cost and revenue allocation issues that make this such an "amazing" business.
