Fred Gassit, we do have to do positioning flights. They are empty legs. Some of these positioning flights range from 10 min to well over 3 hours.
Fortunately, the business has grown so that the revenue to positioning ratio's improved a lot.
The bizjet market in Europe (yes I know it's not Australia but Asia's not far away) has grown massively since the demise of the Concorde, Sept 11 and any time there's a "scare" in London.
The smarter airlines are now teaming up with bizjet operators to provide intra Europe "first class" or setting up business class only aircraft to provide that service.