Apart from Defence, I think a couple of Federal Govt departments (Immigration and PM's??) also use one of the name entities to source charter aircraft.
Surely an organisation the size of the Govt and with the expertise it has within, one would have to ask why it's necessary to go through third parties to secure charter aircraft? The money some people are profiting from the Govt would be enough to hire a dozen or so aviation experts to do this necessary work at a considerable saving and benefit to the taxpayer.
The bloke from the Fairfax group (SMH and THe Age) obviously has some good contacts but I hope he can dig deeper as the txpayer is far frm well served. Business as usual?.