Kinda obvious, but first off it is "Air Frontier" and from what I recall they operate out of Darwin, Gove and Borroloola (Don't quote me on the Borroloser one).
In regards to working for them, expect to be taking for a ride to start, known a few people very recently who were working for free around their office, cleaning aircraft etc... they got a little time with them, mostly ICUS, but one in the end was told "Oops sorry, turns out we don't need you now, but thanks for the free labour!!" and another one it dragged on so long (3 months if I remember correctly) they he got fed up and left.
Unless things have changed in the last month or two, good place to get some hours if you can actually get a job, but expect to be stuffed around.