Darwin
Hardy Aviation
Chartair
Direct Air
Air Frontier
Av8
Australasian Jet
Pearl
Vincent
Airnorth
Pel Air
Jabiru
AAA Air Charter
Kakadu Air Services
Alice Springs
Australasian Jet
Chartair
Pearl
Alice Springs Aero Club
Kunus
Alligator
Slingair
Shoal Air
Wyndham
Wydham Air Charter
Halls Creek
Broome Aviation base
Broome Skyways
Derby
Bushflight/Reeflight
Golden Eagle
RFDS
Broome
King Leopold Air
Broom Aviation
(several float plane operators)
Port Hedland
Polar Aviation
RFDS
Karratha
Karratha Flying Services
Tropic Air Karratha Base
Exmouth
Norwest Air Services
Carnarvon
Tropic Air
Shark Bay
Shark Bay Air Charter
Kalbarri
Kalbarri Air Charter
Geraldton
Shine Aviation Services
Geraldton Air Charter
Batavia Coast Air Charter
Kalgoorlie
Goldfields Air Services
There are a couple of smaller operators that I have more than likely forgotten but the vast majority are there.