In what directional situation in Australia would one have found the main base of operation for the Aero-Tropics Air Services?
Aero-Tropics Air Services:  Its main base was Cairns Airport, with its operating hub at Horn Island Airport. Queensland:  Situated in the north-east of the country, it is bordered by the Northern Territory, South Australia and New South Wales to the west, south-west and south respectively.
i don't know