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: Lip-Air Pty Ltd, operating as Aero-Tropics Air Services (ATAS), was an airline based in Cairns, Queensland, Australia. Queensland: Queensland (abbreviated as QLD, or less frequently Q) is the second-largest and third-most-populous state in the Commonwealth of Australia. 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