Surely not true? Isn't it a GBE and therefore I owns the land .
You got me thinking Dick, when it comes time to offload assets then what happens to the land used by GBE's which is often funded/acquired on their behalf by the government. I couldn't find an answer but in my research came across this link:
https://www.finance.gov.au/property/gbe/
Finance’s Government Businesses and Advice Branch (GBAB) also provides advice to the Government on the following entities which are not prescribed as GBEs:
Airservices Australia
Snowy Hydro Limited
So it looks like AA is not a GBE and must have it's existence legislated elsewhere.