BAL is owned by:
JF Infrastructure, Colonial First State and Westscheme, as far as I care to search.
JF Infrastructure is
50% Leighton
50% Mirvac
Colonial First State is indeed CommBank, it seems MacBank sold all their airport stock off to CommBank since last time I looked
Westscheme is a superannuation fund
An interesting article on how CFS views airports:
Money management
All of the above want to make money out of it. One way or another. None I am sure care about GA. Whatever will make more money. At the end of the day, they all ARE property developers.