Creamie,
We will have to agree to differ, when it come to airspace designation, and the heart of the argument goes to the limits of Cth powers under the Constitution S.51(xxix) external affairs.
I am of the view that the Cth does NOT possess the power to designate airspace applicable to Australian aircraft in international airspace ( and certainly not in the sovereign airspace of another state) as Australia is not a signatory to any treaty or convention that allows such an action.
The powers of Australia over Australian aircraft is not without limit.
Tootle pip!!