[ajdlinux]

Australia has federal legislation that applies state law to federal land, in general (the Commonwealth Places (Application of Laws) Act 1970).

(Also, it's only major airports - state capital city airports, plus a handful of regional airports that were formerly owned by the Federal Airports Corporation - that are federal land. Most airports in Australia are small regional airports that are and were always owned by local government and not subject to the special federal land ownership and leasing regime of the major airports.)

[cjrp]

Adelaide looks like it's actually operated by a private company too.

[ajdlinux]

It is operated by a private company, but as a former Federal Airports Corporation airport, the land on which the airport is built is owned by the Commonwealth and leased to the private operator on a 99-year lease.