I suggest that whenever anyone receives an account from Avdata that is clearly wrong (i.e. for missed approaches, aircraft was nowhere near location at the time stated) that they return the bill, with corrections, & at the same time include in the envelope an account for YOUR services to correct their mistakes!

DF.

Oz,
An interesting situation, indeed. The Commonwealth Constitution does not cover aviation, aviation is states rights, and there is a fascinating (if you are interested in that sort of thing) history of court cases, through to the High Court. Google Goya Henry.

The Air Navigation Act gives effect to Australia signing the "Chicago Convention", based on the Commonwealth's powers to sign treaties (S51(i) ??), but that is limited to matters covered in that treaty.

An example is often quoted: The convention makes no reference to airshows, there for the Commonwealth (CASA) has no power to regulate airshows. As far as I know, this proposition has never been tested. It has also been claimed that the Commonwealth's corporations powers can be extended to cover aviation, but I do not know if this has ever been tried.

There are significant recent sections of the Civil Aviation Act 1988 that are bluff, but who can afford to take CASA to the High Court?
CASA has no powers of commercial regulation, not withstanding CAR 206.

All the above is a bit of an over simplification, but you get the drift.
Tootle pip!!