Dick, an important feature of ICAO Class G is that it doesnt provide DTI to IFR/IFR. So then when it is said that Oz should adopt a US FAA NAS style airspace architecture as worlds best practice, does that mean we drop this element off to be ICAO compliant in G ?
Is it possible that with our enhanced G (with DTI) we are actually already worlds best practice and especially so with our traffic numbers ?
I think I now understand why they have only very low G airspace in US, it is because there is no ATS provided in it.