I think there are a sufficient number of words from a sufficient number of judges to support the conclusion that the Commonwealth has power with respect to the safety regulation of aviation. And pray to whatever deity/ies to which you might subscribe, sacrifice an animal, rub whatever crystals and burn whatever incense as keeps the evil spirits away, that 6 states and numerous Territories don’t have power, in addition to the Commonwealth, to set up their own little CASAs with their own little intrastate aviation safety regulatory rules.
The problem is CASA’s selectively convenient interpretation of the word “safety”. It’s a word that means almost everything and just about nothing. “Safety” is an infinitely malleable concept that is therefore justification for just about anything.