Airlines of New South Wales Pty Ltd v New South Wales (No 2) (1965) 113 CLR 54 was a High Court of Australia case about the validity of Commonwealth regulations about intrastate air navigation. Although the Commonwealth has the power to regulate interstate air navigation under s 51(i) of the Constitution, it can only regulate intrastate air navigation under the implied incidental power attached to that head of power. It was held that intrastate air navigation can be regulated to the extent that it provides for the safety of, or prevention of physical interference with, interstate or foreign air navigation.