The more particular contention raised by the plaintiff on this aspect of the case is concerned with regs. 198 and 199. The first of these regulations provides that an aircraft shall not be used in regular public transport operations except under the authority of and in accordance with a licence (in the regulation referred to as an "airline licence") issued by the Director-General. "Regular public transport operations", by definition, means all air service operations in which aircraft are available for the transport of members of the public, or for use by members of the public for the transport of cargo, for hire or reward and which are conducted in accordance with fixed schedules to and from fixed terminals over specified routes with or without intermediate stopping places between terminals. By reg. 199 an applicant for an airline licence is required to furnish such information in relation to the proposed service as the Director-General requires. Thereafter follow specific provisions relating to the issue of such licences. It is clear enough that of its own force reg. 198 applies to regular public transport operations which constitute, within the meaning of reg. 6, international air navigation within Australian territory (par. (a)), air navigation in relation to trade and commerce with other countries and among the States (par. (b)), or air navigation within the Territories (par. (c)). No doubt, also, it may apply to other regular public transport operations in so far as they are conducted in controlled airspace and directly affect, or endanger, the safety of persons or aircraft engaged in any one of the three classes of air navigation mentioned. But it is, I think, clear that it has no application, of its own force, to regular public transport operations which are exclusively intra-State operations whilst they are being conducted outside controlled air space. There can be little doubt that the Commonwealth may, for obvious reasons, properly assume legislative jurisdiction over all air navigation in what, for want of a better expression, may be described as properly defined controlled airspace. No question has arisen concerning the validity of the assumption by the Commonwealth of legislative jurisdiction in this particular field but to say that the Commonwealth may legitimately require an aircraft to be licensed as a condition of its use in regular public transport operations in such airspace does not mean, either, that it may prohibit the use of aircraft in such operations solely intra-State outside controlled airspace, or, that a licence when granted under reg. 199 operating as a federal law constitutes any authority to the grantee to engage in intra-State operations outside such airspace. However, the plaintiff relies upon the generality of the language of both regulations to support the argument that, in spite of reg. 6, they must be taken to apply to all forms of regular transport operations without qualification. Possibly, as the plaintiff suggests the generality of the language may be thought to be emphasized by the fact that reg. 199 deals expressly, and somewhat differently, with applications for airline licences for inter-State services and applications for licences for services other than inter-State services. In terms the regulation differentiates between the functions of the Director-General in considering applications according to whether they fall within one category or the other. But if no such differentiation had been made and the regulation merely dealt with generally and uniformly with all applications for airline licences it would, I think, be impossible to say that its operation extended beyond the fields denoted by the explicit controlling provisions of reg. 6. And, notwithstanding the differentiation which is made, the same conclusion must follow. For it is made, not for the purpose of indicating any overriding intention contrary to reg. 6, but merely because of the provisions of s. 92 of the Constitution and in order to secure a right to an applicant for a licence for an inter-State service upon satisfying the conditions prescribed by sub-reg. (2) and, in respect of all other licences within the fields denoted by reg. 6, to give to the Director-General an absolute discretion. I should add, that if upon its true construction reg. 198 applied of its own force to regular public transport operations of a purely intra-State character I would gravely doubt its validity. In the first place it would, I think, be beyond the limited regulation-making power conferred by s. 26 of the Air Navigation Act 1920-1961 and, in the second place, I would be disposed to think that it travelled beyond constitutional power. On the latter point it should be observed that the only matter with which reg. 198 is concerned is the use of aircraft, which may otherwise be lawfully operated, for regular public transport operations. In other words all that it purports to do is to prohibit the use of aircraft for the purpose of transporting members of the public or cargo in regular public transport operations and I am unable to see any ground upon which Commonwealth legislation forbidding such operations without qualification within the limits of any one State could be justified.