The plaintiff, Ansett Transport Industries (Operations) Pty. Ltd., previously known as Australian National Airways Pty. Ltd., seeks relief by way of declarations, injunctions and damages against the defendants in connexion with the proposed importation into Australia of two Carvair aircraft by the third defendant, Air Express Ltd. ("Air Express"), and of two Argosy aircraft by the fourth defendant, Interstate Parcel Express Co. (Australia) Pty. Ltd. ("Ipec"). The plaintiff's case is that the proposed issue by the second defendant, the Secretary of the Department of Transport, of import permits under reg. 4(2) and the Third Schedule of the Customs (Prohibited Imports) Regulations in relation to the four aircraft would constitute or involve a breach on the part of the first defendant, the Commonwealth, of its contractual obligations under agreements made in 1952, 1961, 1972 and 1973 to which the plaintiff and the Commonwealth were parties and which were approved respectively by the Civil Aviation Agreement Act 1952, the Airlines Agreements Act 1961, the Airlines Agreements Act 1972 and the Airlines Agreements Act 1973. The plaintiff claims that by the 1952 Agreement, which was continued by the later Agreements, the Commonwealth contracted with the plaintiff that it would permit only the plaintiff and the Australian National Airlines Commission ("the Commission") to operate airline services for passengers and freight on trunk routes in Australia during the continuation of the Agreements. The plaintiff then contends that the issue of the permits by the second defendant is for the purpose of enabling Air Express and Ipec to carry freight between the mainland and Tasmania, that this is a trunk route, and that the issue of the permits therefore constitutes a breach of contract by the Commonwealth. It is alleged that Air Express holds a charter licence under the Air Navigation Regulations which authorizes it to operate air services on this route and that Ipec is an applicant for an airline licence under the regulations authorizing it to operate on this route. The plaintiff then claims that if the import permits for the four aircraft are granted, the second defendant will be required to issue airline licences to Air Express and Ipec for the route. The unexpressed assumption is that they have applied, or will apply, for such licences. Alternatively, basing its claim on an allegation that the Minister for Transport stated that he had approved the import of the aircraft for that purpose, the plaintiff alleges that the Commonwealth, by encouraging or directing the second defendant to issue the permits, is committing, or threatens to commit, a breach of contract.