The 1950s to 1970s was a period of great migration from Europe to Australia primarily via the Suez Canal. Some companies benefited from Australia's subsidized immigration scheme. Jet aircraft were not a serious threat until the early 1970s, when "jumbo jets" dominated the busiest trade routes.
Various shipping lines sailed across the Indian Ocean from the Far East to Europe. Others carried travelers on wonderful, long voyages across the Pacific from the U.S.A. & Canada to Australia & New Zealand. Some lines offered voyages completely around the world.