Australia–United Kingdom relations
In 1766 during his first voyage to the Pacific, Royal Navy captain James Cook sailed along and mapped the east coast of Australia, which he named New South Wales and claimed for Great Britain. Seventeen years later, following the loss of its American colonies in 1783, the British Government sent a fleet of ships, the "First Fleet", under the command of Captain Arthur Phillip, to establish a new penal colony in New South Wales. A camp was set up and the flag raised at Sydney Cove on 26 January 1788, and the British Crown Colony of New South Wales was formally promulgated on 7 February 1788. Further Crown Colonies were established in Van Diemen's Land (now known as Tasmania) in 1803; Swan River Colony (now known as Western Australia) in 1828; South Australia in 1836; Victoria in 1851; and Queensland in 1859. The six colonies federated in 1901 and the Commonwealth of Australia was formed as a Dominion of the British Empire.
Australian Air Corps
On 17 June 1920, Cole, accompanied by De La Rue, flew a DH.9A to an altitude of , setting an Australian record that stood for more than ten years. The effects of hypoxia exhibited by Cole and De La Rue intrigued the medical officer, Captain Arthur Lawrence, who subsequently made observations during his own high-altitude flight piloted by Anderson; this activity has been credited as marking the start of aviation medicine in Australia. Later that month, flying an Avro 504L floatplane, De La Rue became the first person to land an aircraft on the Yarra River in Victoria. On 22 July, Williams, accompanied by Warrant Officer Les Carter, used a DH.9A to make the first non-stop flight from Sydney to Melbourne. A few days earlier, Williams and Wackett had flown two DH.9As to the Royal Military College, Duntroon, to investigate the possibility of taking some of the school's graduates into the air corps, a plan that came to fruition after the formation of the RAAF.
Between July and November 1920, trials of the Avro 504L took place on the Navy's flagship, HMAS "Australia", and later aboard the light cruiser HMAS "Melbourne". The trials on "Melbourne", which operated in the waters off New Guinea and northern Australia, demonstrated that the Avro was not suited to tropical conditions as its engine lacked the necessary power and its skin deteriorated rapidly; Williams recommended that activity cease until Australia acquired a purpose-designed seaplane.