Austin Lloyd Fleming was born on 7 August 1894 in Toronto, Ontario. His parents were Lydia Jane Orford and Robert John Fleming. He was a stockbroker before the First World War.
After joining military service on 10 November 1916, Fleming transferred from the Duke of Cornwall's Light Infantry to the General List of the Royal Flying Corps on 13 May 1917. He was appointed as a Flying Officer, with the rank of second lieutenant on probation on 16 May 1917, signifying that he had completed pilot's training. On 8 June 1917, he was assigned to No. 46 Squadron. He was reassigned to No. 111 Squadron in Palestine later that year.
Between 17 January and 12 April 1918, he scored eight aerial victories (listed below). His exploits gained him the Military Cross, although the award citation did not recognize all his feats. His MC was gazetted on 13 May 1918:
Temporary Lieutenant Austin Lloyd Fleming, Royal Flying Corps:
"For conspicuous gallantry and devotion to duty. He attacked a formation of three enemy machines, and forced the leading machine, which was a two-seater, to land, although the other two were attacking him from behind. He then attacked and destroyed another of the enemy machines, and engaged the third, which succeeded in escaping. He destroyed four enemy machines during one month, and showed splendid courage and skill on many occasions."
On 11 September 1918, Fleming was injured.
See also Aerial victory standards of World War I
On 1 June 1919, Fleming was transferred to the unemployed list of the Royal Air Force, ending his service. He would subsequently spend some years in the United States before moving to Britain.
With the advent of the Second World War, he returned to military service in the Royal Air Force. On 1 September 1939, he appointed as a captain. He would serve until 1 August 1942, when he once again gave up his commission and once again left the RAF.
In 1959, he presented No. 111 Squadron a souvenir machine gun taken from the reconnaissance craft he captured on 29 January 1918.
Austin Lloyd Fleming died in Málaga, Spain on 26 January 1969. He was buried in Mount Pleasant Cemetery in Toronto, and was survived by his wife, Helen Hyde Fleming and twin children, Bob and Louis.