Mackinolty remained in England following the end of hostilities, serving as "officer in charge of Australian packing" at RAF Hendon, near London, from December 1919 to September 1920.
In this role he was responsible for crating and shipping to Point Cook the 128 aircraft and associated spares, weaponry, vehicles, hangars and other equipment that made up Britain's post-war Imperial Gift of Royal Air Force surplus to Australia, which eventually filled 19,000 cases.
Mackinolty also completed formal training in aeronautical engineering before returning to Melbourne in October 1920.
Discharged from the AIF in January 1921, he worked in the automotive industry and took a correspondence course on internal combustion engines.

On 8 August 1921, Mackinolty was commissioned as a flying officer in the newly formed Royal Australian Air Force (RAAF).
A member of the Stores and Accounting Branch, he commenced service with No.
 1 Aircraft Depot at Point Cook in December.
He was assigned to the staff of RAAF Headquarters, Melbourne, in 1924.
On 20 November that year, he married Eileen Moore at Christ Church, South Yarra; the couple had a son and a daughter.
In 1925, Mackinolty was posted as Equipment Officer to No.
 3 Squadron at the recently established RAAF Station Richmond, New South Wales.
 Promoted flight lieutenant, he was appointed Director of Transport and Equipment at RAAF Headquarters in 1929, effectively making him the Air Force's senior supply officer, a role he would occupy for the next twenty-two years.
His continuous tenure in essentially the one post was comparable to the RAAF's other chief logistician, Squadron Leader (later Air Vice Marshal) Ellis Wackett, who served as its senior engineer for twenty-four years, from 1935 to 1959.

Mackinolty's position was redesignated Director of Equipment in April 1935.
At around this time, he collaborated with Squadron Leader George Jones, then Director of Training, on an investigation into the state of aircraft production in Australia to highlight shortfalls in local defence in the face of possible future conflict with Japan.
 Though the report was reviewed enthusiastically by the Air Member for Personnel, Wing Commander Bill Anderson, it apparently went no further in the chain of command and thus was effectively ignored.
Raised to squadron leader, Mackinolty was appointed an Officer of the Order of the British Empire in the Coronation Honours on 11 May 1937, in recognition of his achievements in stores and accounting.
In February the following year he was promoted to  wing commander.
The punctilious Chief of the Air Staff, Air Vice Marshal Richard Williams, sometimes complained that Mackinolty did not pay enough attention to his personal appearance, but never failed to acknowledge his "professional excellence".
Mackinolty remained in England following the end of hostilities, serving as "officer in charge of Australian packing" at RAF Hendon, near London, from December 1919 to September 1920. In this role he was responsible for crating and shipping to Point Cook the 128 aircraft and associated spares, weaponry, vehicles, hangars and other equipment that made up Britain's post-war Imperial Gift of Royal Air Force surplus to Australia, which eventually filled 19,000 cases. Mackinolty also completed formal training in aeronautical engineering before returning to Melbourne in October 1920. Discharged from the AIF in January 1921, he worked in the automotive industry and took a correspondence course on internal combustion engines.
On 8 August 1921, Mackinolty was commissioned as a flying officer in the newly formed Royal Australian Air Force (RAAF). A member of the Stores and Accounting Branch, he commenced service with No. 1 Aircraft Depot at Point Cook in December. He was assigned to the staff of RAAF Headquarters, Melbourne, in 1924. On 20 November that year, he married Eileen Moore at Christ Church, South Yarra; the couple had a son and a daughter. In 1925, Mackinolty was posted as Equipment Officer to No. 3 Squadron at the recently established RAAF Station Richmond, New South Wales.  Promoted flight lieutenant, he was appointed Director of Transport and Equipment at RAAF Headquarters in 1929, effectively making him the Air Force's senior supply officer, a role he would occupy for the next twenty-two years. His continuous tenure in essentially the one post was comparable to the RAAF's other chief logistician, Squadron Leader (later Air Vice Marshal) Ellis Wackett, who served as its senior engineer for twenty-four years, from 1935 to 1959.
Mackinolty's position was redesignated Director of Equipment in April 1935. At around this time, he collaborated with Squadron Leader George Jones, then Director of Training, on an investigation into the state of aircraft production in Australia to highlight shortfalls in local defence in the face of possible future conflict with Japan.  Though the report was reviewed enthusiastically by the Air Member for Personnel, Wing Commander Bill Anderson, it apparently went no further in the chain of command and thus was effectively ignored. Raised to squadron leader, Mackinolty was appointed an Officer of the Order of the British Empire in the Coronation Honours on 11 May 1937, in recognition of his achievements in stores and accounting. In February the following year he was promoted to  wing commander. The punctilious Chief of the Air Staff, Air Vice Marshal Richard Williams, sometimes complained that Mackinolty did not pay enough attention to his personal appearance, but never failed to acknowledge his "professional excellence".
George Mackinolty