Acestry.ca says the following -
“Canada did not have its own air force until late in the First World War, but 22,000 men from the Canadian Expeditionary Force (CEF) were welcomed into the growing British Royal Air Force, which was formerly known as the Royal Flying Corps.
The British Air Ministry maintained these ledgers of CEF members who transferred to the Royal Air Force. The records were later transferred to the Department of National Defence.
The records include name, address, date of birth, next of kin, the officer’s movements from unit to unit, appointments and promotions, decorations and honours, medical information, and civilian employment. Dates and notations on the ledger pages indicate records were filled out between 1918 and 1919. The activities and movements recorded in the ledgers took place between 1915 and 1919”.
To get more information, you can go to the Ancestry.ca site at http://search.ancestry.ca/search/db.aspx?dbid=9148
To get more information on the Royal Flying Corps Canada