The Royal Canadian Air Force existed from 1924 to 1968, later designated Canadian Forces Air Command under the Canadian Forces, and then renamed to its original historic name of Royal Canadian Air Force in 2011. These are the squadrons that have served with Canada's air force since 1924.
Early squadrons
These early squadron numbers have a history going back to the post-First World War Canadian Air Force which disbanded in 1920. These units were formed after the creation of the RCAF in 1924.
During the Second World War, the British Commonwealth Air Training Plan set out co-operation between the various British Commonwealth air forces. Under Article XV of the BCATP, RCAF squadrons were attached to and/or formed within British RAF operational formations. These squadrons were known as 'Article XV squadrons'. To avoid confusion with squadron numbers of other Commonwealth squadrons, RCAF units were assigned squadron numbers from 400-449. Not all squadrons up No. 449 were formed, however. This squadron series continued through the post-war years, and the majority of current Royal Canadian Air Force operational squadrons are still numbered in the 400s due to their legacy as wartime units. For this historical reason current squadrons are listed here with their original RCAF names.
During the Second World War pilots who served in the 600-series RCAF squadrons were recruited from the Royal Canadian Artillery in England and Italy, and trained to fly at 22 E.F.T.S. Cambridge, completing their operational flying training at 43 O.T.U.. Observers were trained at Larkhill ; these were selected 'Other Ranks' from the Royal Canadian Air Force and Royal Canadian Artillery. The three Canadian 'Air Observation Post' squadrons operated under the command of 70 Group, RAF Fighter Command; the first two squadrons saw action while serving with 84 Group, Second Tactical Air Force.
No. 664 Squadron RCAF
No. 665 Squadron RCAF
No. 666 Squadron RCAF
Post-war squadrons
Subsequent to the Second World War the RCAF expanded their squadron numbers to include 444-450. No. 450 was also a Royal Australian Air Force squadron during the war and the Canadian squadron duplicated the number by error, which was discovered when No. 450 Squadron RCAF was formed in 1968.
103 Search and Rescue Squadron - This unit was operational in the RCAF from 1947–1968. Initially as 103 Search and Rescue Flight it was renamed as 103 Rescue Unit in 1950 and remained active until 1968. It was reactivated in 1977 by the Canadian Forces and redesignated a squadron in 1997.
107 Rescue Unit - formerly a detachment of 103 Search and Rescue Squadron was created in 1954 and remained there until the RCAF left and transferred it back to Transport Canada as civilian airport St. John's International Airport.
