664 "Air Observation Post" Squadron RCAF was formed in England during the Second World War.

The squadron was formed on 9 December 1944, at RAF Andover, its principal role being to direct artillery fire from the air.

70 Group, RAF Fighter Command; prior to deployment to the European continent, the squadron was transferred to No.

IV and V. After V-E Day on May 8, 1945, the squadron was tasked with flying mail and passengers for First Canadian Army.

The squadron continued flying like duties for the Canadian Army Occupation Force (CAOF) until the spring of 1946.