No. 4 Squadron was a Royal Canadian Air Force squadron that was active before and during the Second World War. It was formed on 17 January 1933 at RCAF Station Jericho Beach and flew civil operations
Canadian Vickers Vancouver
…Vancouver IIS/W – "service standard" conversion of two Wright J-6 Whirlwind powered Vancouver IIs. No. 4 Squadron RCAF 1939-1940 Data from Canadian aircraft since 1909, Jane's all the World's Aircraft 1931…
A Fairchild F.71B that was operated by 4 Squadron for coastal patrols in the late 1930s