Canadian Airways Limited Stearman 4EM Senior Speedmail, 1930s for mail delivery in Eastern Canada.

he Stearman 4EM Senior Speedmail was a single-seater, general-purpose biplane manufactured by the Stearman Aircraft Company in the US. Canadian Airways operated four 4EM mail planes, whichwas considered the fastest aircraft in Canadian skies in its era (surpassing the RCAF Siskin fighter). It was considered by some the ultimate civil biplane in North America.