When the First World War broke out, little was known about aviation. Even less was known about using the biplane as a new weapon. Training Aces:  Canada’s Air Training During the First World War chronicles the development of military aviation in Canada that began in the years before the war when early flight experiments were made by the Canadians and Americans, including Alexander Graham Bell, William Wallace Gibson, John Douglas McCurdy, William McMullen, Glenn H. Curtiss, and William Straith. This book portrays the important role that Canada played in the success of the air training efforts before and during the First World War, and describes the establishment of two aviation companies in Toronto and Vancouver. The Canadian air training system played a significant role in the overall development of military aviation and had a major impact on the British Commonwealth Air Training Plan of the Second World War.