Map of Canada and the United States showing air mail routes

Map depicting part of Canada and the majority of the United States of America. The Northernmost portion of Canada, including most of the territories, is not shown. Shows air mail routes. At bottom left corner: "Note 1. Probable date of inauguration September 1929." At bottom right corner: "Note 2. Probable date of inauguration August 1929." The notes relate to a section of the air mail route.