#3177c from the American Air Mail Catalog - First Flight Cover from Embarras Portage to Fort McMurray.  On December 17-18 Embarras Portage was added to Fort McMurray - Aklavik Route.  6368 pieces of mail were carried on this leg piloted by A.M. McMullen of Canadian Airways.  The 6c air mail rate was covered with #163 1c green and C1 5c Air Mail.

The Special Delivery rate was an extra 20c with the E4 Special Delivery stamp.