Columbia subject headings:
Aeronautics, Commercial--Canada--History.
Aeronautics, Commercial--Government policy.
Aeronautics, Commercial--History.
Harvard subject headings:
Aeronautics, Commercial--Canada--History.
Aeronautics, Commercial--History
Aeronautics, Commercial--Law and legislation
Princeton subject headings:
Aeronautics, Commercial--Canada--History.
Aeronautics, Commercial--Government policy.
Aeronautics, Commercial--History.