Relationship of international law and municipal law — Treaties — Aid to interpretation of national legislation — When recourse to treaty permissible — Requirement of ambiguity in national legislation

Air — Airports — Operation of — Landing rights — Chicago Convention on International Civil Aviation, 1944 — Whether conferring upon airlines of one Contracting State the right to land at an airport in another Contracting State — Fees payable for landing — Whether Convention confers right to land notwithstanding non-payment of fees — The law of England