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Rules concerning the Control of Wireless Telegraphy in Time of War and Air Warfare. Drafted by a Commission of Jurists at the Hague, December 1922 - February 1923.
Part II: Rules of Air Warfare#Chapter I: Domain of application: classification and marks. - Art. 1.
Article 1. The rules of air warfare apply to all aircraft, whether lighter or heavier than air, without discriminating whether or not they are capable of floating on water.