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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 V: On Military Authority over enemy and neutral aircraft and persons on board. - Art. 31.
Art. 31. In accordance with the principles of Article 53
of the Regulations respecting the laws and customs of war on land, private neutral aircraft found by a belligerent occupying force when entering an enemy jurisdiction, may be requisitioned under payment of a full indemnity.