ICRC databases on international humanitarian law
Treaties and Documents
1949 Conventions and Additional Protocols, and their Commentaries
Historical Treaties and Documents
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.