Treaties, States Parties and Commentaries
Treaties and Documents
Geneva Conventions of 1949 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 IV: Hostilities#Espionage. - Art. 27.
Art. 27. An individual, found on board a belligerent or neutral aircraft, can be considered as a spy only when, during a flight acting clandestinely or on false pretences, he obtains or endeavours to obtain information within the belligerent jurisdiction or in the zone of operations of a belligerent, with the intention of communicating it to the hostile party.