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Convention (I) for the Amelioration of the Condition of the Wounded and Sick in Armed Forces in the Field. Geneva, 12 August 1949.
Flight over neutral countries. Landing of wounded and sick
Subject to the provisions of the second paragraph, medical aircraft of Parties to the conflict may fly over the territory of neutral Powers, land on it in case of necessity, or use it as a port of call. They shall give the neutral Powers previous notice of their passage over the said territory and obey all summons to alight, on land or water. They will be immune from attack only when flying on routes, at heights and at times specifically agreed upon between the Parties to the conflict and the neutral Power concerned.
The neutral Powers may, however, place conditions or restrictions on the passage or landing of medical aircraft on their territory. Such possible conditions or restrictions shall be applied equally to all Parties to the conflict.
Unless agreed otherwise between the neutral Power and the Parties to the conflict, the wounded and sick who are disembarked, with the consent of the local authorities, on neutral territory by medical aircraft, shall be detained by the neutral Power, where so required by international law, in such a manner that they cannot again take part in operations of war. The cost of their accommodation and internment shall be borne by the Power on which they depend.
Commentary of 1952