1236 Air bases and air- ports. Regulations by joint Aviation Board. Erection of aerial lines, etc., restriction. Removal of existing lines. Passing of imported articles to other terri- tory of Panama. Use of Panamanian products. Lands comprising sites. Acquisition, use, ard rental of private lands. Payment by U. S . of rental for public landls. Certain lands in Corregimiento of Rio Hato. INTERNATIONAL AGREEMENTS OTHER THAN TREATIES [57 STAT. ARTICLE X. The Government of the United States of America, when construct- ing the air bases and airports on any of the sites referred to in Article I, shall take into consideration, in addition to the requirements of a technical order for the safety thereof, the regulations on the matter as have been or may be promulgated by the joint Aviation Board. The Republic of Panama shall not permit, without reaching an agreement with the United States, the erection or maintenance of any aerial lines or other obstructions which may constitute a danger for persons flying in the vicinity of the areas intended for air bases or airports. If, in constructing the said air bases and airports, it should be necessary to remove lines of wire already strung because of their constituting an obstacle thereto, the Government of the United States shall pay the costs of the removal and new installation elsewhere which may be occasioned. ARTICLE XI. The Government of the United States agrees to take all appropriate measures to prevent articles imported for consumption within the areas referred to in Article I from passing to any other territory of the rest of the Republic except upon compliance with Panamanian fiscal laws. Whenever it is possible, the provisioning and equipping of the bases and their personnel will be done with products, articles and foodstuffs coming from the Republic of Panama, provided they are available at reasonable prices. ARTICLE XII. The sites referred to in Article I consist both of lands belonging to the Government of the Republic of Panama and of privately owned lands. In the case of the private lands, which the Government of Panama shall acquire from the owners and the temporary use of which shall be granted by it to the Government of the United States, it is agreed that the Government of the United States will pay to the Govern- ment of Panama an annual rental of fifty balboas or dollars per hectare for all such lands covered by this Agreement, the Government of Panama assuming all costs of expropriation as well as indemnities and reimbursements for buildings, cultivations, installations or im- provements which may exist within the sites chosen. In the case of the public lands the Government of the United States will pay to the Government of Panama an annual rental of one balboa or dollar for all such lands covered by this Agreement. There are expressly excepted the lands situated in the Corregimiento of Rio Hato, designated by No. 12 in the attached Memorandum, it being understood that for this entire tract the United States Govern- ment will pay to the Government of Panama an annual rental of ten thousand balboas or dollars. The rentals set out in this Article shall be paid in balboas as defined by the Agreement embodied in the exchange of notes dated March 2,
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