4140 INTERNATIONAL AGREEMENTS OTHER THAN TREATIES [61 STAT. 2 - to the requirements of through airline operation, and 3 - to the traffic requirements of the area through which the airline passes after taking account of local and regional services. SECTION VI. Change ofgauge. It is agreed between the Contracting Parties that, whe re the onward carriage of traffic by an aircraft of different size from that employed on the earlier stage of the same route (hereinafter refer red to as "change of gauge") is justified by reason of economy of opera tion,and where such change of gauge is to be made at a point in the ter ritory of the United States of America or the United States of Brazil, the smaller aircraft will operate only in connection with the larger air craft arriving at the point of change, so as to provide a connection ser vice which will thus normally wait on the arrivalof the larger aircraft, for the primary purpose of carrying onward those passengers who have tra Talled to the United Statesof America or the United States of Brazil in the larger aircraft to their ultimate destination in thesaaller aircraft. It is likewise understood that the capacity of the smaller aircraft shall be determined with primary reference to the traffic travellingin the lar ger aircraft normally requiring to be carried onward. Where there are va canciea in the smaller aircraft such vacancies may be filled with passen gers from the United States of America or the United States of Brazil res peotively without prejudice to the local traffic, exclusive of cabotage. SICTION VII. atS a) The determination of rates in accordance with the follow ing paragraphs shall be made at reasonable levels, due regard being paid to all relevant factors, such as cost of operation, reasonable profit, and the ratee charged by any other carriers, as well as the charaoteris-
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