INTERNATIONAL AGREEMENTS OTHER THAN TREATIES [62 STAT. Specialcases. 2. Statistics concerning services which do not operate during the regular statistical periods are prepared after agreement between the Administrations concerned. Classservices. 3. As concerns services of class B, the Administration charged with the transportation by air has the option of requesting that the settlement of accounts be made monthly or quarterly, on the basis of the gross weight of the dispatches, or the net weight increased by 10 percent of the articles in open mail, actually transported during the period in question. In such a case, the provisions of Articles 19, 21 and 22 hereafter are applied to the ascertainment of weight and prep- aration of accounts, with the understanding that the statements Ate, p. 3295. A V 3 and A V 4 are to be made up monthly for all air transportation effected, taking account of the date of dispatch indicated by the office of origin. ARTICLE 18. Preparation of ordinary or air-mail dispatches during the statistical periodsfor air-mail transportationcharges. Ante, p . 3381. The provisions of Article 153 of the Regulations of Execution of the Convention do not apply to the semiannual statistics for the fixing of air-transportation charges. However, during such statistical periods, the labels or addresses of dispatches containing air-mail correspondence shall bear the conspicuous notation Statistigue-avion (air-mail statis- tics). ARTICLE 19. Fixing the weight of air-mail dispatches and correspondence. diate andweight in- 1. During the statistical periods, the date of dispatch, the gross weight and the number of the mail are indicated on the label or outside address of the dispatch. The inclusion of air-mail dispatches in another dispatch of the same kind is prohibited. 2. If the letters and post cards, as well as the other articles, are combined in a dispatch carried by routes for which a reduced trans- portation charge is applied to A. 0., the weight of each of the two classes must be shown in addition to the total weight on the label or outer address of the dispatch. In such case, the weight of the outer wrap- ping (sack or package) is added to the weight of the other articles. If a collector sack is used, its weight is ignored. Redispatched mail. 3. In the event that open-mail correspondence intended to be redis- patched by the air route is included in an ordinary or air-mail dis- patch, such correspondence, made up into a special bundle labeled Paravion (by air mail), is accompanied by bills conforming to Form Ant, p. 324. A V 2 hereto appended, one for the ordinary articles and another for the registered articles. The weight of the correspondence in transit in open mail is indicated separately for each country of destination or for groups of countries for which the transportation charges are uniform. In relations between countries which have agreed not to collect any payment for redispatch by their domestic air service, the weight of the articles in open mail for the country of destination itself is not indicated. The letter bill is marked "Bordereau A V 2". 3410
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