62 STAT.] MULTILATERAI-UNIVERSAL POSTAL UNION-JULY 5, 1947 Transit countries have the option of requesting the use of special bills A V 2 showing the most important countries and air lines in a fixed order. When the accounts for the air transport charges are not prepared on the basis of the statistical statements (services of class B, exceptional circumstances), the bills A V 2 shall be numbered specially in a continuous annual series. 4. The entries are verified by the exchange office of destination. If that office finds that the actual weight of the dispatches differs by more than 100 grams, and that of the open mail articles by more than 20 grams, from the weight announced, it corrects the label or the bill A V 2 and immediately reports the error to the dispatching exchange office by bulletin of verification. When it is a question of closed mails, a copy of the bulletin is addressed to each intermediate Administra- tion. If the differences in weight detected remain within the limits above mentioned, the entries of the dispatching office are considered valid. 5. The absence of bill A V 2 does not authorize the transit country to redispatch the air-mail articles by surface means. Retransmission by air must be assured. If necessary, the bill A V 2 is prepared and the irregularity is reported by a bulletin C 14 drawn against the office of origin. ARTICLE 20. List of closed air mails. As soon as possible, and in any case within a period of one month after each statistical period, the Administrations which have dis- patched closed air mails send a list of such dispatches, on an appro- priate Form C 18, to the different Administrations whose air services they have used, including that of destination, if occasion arises. ARTICLE 21. Account of air-transportationcharges settled on the basis of statistics. 1. During the statistical periods, the intermediate Administrations take note, on a form conforming to Form A V 3 hereto appended, of the weights indicated on the labels or outside addresses of the air-mail dispatches which they have forwarded by the air route, either within the limits of their domestic network or beyond the frontiers of their countries. As concerns air-mail articles in open mail which reach them from other Administrations and which they forward by air, a statement conforming to Form A V 4 hereto appended is prepared in accordance with the indications appearing on the bills A V 2. Air- mail articles contained in ordinary dispatches are subjected to the same procedure. Separate statements are prepared for each dispatch- ing exchange office of air dispatches or air-mail articles in open mail. 2. The Administrations of destination which assure the forwarding of air dispatches or of air-mail articles by air in their domestic services proceed in the same manner. 3. As soon as possible, and at the latest three weeks after the close of statistical operations, the statements A V 3 and A V 4 are sent in 68706-52 -PT. ill 51 Ante, p. 3295. Ante, p. 3296. Ante, p. 3294. Forwarding ofstate- ments. 3411 Verification. Ante, p. 3266. Ante, p. 3270.
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