62 STAT.] MULTILATERAL-UNIVERSAL POSTAL UNION-JULY 5, 1947 3405 That notation may appear either in a special hand-stamp impression or on a special adhesive stamp or label, or, even, it may be simply indicated on the address side of the article by any process whatever. In all cases, the notation shall be supported by the date stamp of the office of origin. ARTICLE 6. Unprepaidor insufficiently prepaid air-mail correspondence. 1. In case of total lack of prepayment, air-mail correspondence is treated in accordance with the provisions of Articles 37 and 38 of the A nt e, p. 3322 Convention. Articles whose prepayment at the time of mailing is not obligatory are sent by the ordinary means. 2. In case of insufficient prepayment, surcharged air-mail cor- respondence is sent by air when the postage paid represents at least the amount of the air-mail surcharge. The Administrations of origin have the option of sending such correspondence by air when the post- age paid represents at least 25 percent of the amount of the air surcharge. 3. The provisions of Article 38 of the Convention are applicable in regard to the collection of charges not paid at the time of mailing. 4. When surcharged articles mentioned in Section 2 are sent by ordinary means, the office of mailing or the exchange office shall cross out by means of two heavy transverse lines the Par Avion label and all notations relative to the air transportation, and indicate briefly the reason for transmission by the ordinary means. ARTICLE 7. Delivery of air-mailcorrespondence. 1. Air-mail correspondence is delivered as rapidly as possible, and shall at least be included in the first delivery following its arrival at the office of destination. 2. Senders have the option of requesting delivery at the addressee's special-rer serv- residence by special carrier immediately after arrival, by paying the special-delivery fee provided for by Article 47 of the Convention. An,p. 332. That option exists only in relations between countries which have organized the special-delivery service in their reciprocal relations. 3. When the regulations of the country of destination permit, addressees may ask the office charged with the delivery to have air- mail correspondence addressed to them delivered to them upon arrival. In that case, the Administrations of destination are authorized to collect, at the time of delivery, a special fee which may not be higher than the special-delivery fee provided for by Article 47 of the Convention. 4. For additional compensation, Administrations may, after agree- spdi mens. ment, undertake delivery at the residence of the addressee by special means; for example, by the use of pneumatic tubes.
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