Most of the international air express companies are multinational companies. These companies extend their business to all parts of the world in the form of sole proprietorship or joint ventures and establish a global network. The transmission of air express mail is basically done within multinational companies. The international postal service has achieved cooperation between postal agencies in most countries in the world through the Universal Postal Union, and mail is delivered through the cooperation of two or more national postal authorities. International air cargo transportation mainly adopts the form of centralized consignment, or directly entrusted by the shipper to carry out the air freight forwarder. After the goods arrive at the destination, they will be transferred to the consignee through the related person of the air freight forwarder at the place of delivery. . In addition to the airlines involved in the business, it also relies on the assistance of air freight forwarders.