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Synthetic fiber (synthetics) is a kind of chemical fiber, which is a general term for chemical fibers made from synthetic polymer compounds. It uses small molecular organic compounds as raw materials, and is a linear organic polymer compound synthesized by polyaddition reaction or polycondensation reaction, such as polyacrylonitrile, polyester, polyamide, etc. It can be seen from the classification of fibers that it belongs to a category of chemical fibers.

Logistics special lines、 direct transportation from one place to another without transit、 and general special line logistics enterprises will operate a number of special lines. Special lines have the advantages of fast time and high efficiency. Todropshipping supply chain integrates multiple global dedicated lines and door-to-door dedicated lines with high cost performance.

Air freight price calculation method:

（1） Air freight charge weight

According to the provisions of the airline、 when the cargo is small and heavy、 it shall be calculated according to the actual weight; In case of large volume and small weight of goods、 it shall be calculated by volume. A batch of goods consists of several different goods、 including light goods and heavy goods. The billing weight shall be the total gross weight or total volume weight of the whole batch of goods、 whichever is higher.

（2） Air freight price calculation and cost category

1. Rates;

2. TRANSPORTATIONCHARGES;

3. The airlines charge the international air freight according to the three regional rates set by the International Air Transport Association;

4. There are four main types of air freight: (1) general freight; (2) Freight rate of special goods or designated goods; (3) Class freight rate of goods; (4) Freight rate of container cargo

（3） Minimum freight

The minimum freight that the airline can accept for handling a batch of goods、 regardless of the weight or volume of the goods、 and the minimum amount that should be charged for transporting a batch of goods between two points. Different regions have different minimum freight rates.

（4） Other provisions on air freight price calculation

All the different air freight rates and charges have the following common points: the freight rate refers to the transfer from one airport to another. It is only applicable to a single direction; Other additional costs are not included. Such as picking up、 customs declaration、 delivery and warehousing expenses. Freight rates are usually published in local currency. Freight rates are generally calculated in kilograms or pounds. The freight rate in the air waybill is based on the applicable freight rate on the date when the air waybill is issued.

It takes about 4-6 days to get to the United States from Shenzhen Air Express Line、 and then it takes about 3 days to get to Amazon warehouse in the United States. Generally、 it takes about 7-9 days.