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In short

International express is door-to-door pickup and delivery

Sea transportation is from port to port、 from one country's port to another country's port.

The special line generally refers to the door-to-door transportation mode of Shuangqing、 similar to express delivery.

However、 air transportation is only the transportation from one airport to another、 which requires separate application for customs declaration and clearance.

In general、 small goods are more likely to choose special lines. Preferential price for large goods transported by air.

Air transport means ordinary air transport. When transporting large quantities of goods、 the general freight will be cheaper than express delivery. However、 they need to deliver the goods themselves、 declare customs and even apply for inspection. It may also inspect the goods.

Express delivery is not necessarily air transportation. If it is international transportation、 the delivery time in some places is not necessarily faster than ordinary air transportation. But usually、 there is no need for customs declaration and inspection、 and it is convenient to pick up and deliver goods at home.