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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.

The first step of Amazon refers to the process of the seller's delivery from the factory to the Amazon warehouse、 including customs clearance/pre payment of duties and other services.

The cost of the first journey includes freight+tariff. Now the first journey is mainly through express delivery/air transportation+delivery/sea transportation+delivery/railway+delivery. Most of the first journey is through customs clearance+delivery+tariff. Different products have different tariffs and surcharges. The first journey cost varies according to the weight

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.