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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.
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.
Amazon FBA in the United States limits the number of products to be warehoused according to the sales volume.
Then、 it will save a lot of costs to fill at least one container at a time.
At this time、 the most necessary is the American overseas warehouse.
Therefore、 the most obvious cost savings are transportation fees (including customs duties、 AMS、 IFS declaration fees、 BOND fees、 importer agency fees、 etc.).
And the recent trip to the United States has been delayed.
So now it has become a necessary choice for Amazon sellers and overseas warehouses








