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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.
FBA headline by sea voyage is cheaper、 but it is relatively slow and cost-effective for large cargoes.
However、 if it is a small package、 air transportation may be more cost-effective and efficient.
The specific requirements shall be selected according to the products you transport and the time limit、 which is the most cost-effective
