What are the modes of Amazon International Express Transportation in the United States?

Now Amazon market fire trend, corresponding to the emergence of Amazon sales, but customers have a headache for the transport of goods, such as the United States Amazon transport costs are too high, customers can not customs clearance, product packaging is not standardized lead to goods can not be scanned on shelves. So what are the modes of transportation for Amazon International Express?

What are the modes of Amazon International Express Transportation in the United States?

1、international air transport

2、sea freight

3、International Air Transport + Delivery

4、International Shipping + Delivery