With many factors, international shipping may seem a little complicated for some people, especially if they need to take some goods from distant destinations. In addition, those who frequently need to get goods from China to America need to look for time to check available options.
For example, if you manufacture goods in China it may mean that you have to ship those goods from one location to another. Sending over the ocean is a good idea. The cost of the ocean shipping, on the other hand, is largely determined by size. If you send large and heavy objects, the ocean is a better choice. For smaller things, the air load will be more practical.
Also, shipping from China to US time may be very important for some companies in America. In these cases it is almost necessary to hire air shipping services. They can help you get your goods if it is necessary the same day it is sent from China.
Most importantly, you have to go with a company that has a good reputation. There are some shipping companies, either air or ocean, which receive many negative feedback from many of their customers, so you have to worry about it. Try to keep away from these sources and go with those who are often praised by most users.