Air transport [air transport; airfreight; airlift; air transportation] is also called air transportation. Generally, the goods are urgently needed. If the road transportation cannot meet the time limit required by the customer, the customer will choose air transportation. Air freight has won a considerable market with its fast, safe, punctual and ultra-high efficiency, greatly shortening the delivery time, and has played a great role in accelerating the capital turnover and circulation of the logistics supply chain.

As railway transportation is less affected by climate and natural conditions, and has a large transportation capacity and a large load of single vehicles, it has advantages in the frequent and low-cost transportation. In addition, there are many types of vehicles, so that it can carry almost any Commodities can hardly be restricted by weight and volume, which are unmatched by road and air transportation.

Ocean transportation is one of the most important transportation methods in the international exchange of goods, and the proportion of cargo transportation in the total international cargo transportation is about 80%. It uses natural ocean passages, and the tonnage of ships is generally not limited, and it has the advantages of large transportation volume and low cost. However, shipping is restricted by geographical conditions and sometimes affected by seasons.