At present, the main sources of air transportation are

At present, the main sources of air transportation are fresh products, electronic products, business documents and precision machinery products. Air transportation is a mode of transportation that uses airplanes, helicopters and other aircraft to transport people, goods and mail. It is fast and mobile, and it is an important way of modern passenger transport, especially long-distance passenger transport. It is an indispensable tool for transporting precious fresh goods and precision instruments in international trade.