What is the main mode of transportation now?

Air transport; Air transport; Air transport; Air transport is a mode of transport with aircraft or other aircraft as the carrier. Also called air transportation. Generally speaking, when goods are in urgent need and road transportation cannot meet the time limit required by customers, customers will choose air transportation. Air transportation is fast and safe. On-time super-efficiency has won considerable market, greatly shortened delivery time, and greatly promoted the logistics supply chain to speed up capital turnover and circulation. Major airlines have invested a large number of flights to share the cake of freight. However, the cost of air transportation is higher than that of sea transportation. Highway is a road built in accordance with national technical standards to connect cities, villages, villages and industrial and mining bases, and has been accepted by the competent department of highway. But it does not include fields or natural paths in rural areas. Roads that are mainly used by automobiles and have certain technical standards and facilities are called expressways. "Highway" in Chinese is a modern expression, which did not exist in ancient Chinese. "Expressway" is named after its public transportation road.