How are aircraft routes delineated? What is a trunk line?

1. Routes are divided into international routes and domestic routes according to the origin and destination. Among them, domestic routes can be divided into trunk routes and feeder routes.

2. Trunk routes refer to routes connecting Beijing with the capitals of provincial capitals, municipalities directly under the Central Government or autonomous regions, or cities belonging to provinces and autonomous regions, such as Beijing-Shanghai routes, Shanghai-Nanjing routes and Qingdao-Shenzhen routes.

3. Regional routes refer to routes between cities in a province or autonomous region.

4. The routes used in civil aviation transportation are designated by the Air Force and approved by the State Council and the Central Military Commission, which are fixed.

5. Civil aviation usually uses airlines. The so-called air route refers to the air passage with a certain width stipulated by the state. Generally, there are relatively complete communication and navigation equipment with a width of 20KM. The purpose of route delineation is to maintain air traffic order, improve space utilization and ensure flight safety.

6. During the flight on the route, try the standard of "East Single and West Double" to make the plane at different heights. For example, the plane from Lanzhou to Beijing uses 8700 meters, and the plane from Beijing to Lanzhou on the same route uses 9000 meters. Although they overlap vertically, it is safe. The route of an airplane is like the driveway of a highway.