The most important principle of aircraft route determination is to ensure the safety of aircraft flight. Generally speaking, the route is fixed, and the pilot will remember the form in advance. In addition, on the premise of ensuring safety, it also depends on the economic purpose.
Even people who have never taken a plane should know that the routes of the plane are basically fixed, and each specific route has its own name, so the driver basically remembers in advance when driving, and these routes have been repeatedly confirmed.
The aircraft route determination, from the initial visual method, to the later wireless positioning, and then to the current radar and satellite positioning, ensures that the aircraft position can be effectively detected in the ground control station and guided to the correct route.
On the premise of ensuring safety, the determination of routes also depends on some economic purposes. We found that most of these routes are mainly large cities. Routes are established between several large cities and distributed from large cities to small cities.