Route code of the route

Air traffic control must be implemented for aircraft flying on the air route. In order to facilitate the work of drivers and air traffic control departments, traffic signs have clear names and codes. The basic route code stipulated by ICAO consists of a Latin letter and the number 1 ~ 999.

(1) Regional air traffic service routes or international routes are open routes determined according to the Asia-Pacific Navigation Plan of ICAO or determined by China. Its route direction is determined by the regional navigation meeting, and the route code is designated by the Asia-Pacific Office of ICAO, namely A, B, G and R..

(2) The regional navigation routes are also determined by the ICAO Asia-Pacific Navigation Plan, and the route codes are designated by the ICAO Asia-Pacific Office, which are L, M and N respectively. ..

(3) Domestic air traffic service routes are determined by the state and assigned codes, namely H and J. (4) Domestic regional navigation routes are determined by the state and assigned codes, namely Q (heading 180~359), Y (heading 360~ 179) and T (two-way).

(4) A Latin letter can be added before the basic code for the specified altitude range or for the flight of a specific aircraft. For example, K is used for helicopter low-altitude routes, U is used for high-altitude routes, and S is used for supersonic aircraft acceleration, deceleration and supersonic flight routes. You can also add a Latin letter after the basic code. For example, D means that the airline, airline or part of the flight segment only provides consulting services, and F means that the airline, airline or part of the flight segment only provides flight information services.