An air route certificate is valid for ten years. One month prior to its expiration, civil air transport enterprise shall submit application (attachment 3) for CAA to complete flight and mechanical checks before issuing a renewal air route certificate. However, where there are treaties, agreements with specific rulings concluded on the basis of reciprocal principles, the provision shall not apply. An air route certificate will document only one air route, with notation on points of departure, transit and destination, nature of operation, time limit of flight and type of aircraft in use. Any change in the type of aircraft related in the above paragraph, shall necessitate application for CAA to complete flight and mechanical checks for a new air route certificate.Attachment 3 Civil Air Transport Enterprise Air Route Application.pdf