Article 14
In accordance with the requirements of Articles 15 and 16, the charging scheme for air navigation services shall contribute to greater transparency in the determination, imposition and enforcement of charges to airspace users and shall contribute to the cost efficiency of providing air navigation services and to efficiency of flights, while maintaining an optimum safety level. This scheme shall also be consistent with Article 15 of the 1944 Chicago Convention on International Civil Aviation and with Eurocontrol's charging system for en-route charges.