Article 10
Relations between service providers 1. Air navigation service providers may avail themselves of the services of other service providers that have been certified in the Community. 2. Air navigation service providers shall formalise their working relationships by means of written agreements or equivalent legal arrangements, setting out the specific duties and functions assumed by each provider and allowing for the exchange of operational data between all service providers in so far as general air traffic is concerned. Those arrangements shall be notified to the national supervisory authority or authorities concerned. 3. In cases involving the provision of air traffic services, the approval of the Member States concerned shall be required. In cases involving the provision of meteorological services, the approval of the Member States concerned shall be required if they have designated a provider on an exclusive basis in accordance with Article 9(1).