The One ATM System joint undertaking is a technical and commercial initiative to renew and replace the ANSPs’ current ATM systems in phases between 2007 and 2012. In its efforts, it aims to maximise the benefits for the stakeholders, especially for the airspace users, by minimising life-cycle costs for the system and the services by following the Single European Sky principles and by striving to achieve the targets of harmonisation and integration.

The current One ATM System members need to acquire, install and operate a new ATM system by 2012 at the latest. The One ATM System will provide regional IT services to the members based on a cluster architecture. The members will provide the operational ATS based on the One ATM System services. This approach maximises the safety benefits and minimises the life-cycle costs due to the joint specification, procurement, implementation, integration, evolution, operation and maintenance of the services in a harmonised environment. The joining of forces will also strengthen their position towards industrial suppliers and influence the development of standardised tools taking their operational needs into account.

The advantage of our approach was confirmed by the One ATM System business case produced by Booze Allen Hamilton at the end of 2004 and is to be further elaborated in the course of the project's present definition phase.