The first Single European Sky (SES) legislative package was adopted in 2004 in order to improve safety and efficiency of air transport in Europe and foster the restructuring of European airspace and air navigation services. It provided the framework for the creation of additional capacity and for improved efficiency and interoperability of ATM systems in Europe.
The Single European Sky has already delivered a number of achievements identified in the first report on the progress of Single European Sky implementation: safety has been strengthened, safety oversight is separated from service provision, EUROCONTROL Safety Regulatory Requirements (ESARRs) have become Community law. Going beyond interoperability rules, the SESAR project was launched as the technological and industrial component of the Single European Sky.