A revised Eurocontrol Convention was signed in 1997, renewing the organisation's optimism for greater political support, surpassing the original vision of the 1960 Convention. In June 1998, Eurocontrol, the European Space Agency (ESA) and the European Commission (EC) also signed an agreement formalising cooperation in the realm of satellite navigation systems and services. In 1999 the European Commission presented its plan for a Single European Sky (SES) to the European Parliament, followed by two high-Level groups (HLG). The HLG reports on SES led to the establishment of the European Aviation Safety Agency (EASA) and reinforced the European Commission's role as the sole European aviation safety regulator, while acknowledging Eurocontrol's technical expertise in the implementation of said regulations.
