The mission of the SESAR Joint Undertaking (SJU), created under Article 171 of the Treaty establishing the European Union, is to develop a modernized air traffic management system for Europe, which will prevent crippling congestion of the European sky and reduce the environmental impact of air transport. The SJU will therefore coordinate and concentrate all relevant research and development efforts undertaken by its members. The SJU is responsible for the implementation of the ATM Master Plan and for carrying out specific activities aiming at developing the new generation air traffic management system capable of ensuring the safety and fluidity of air transport worldwide over the next thirty years.