This research tackles optimization measures applied to the European ATM Network. It focuses on the Network Manager’s (NM) ability to become an active decision-making entity, strengthening its current mediation position in the relationship with relevant stakeholders (air navigation service providers - ANSPs, airspace users - AUs) inside the Collaborative Decision-Making (CDM) process. A game theoretic model, with the aim to measure the acceptance of the stakeholders to partially cede decision autonomy to the NM within the aforementioned process with the goal of improving overall ATM Network performance, is investigated and analysed.