Identification of a Consensus in a Multicriteria Decision Process involving several Decision-Makers

Despite the continuing Covid crisis, Air Traffic Management (ATM) in Europe faced again during summer 2021 capacity constraints. Multiple airlines are affected by delays and requests for cancellations to help the ATM stakeholders managing together the major disruptions. In such a context, each airline is trying to optimise its own operations to reduce the impact. However, many airlines are belonging to a same group, and putting their resources together to face the disruption with flexibility could greatly improve their operations and propose better travel solutions to the final customers of European ATM: the passengers. In this article, we suppose that a group of airlines optimise together their operations to reduce the disruption impact and we focus on proposing an approach involving each participant in the final decision to identify a compromise among optimal solutions for the group. Based on social vote theories, a two-step approach is suggested to enable the group reaching a consensus among the proposed optimal solutions while ensuring participants acceptance of the chosen solution.