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Research on the dimensions of proximity draws on the measurement and the characteristics of these dimensions of proximity, although institutional proximity lacks clarity. This paper attempts to fill this gap. We propose analyzing institutional proximity through the observation of shared representations. To meet this target, we conduct a thematic content analysis. To provide a comprehensive view, we interviewed eleven aeronautical actors on their perception of this proximity. Through the analysis of their remarks, the research highlighted the components and the effects of institutional proximity on their inter-organizational relations. The study reveals a positive and a negative shared perception of the sector. This is a new finding, despite an unexpected lock-in effect coming to light.