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This study examines the correlation between market culture and the dimensions of sustainability performance—economic, environmental, and social—within African Civil Aviation Authorities (ACAAs), while also exploring the mediating influence of corporate governance. A quantitative, cross-sectional methodology was utilised, incorporating data from 371 managers across 54 ACAAs. Data were evaluated with Partial Least Squares Structural Equation Modelling (PLS-SEM). The results indicate that market culture exerts a substantial beneficial impact on all three aspects of sustainability performance: economic, environmental, and social. Corporate governance did not act as a mediator in the interaction between market culture and economic sustainability. Furthermore, corporate governance substantially mediated the links between market culture and both environmental and social sustainability performance among ACAAs. The findings underscore the necessity of synchronising organisational culture with governance frameworks to attain holistic sustainability results in the civil aviation sector. This study advances institutional theory by highlighting the interaction between internal cultural and governance structures and institutional forces, hence improving legitimacy and performance in the civil aviation sector.