The airline service industry is characterized by high levels of uncertainty and frequent non-routine situations, in which frontline employees’ voluntary and cooperative actions are critical determinants of service quality and customer experience. Although airport ground staff represent airlines at key stages of the customer journey, empirical research examining the relationship between leadership and service-related behaviors among this group remains limited. To address this gap, this study investigates the relationships among inclusive leadership, psychological safety, and prosocial service behavior among airline airport ground staff. Survey data were collected from airport ground staff employed by domestic airlines, and the proposed research model was tested using structural equation modeling. The results indicate that inclusive leadership has a significant positive effect on psychological safety. Inclusive leadership also directly and positively influences all dimensions of prosocial service behavior. In addition, psychological safety positively affects in-role behavior, extra-role behavior, and cooperative behavior. Finally, psychological safety is found to significantly mediate the relationship between inclusive leadership and prosocial service behavior. This study contributes to the literature by extending airline service leadership research beyond its traditional focus on cabin crew to include airport ground staff, while conceptualizing prosocial service behavior as a multidimensional construct. From a practical perspective, the findings suggest that airlines can enhance service competitiveness by strengthening managers’ inclusive leadership capabilities and cultivating organizational environments that foster psychological safety.