In recent years, knowledge is considered to be a valued and important asset within an organization. However, knowledge sharing in many organizations is deemed a challenge and an obstacle to overcome. This research was prepared to explore the predecessors that influence knowledge sharing and knowledge utilization behavior. The underlying research model was developed using Social Cognitive Theory alongside with Information System Success Model. A total of 108 samples were obtained from the employees of a leading airline company in Indonesia, who use Knowledge Management System exhaustively. Data was analyzed using Partial Least Square Structural Equational Modeling, aided with SmartPLS 2.0 software. The results of this study denote that enjoyment in helping others, interpersonal trust, norm of reciprocity, top management support, and system quality, to be factors that influence knowledge sharing behavior. Finally, research results also indicate that knowledge contributing and collecting behaviors concertedly influence knowledge utilization.