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With the complexity of the National Airspace System, a comprehensive taxonomy is needed to classify incident causal factors within the air traffic control (ATC) industry. These causal factors must not be limited to the individual involved in the incident, but must extend to the role of management and the organization. The Human Factors Analysis and Classification System (HFACS) is a human error taxonomy when integrated into the incident investigation process permits for causal factors to be classified at various system levels. Utilizing HFACS, this study investigates human performance within the ATC industry and classifies ATC incidents cases using HFACS, investigates the effects of on-the-job training, and further examines the causal factor networks present. These findings can be utilized to better understand the system-wide impacts on ATC incidents and assist in targeting mitigations towards latent conditions, which have the potential for a greater impact.