Ground handling companies (GHCs) have the highest potential for occupational accidents in the air transportation sector. Understanding the success factors of occupational health and safety management systems (OHSMSs) implemented by GHCs ensures effective and efficient use of resources. Knowing the relative importance of success factors will enable companies to focus their energies on the most important factors. The analytic hierarchy process was used to determine the relative importance of success factors. The data of the study were obtained through a questionnaire survey of participants working as occupational safety and health (OSH) managers in GHCs operating in Turkey. According to the results of the study, the most critical success factor is ‘top management support’, followed by ‘positive safety culture’. The differentiating result of the research from the literature is that ‘OSH professionals’ ranks third as an important success factor. Other success factors include ‘OHSMS practices’, ‘stakeholder attitudes and characteristics’ and ‘regulations’.