NONE 20260316070952370 wseas/wseas content-registration-form+ja@crossref.org content-registration-form WSEAS TRANSACTIONS ON ENVIRONMENT AND DEVELOPMENT 1790-5079 2224-3496 Mohammad D. Al-Tahat Department of Industrial Engineering University of Jordan Amman 11942 JORDAN Yazan M. Y. Al-Zain Department of Industrial Engineering University of Jordan Amman 11942 JORDAN Mohammad N. S. Aladaileh Department of Industrial Engineering University of Jordan Amman 11942 JORDAN Transport fleets in transportation and distribution networks strive to maintain service quality, operational efficiency, and effectiveness in terms of service reliability, cost and time-vital objectives for these companies. Consequently, a case study covering a five-year operational period was conducted to investigate the reliability, maintainability, and availability of vehicles comprising the fleet of a major Jordanian transport company (JTC1). Breakdowns (1380) experienced by the company’s fleet of 23 operational vehicles were monitored. The methodology focused on analyzing them and collecting data, aiming for improvement through better maintenance management and planning. Data were modeled and analyzed using MINITAB software. Results showed that the Johnson transformation yielded the lowest Anderson-Darling statistics (0.350 – 0.621), respectively, and high p-values (0.467 and 0.104). Therefore, it was the most suitable distribution for the data. Data analysis was continued, and reliability and maintainability were analyzed. The average availability level was 36%, indicating promising potential for improvement. A correlation was observed between the fleet’s reliability pattern and the company’s maintenance practices. 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