BOT model is widely used in developing countries to facilitate the construction of immediately needed infrastructure projects with both technical and financial risks being borne by the private sector. BOT model differs from traditional ones because of its financial structure and operation service that is included in the concession. The aim of this research is to identify the critical success factors (CSFs) for BOT projects by examining real BOT projects, mainly airport projects. In this research, a detailed literature survey has been carried out as well as in-depth interviews with experts to identify the CSFs that are categorized in 13 groups. Based on these factors, a decision support v checklist has been developed. The checklist has the &ldquo / source&rdquo / of each CSF and the &ldquo / phase&rdquo / of the project that the CSF will have an effect. Finally two BOT projects, namely Dalaman and Aktau International Airport Projects, are studied thoroughly using the developed checklist. This research gives clear description and understanding of CSFs for airport projects which was a missing part in the construction management literature together with illustrative real cases. The findings of this research may be helpful for decision makers at the initial stages of BOT projects by providing a checklist of CSFs and demonstrating their significance in each phase of a BOT project.