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In this study, six certificates have proposed and three of them used by airport terminal building to analyze, measure, and score environmental damage were compared. Certifications handled in the study are LEED (Leadership in Energy and Environmental Design), BREEAM (Building Research Establishment Environmental Assessment Method), CASBEE (Comprehensive Assessment for Building Environmental Efficiency), SBTool (Sustainable Building Tool), ACA (Airport Carbon Accreditation) and Green Airport and Green Company certificates. As a result, this research gathered the most widely used certificates in the literature. In addition, the Green Airport and Green Company certificate, the first green airport certificate in Turkiye, was added to the study for comparison, which has been offered just for airports. Hong Kong International Airport's sustainability report was examined to determine how many points it would have received if it had applied for the most widely used LEED, BREEAM, and Green Airport and Green Company Certificates regarding the reported activities. The results have shown that the energy and atmosphere category is vital for all certification systems. Also, the study reveals that LEED gets 89.09 over 100 points, BREEAM 93.1 over 100 points, and Green Airport 75 over 100 points which display BREEAM to get a higher environmental response. This study aims to guide green building practices to decision-makers, which has become necessary in many countries. Employees and managers want to know the quality and quantity of sustainable tasks or planning at airports. [ABSTRACT FROM AUTHOR]