Recently, the concept of Smart Airports has become a significant topic in the aviation industry. Smart Airports apply ICT technologies such as AI, robotics, IoT, and big data to enhance operational efficiency and provide a convenient and safe airport experience. Incheon Airport is adopting these smart technologies to strengthen its competitiveness and has declared 2024 as the inaugural year of its digital transformation. In particular, the smartization of the security screening process has emerged as a critical issue, leading Incheon Airport to pursue the implementation of WT (Walk Through) smart security screening technology. This technology can double the airport's capacity by improving passenger convenience, security, and operational efficiency. This study aims to analyze the impact of introducing WT smart security screening technology on increasing airport capacity and economic benefits.