Collaborative optimization is a method used to solve complex design problems, like designing aircraft. It allows different parts of the design to be optimized at the same time, leading to better results. In this study, two aircraft design problems were solved using collaborative optimization. The first problem, involving wing design, showed that collaborative optimization leads to the best solution compared to other methods. The second problem, which was more complex, also showed that collaborative optimization works well even with more variables and constraints. Overall, collaborative optimization is a powerful tool for designing aircraft efficiently and effectively.