The aviation sector is experiencing rapid development, requiring engineers to address increasingly complex challenges in designing future aircraft. The goal is no longer limited to achieving safe and fast flight; it also includes reducing fuel consumption, lowering carbon emissions, improving operational efficiency, and developing more sustainable aircraft capable of adapting to modern requirements. One of the most significant challenges is selecting suitable materials for aircraft structures. Engineers seek to use lightweight, high-strength materials, such as carbon-fiber-reinforced composites and advanced aluminum alloys. Reducing aircraft weight helps decrease energy consumption and improve performance. However, these materials require advanced manufacturing, inspection, and maintenance techniques to ensure their resistance to loads, vibrations, and temperature variations under different flight conditions. The development of propulsion systems is another major challenge in designing future aircraft, particularly because of the need to reduce dependence on conventional fuels and minimize environmental impacts. Research is therefore moving toward electric and hybrid aircraft, the use of sustainable aviation fuel, and the development of more efficient engines. Nevertheless, several obstacles remain, including battery weight, energy density, flight range, and the availability of infrastructure required to support these new technologies. Digital technologies and artificial intelligence are also playing an increasingly important role in advancing aircraft design. Computer simulations and computational fluid dynamics (CFD) enable engineers to analyze airflow around wings and aircraft structures before constructing physical prototypes. These tools also help optimize aerodynamic shapes, reduce air resistance, and predict component behavior under different operating conditions. However, reliance on intelligent systems requires rigorous testing to verify their reliability, cybersecurity, and ability to respond appropriately to emergency situations. Another challenge is achieving a balance between safety, performance, and cost. Future aircraft must withstand harsh operating conditions, including high and low temperatures and varying mechanical stresses, while maintaining high levels of reliability. This requires the development of advanced monitoring systems, comprehensive testing, and compliance with international aviation standards, in addition to reducing manufacturing and maintenance costs without compromising aircraft safety. The design of future aircraft depends on the integration of materials science, aerodynamics, propulsion systems, electronics, and artificial intelligence. Despite the numerous challenges, continued scientific research and cooperation between universities and industrial organizations can contribute to the development of more efficient, safer, and more sustainable aircraft capable of meeting the future demands of air transportation. Assist. Lecturer Al-Buraq Haider Mohsen