The field of Aerospace Engineering has witnessed remarkable technological advancement in recent years, particularly in the development of electric and hybrid aircraft propulsion systems. This transformation has emerged as a direct response to the growing global demand for environmentally sustainable transportation and the urgent need to reduce carbon emissions generated by conventional aviation systems. As the aviation industry faces increasing environmental challenges, engineers and researchers have focused on developing innovative propulsion technologies capable of improving efficiency while minimizing environmental impact. Consequently, electric and hybrid aircraft have become one of the most promising directions for the future of air transportation. Electric aircraft primarily rely on electrical energy stored in advanced battery systems to power electric motors that generate thrust. In contrast, hybrid aircraft combine electric propulsion with conventional internal combustion or turbine engines to achieve a balance between operational efficiency and flight range. The rapid evolution of lithium-based battery technologies has significantly contributed to the feasibility of these systems by increasing energy density while reducing battery size and weight, both of which are critical factors in aircraft design and performance. The transition toward electric aviation offers not only environmental advantages but also major economic and operational benefits. Electric propulsion systems contain fewer moving mechanical components compared to traditional jet engines, leading to lower maintenance requirements and reduced operational costs over time. In addition, electric motors produce substantially lower noise levels, making them highly suitable for urban environments and airports located near densely populated regions. These characteristics have encouraged aviation manufacturers and research institutions to invest heavily in sustainable propulsion technologies. Several leading aerospace companies, including Airbus and Boeing, have launched advanced projects focused on the development of electric and hybrid aircraft. At the same time, many emerging startups are introducing innovative solutions for urban air mobility and electrically powered vertical takeoff and landing aircraft. These projects aim to create highly efficient aircraft capable of performing short- and medium-range flights with significantly lower environmental impact compared to conventional aircraft. Despite these advancements, several technical challenges continue to limit the widespread adoption of electric aviation technologies. One of the primary obstacles is the relatively high weight of batteries compared to the amount of energy they can store. This issue directly affects aircraft range, payload capacity, and overall flight performance. Furthermore, electric propulsion systems face challenges related to charging speed, thermal management, energy distribution, and operational safety, especially in large commercial aircraft operating over long distances. As a result, ongoing research efforts are concentrated on developing next-generation batteries with higher energy density, lightweight structural materials, and more efficient cooling technologies. From an engineering perspective, electric and hybrid propulsion systems are reshaping conventional aircraft design philosophies. The flexibility of electric motors allows engineers to distribute propulsion units across different sections of the aircraft, including wings and fuselage structures, leading to improved aerodynamic efficiency and reduced drag. Moreover, modern electric aircraft increasingly depend on intelligent control systems and artificial intelligence algorithms to optimize power consumption, enhance flight stability, and improve overall system performance during operation. The future of aviation is clearly moving toward cleaner, smarter, and more sustainable technologies. Many researchers predict that electric and hybrid aircraft will become an essential component of global air transportation within the coming decades. This transformation is expected not only to reduce greenhouse gas emissions but also to redefine aviation economics, operational efficiency, and transportation accessibility worldwide. In light of these developments, universities and aerospace engineering institutions must actively support scientific research related to electric propulsion technologies and sustainable aviation systems. Encouraging students and researchers to engage in this rapidly evolving field will play a crucial role in advancing future aerospace innovations. The ongoing revolution in aircraft propulsion technologies represents more than a simple engineering improvement; it marks the beginning of a new era that could fundamentally reshape the future of the global aviation industry.