The design and application of adaptive winglets to enhance modern aircraft's aerodynamic performance and fuel economy is examined in this thesis. More effective aerodynamic solutions are required due to the aviation industry's growing push to lower carbon emissions and operating costs. Traditional winglets reduce induced drag mostly when cruising and offer a static performance boost. Their fixed nature, however, restricts their capacity to adjust to different flying situations. Adaptive winglets are something which can modify their design in retort to current flight conditions, which were created to overcome this obstacle and maximize aerodynamic performance during takeoff, cruise, and landing, among other flight phases. The Airbus A350's adaptive winglets were 3D modeled using Autodesk Inventor, and a hinge mechanism that allows them to move according to flight conditions was developed. The Moog Model 965 electromechanical servo actuator and an electrohydraulic actuator are combined to provide a dual actuation system that allowed for precise and synchronized winglet modifications. To analyze the lift, drag, and fuel economy of various winglet shapes, aerodynamic analysis was conducted using MATLAB. The data indicated that adaptive winglets significantly reduced drag during cruising and increased lift during takeoff resulting in fuel savings of up to 8.5% when compared to standard fixed winglets. Furthermore, adaptive winglets reduced structural stresses, extending component life and reducing maintenance expenses. They reduce vibrations caused by turbulence, increasing aircraft stability and passenger’s comfort. The study's findings suggest that adaptable winglets can significantly change the development of air transport in the future by improving environmental impact reduction and sustainability.