The aeronautical industry continuously strives to enhance efficiency by reducing weight and drag. To achieve this, lightweight materials and innovative construction methods have been employed, developing highly flexible structures. However, traditional computational methods used for rigid or low-flexibility structures are inadequate for analyzing the dynamic behavior of these flexible systems due to their inability to account for geometric nonlinearities and large deflections. The Multibody System (MBS) approach presents a promising solution for studying the nonlinear dynamics of highly flexible structures in aircraft. By dividing the structure into discrete components and simplifying the solution, MBS captures both linear and macro nonlinear behavior, making it suitable for simulating large-scale mechanical systems. In this study, we focus on modeling a highly flexible beam-like wing using an MBS approach. The structural model incorporates two flexible degrees of freedom (bending and torsion) and a central node with rigid-body degrees of freedom to account for the influence of large displacements on the rigid dynamic behavior. An aerodynamic model based on strip theory is employed, and flight dynamics is analyzed. This proposed model offers a simplified approach for analyzing flexible structures’ complex dynamic behavior and could eventually be used in model reduction techniques and nonlinear control.