Coupled high–fidelity simulations are essential for the aircraft design process, and increasing availability of high–performance computing systems enables the use of more computationally demanding models with the same expected time to solution. Highly resolved fluid–structure interaction simulations, which are used to model the aeroelastic behaviour of an aircraft, are ideally suited for running on high–performance computers due to their computational cost. However, not every component of such pipeline scales as well as the computational fluid dynamics code. Simulation blocks that are conventionally considered inexpensive compared to the flow solver may present challenges related to long communication times and excessive memory consumption when scaling up the number of cores. This paper presents improvements to the mesh partitioner and mesh deformation methods for highly parallelized simulations of full–aircraft configurations within the FlowSimulator framework. The proposed improvements to the mesh partitioner allow for even larger and more parallelized simulations than was previously possible in the framework. Furthermore, scaling results from a mesh deformation method based on the elastic analogy are presented, which demonstrate superior scalability compared to the conventional radial basis function method. This enhances the overall suitability of the toolchain for large parallelization and highlights its potential for industrial applications. The results demonstrate a step forward in the applicability of high–performance computing systems for solving coupled simulations in the aeronautic industry.