This report examines the application of a Lean Six Sigma (LSS) framework to improve operational performance within an aircraft Maintenance, Repair, and Overhaul (MRO) facility. The study identifies issues such as late calls and service inefficiencies, which lead to increased costs and reduced quality. The research methodology employs a case study approach to analyze problems and propose solutions. The LSS framework is implemented through phases that include increasing response time, optimizing internal operations, and establishing process flow. Non-value-added analysis and Pareto diagrams are utilized to pinpoint areas of waste, like the increasing number of late calls. The report concludes that LSS provides significant benefits by minimizing waste, improving service quality, and enhancing overall operational efficiency. References include key academic papers on Lean and Six Sigma implementation within the aviation industry. The report highlights the importance of continuous improvement and provides insights into how LSS can be strategically adopted to enhance performance and customer satisfaction.