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The rapid advancements in in-flight Wi-Fi connectivity driven by the growing demand for seamless internet access during flights and efforts to enhance passenger comfort have led airlines to adopt technologies like Starlink Wi-Fi. Integrating these systems into A320 aircraft requires a structured certification process to meet airworthiness standards. This thesis analysed the certification process for installing Starlink Wi-Fi on the A320 series under EASA and DGCA regulation, focusing on airworthiness certification and process optimization. The certification process begins with defining the general design description and classifying the modification. The certification basis and compliance requirements are then identified, outlining how applicants demonstrate conformity for installing Starlink Wi-Fi on A320 aircraft. As a result, this modification is classified as a non-significant major change and must demonstrate compliance with approximately 35 identified requirements. To enhance efficiency, the study applied the Design Structure Matrix (DSM) methodology, specifically utilizing partitioning techniques to analyse and optimize the complex sequence of activities involved in certifying and installing Starlink systems. The identified workflow consists of 79 steps across three phases including project launch, change-to-type investigation, and project closure. Process optimization using DSM methodology highlighted sequential, parallel, and interdependent activities. Most engineering activities can be conducted in parallel, with processes like threat test analyses and manual supplement development performed simultaneously. Furthermore, by assuming DGCA regulation aligns with EASA standards, the STC project for the installation of Starlink Wi-Fi on the A320 requires DOA Class C and D. Indonesian airlines can collaborate with a foreign DOA, but STC approval must be validated by an Indonesian DOA. Alternatively, airlines can work directly with an Indonesian DOA, ensuring compliance with CASR Part 21 and airworthiness requirements.