Spare part availability and total cost are the focus of Supply Chain Management (SCM) in Aircraft Maintenance Company. The number of various, specific, and uncertain spare part demand create complexity in the Aircraft Maintenance Company Supply Chain. Moreover, pandemic Covid-19 exacerbates Aircraft Maintenance Company circumstances, leading to a significant drop in demand for aircraft maintenance up to 44%. This research aims to determine the target and analysis of Aircraft Maintenance Company’s supply chain business process and improvements to the supply chain process of spare parts in the Aircraft Maintenance Company. The method used in this research presents an approach that uses the Supply Chain Organizations Reference (SCOR) model performance matrix to study the Aircraft Maintenance Company supply chain in the financial and performance evaluation dimension combined with the fuzzy TOPSIS model for evaluation supply chain processes. This research results in an improvement target selection in the supply chain process to support Supply Chain Re-engineering.