Model-based systems engineering (MBSE) is known to streamline complex system design by providing a unified, model-based approach to capture, analyze, and simulate system requirements, behavior, and structure throughout the development lifecycle. This study applies MBSE to the design of aircraft engine inlets, specifically integrating Systems Modeling Language (SysML) in the process. The study leverages MBSE’s systematic approach to enhance collaboration and traceability in the design process. Utilizing a structured Requirements, Functional, Logical, Physical (RFLP) process with MagicDraw and a realistic set of industry-defined requirements from Collins Aerospace, the study incorporates design constraints, regulatory requirements, and stakeholder preferences to ensure safety, reliability, and environmental compliance. The MBSE approach could provide a unified platform for communication and decision-making, mitigate risks, reduce development time and costs, and facilitate the delivery of superior propulsion systems. In a first, this study demonstrates the transformative potential of MBSE in enhancing design efficiency and fostering innovation, particularly for electric and hydrogen-powered propulsion systems.