The process of parametric design is considered one of the newest trends in the architecture field that can be obviously recognized in airports' terminals design. The process of decision-making is supported during the early stage of the conceptual design process. Yet, many design alternatives are being introduced to choose the fittest design concept. During that process, the airport design depends on many parameters that should be considered before taking design decisions. Furthermore, creating the desired model is assisted by using a computerized stage for digital fabrication through several mock-ups of different fabricated scales to allow the process of design decisions. The workflow for the process of parametric design is being spotlighted in this paper for a pavilion that is designed in an airport from the conceptual design stage (with the assistance of Grasshopper “Plugin for Rhinoceros) to the fabrication stage (with the assistance of Slicer Fusion) that is used for preparing the mock-ups for the digitally fabricated process using the CNC router.