Airframe integration is a multidisciplinary research concept and design methodology focused on the synergistic interaction and physical incorporation of aircraft components, notably propulsion systems, within the primary airframe structure. It investigates the complex aerodynamic, structural, and performance coupling effects arising from the spatial arrangement, shape, and functional interplay of these systems with the airframe. Key characteristics include optimizing component placement and configuration to maximize overall aircraft efficiency, performance, and safety, a challenge that escalates with increasing component size or novelty. Its significance lies in enabling advanced aircraft designs, improving aerodynamic benefits, and reducing energy consumption.