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The dorsal fin, as noted, is an aerodynamic extension of the tail fin on specific aviation models, notably the 737NG series. While it does not contribute structurally to the aircraft's integrity, it plays a crucial role in aerodynamics. The fin enhances the surface area, allowing for better control during flight operations, particularly in scenarios such as engine failure. In instances where one engine is producing thrust and the other is creating drag, a properly functioning dorsal fin helps maintain directional control on the ground.