Potential NASA Commercial Applications: The most immediate opportunity for this system is to assist NASA in the development of next generation quiet aircraft, including tube and wing (current generation +1) and integrated airframe propulsion system configurations (current generation +2). On approach, these aircraft are likely to have airframe noise levels that are comparable to or in excess of the engines. A quiet air brake device will allow noise reduction by creating drag without the associated unsteady flow structures of devices such as flaps, slats, and undercarriage. In addition, these devices will enable steep approaches, thereby locating the noise source further from the affected communities. Further development of the technology could lead to advanced thrust reverser applications whereby the deployable exit guide vanes can actuate to a closed position to function as thrust reverser blocker doors. An additional application for swirling exhaust flows is in the area of wake vortex avoidance and induced drag management. For example, swirling outflow devices placed on wing tips could be used to counter- or co-swirl relative to the bound vortex that is shed by a finite wing, resulting in potential induced drag reduction or increase (possibly of value in a quiet drag sense). This may prove to have applications in designing more fuel efficient and quiet aircraft in the future.