Currently in use on the wings of airplanes are little fins near the leading edge or just upstream of control surfaces to help control the aircraft during takeoff or landing. But these vortex generator vanes and other similar solutions are fixed in place across the entire flight, creating a cruise penalty from the drag. A promising new idea for a device was tested at the University of Illinois that uses an electric spark that can be turned on and off when needed to generate rotating air across the wing for better lift.