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In an aircraft providing a finite slipstream at each side thereof, upper and lower wings having cavities and trailing edge apertures communicating with the respective cavities, flaps movably connected to the wings, the flaps when fully retracted closing the apertures and when deflected downward exposing the apertures to the atmosphere, blower means, and ducting leading from the blower means rearward to the apertures, whereby, when the flaps are deflected downward, the blower means may move air through the apertures to attenuate turbulence at the trailing edges, the wings being negatively staggered to such an extent that the slipstream directed downward by the upper flap will not interfere with the lower slipstream.