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In an arrangement of the character described, the combination with a main wing lying on one side of the fuselage, of a pair of rear Haps associated in laterally juxta‐posed relationship with the trailing edge of said main wing, a forwardly disposed wing portion extending longitudinally of the main wing from a point adjacent its outer end, along a substantial portion of its length and forming a slot between the upper and lower surfaces thereof, said slot extending well along the wing expanse covered by both flaps, a passage within the wing substantially coextensive and parallel with said slot, a separate opening from said passage through the wing surface adjacent each respective flap, and means within the wing for exhausting air through one of said openings and discharging it through the other.