Arrangement for reducing the noise of an addition of wings (1; 11) of an aircraft, which on a main wing (2) and linked with release of a gap area (9) between the main wing (2) and the addition of wings (1; 11) can be extended, wherein a separating surface (6; 7) is provided which, when the addition of wings (1; 11) into the gap area (9) is displaceable and at least partially along a separating current line (13) between a vortex flow field (12) and a gap flow (10) of the, in the region of the gap (9) between the addition of wings (1; 11) and the main wing (2) extends air flowing, characterized in thatthe separating surface (6; 7) is a rigid or flexible sheet material, which is capable of a number n (n = 1 or 2) to assume of stable states;the interface (6; 7) in their respective stable state without actuator action or without the effect of setting forces remains;the interface (6; 7) by actuating an actuating device (3; 3a, 3b; 4;..
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