The invention relates to a device for fastening an in-fill panel element to a plane panel element of a covering for an aircraft, the in-fill panel element and the panel element being releasably interconnected at longitudinal sides facing each other, a transverse pin being arranged at least in the end portion of a longitudinal side so that a hook element arranged in the corresponding end portion of the other longitudinal side is able to clampingly engage with a hook opening, in such a manner that a covering surface of the in-fill panel element is arranged so as to be even with a covering surface of the panel element.