Abstract: The invention relates to a window unit W for aircraft cabins, comprising an outer window frame 1, an inner window frame 3, a window pane 2 lying between them, and possibly having a sun-visor 4, a roller blind 34 or the like arranged between the inner window frame 3 and a possible covering frame 5, the window unit W being insertable into the opening 7 in a side-wall panel 6 or the like in the aircraft cabin. In order to make it possible for the window unit W to be rapidly and simply installed and removed, the invention makes provision for the window unit W to have a centering device and at least two snap fastenings 13, advantageously with locking devices, to detachably connect it to the side-wall panel 6, or to components connected thereto, the side-wall panel 6, or components connected thereto, having any necessary mating parts for the centering device for the snap fastenings 13.