Abstract: The invention relates to the fuselage structure of an aircraft with an outer skin (1) which is reinforced by several vertically aligned transverse ribs (7) and several horizontally aligned longitudinal ribs (8) wherein the outer skin (1) has several windows (5) which each comprise a window frame (6). In order to be able to have a free and flexible choice regarding both the size and arrangement of view or access openings in the fuselage shell it is proposed according to the invention that at least one transverse rib (7) runs through the window frame (6) of a window (5) so that the transverse rib ends in an upper section (9) of the window frame (6) and in a lower section (10) of the window frame (6).