An aircraft comprising: a fuselage including a plurality of frame members disposed at predetermined intervals in a longitudinal direction of the fuselage and a plurality of stringers extending substantially linearly in the longitudinal direction, the fuselage defining an interior; a lavatory compartment located in the interior of the fuselage, the lavatory compartment including a ceiling panel and defining an interior area; a first window assembly mounted in the ceiling panel to an upper portion of the fuselage for introducing daylight downwardly into the interior area; and a second window assembly mounted in the ceiling panel to the upper portion of the fuselage for introducing daylight downwardly into the interior area, wherein the fuselage defines a longitudinal centerline, the first window assembly is laterally spaced a predetermined distance from and on one side of the longitudinal centerline, and the second window assembly is laterally spaced the predetermined distance from and on the other side of the longitudinal centerline, wherein each of the first window assembly and the second window assembly is flanked by adjacent frame members of the plurality of frame members and adjacent stringers of the plurality of stringers, each of the first window assembly and second window assembly including a window pane, an inner cover and a retainer, the inner cover introduces the daylight from the window pane into the interior area, the retainer secures the window pane and the inner cover to the fuselage, wherein the interior area includes a toilet, the toilet defines a centerline extending in a lateral direction of the fuselage, and the first and second window assemblies (200, 230) are linearly offset in a common direction along the longitudinal centerline from the toilet centerline. a fuselage including a plurality of frame members disposed at predetermined intervals in a longitudinal direction of the fuselage and a plurality of stringers extending substantially linearly in the longitudinal direction, the fuselage defining an interior; a lavatory compartment located in the interior of the fuselage, the lavatory compartment including a ceiling panel and defining an interior area; a first window assembly mounted in the ceiling panel to an upper portion of the fuselage for introducing daylight downwardly into the interior area; and a second window assembly mounted in the ceiling panel to the upper portion of the fuselage for introducing daylight downwardly into the interior area, wherein the fuselage defines a longitudinal centerline, the first window assembly is laterally spaced a predetermined distance from and on one side of the longitudinal centerline, and the second window assembly is laterally spaced the predetermined distance from and on the other side of the longitudinal centerline, wherein each of the first window assembly and the second window assembly is flanked by adjacent frame members of the plurality of frame members and adjacent stringers of the plurality of stringers, each of the first window assembly and second window assembly including a window pane, an inner cover and a retainer, the inner cover introduces the daylight from the window pane into the interior area, the retainer secures the window pane and the inner cover to the fuselage, wherein the interior area includes a toilet, the toilet defines a centerline extending in a lateral direction of the fuselage, and the first and second window assemblies (200, 230) are linearly offset in a common direction along the longitudinal centerline from the toilet centerline.