Aircraft sub-assembly and aircraft provided with such a sub-assembly

An aircraft comprising:

• at least one aircraft subassembly laid out on a floor of a cabin of the aircraft the at least one subassembly including
• at least one seat for a passenger;
• and
• a separating panel that extends along one of two opposite sides of the at least one seat between the at least one seat and an aisle, along a longitudinal dimension at least equal to that of the at least one seat and along a vertical dimension or height greater than that of the at least one seat so as to conceal at least partially behind the panel, a passenger occupying the at least one seat, the separating panel including, perpendicular to its height, along one of the two opposite sides of the at least one seat, a transverse curvature that begins at a front end of the separating panel at a front end of the at least one seat in the longitudinal direction and that extends along an entire length of the separating panel from the front end of the separating panel to a seat back of the at least one seat and has a concavity that is oriented toward the at least one seat, the transverse curvature including a convex curvature, projecting in a plane containing longitudinal and vertical directions of extension of the panel, the convex curvature extends along the entire length of the separating panel and forms a rounded upper edge.