Layout of the top part of an aircraft cabin This layout involves an aircraft cabin (4) that includes a main structure (18) being the structure of the aircraft and enclosing the cabin (4); a bridge (20) forming a flat surface on which the seats (12, 42) are secured; an aisle (32) extending longitudinally in cabin (4) and elevated with respect to bridge (20), and beds or cots (14) accessed by said aisle (32) and arranged above seats (12,42) of bridge (20), transversally with respect to aisle (32) and on both sides of such aisle.