An aircraft comprising a fuselage delimiting an interior space comprising a forward part (2, 66, 88, 92) comprising - a cockpit occupying a forward most part of the interior space, - a cockpit wall separating the cockpit from a remaining part of the interior space, - at least one forward cabin door, which is arranged directly behind the cockpit wall for accessing the interior space of the aircraft from outside the fuselage, - at least one first modular installation space (22, 68) for receiving installation equipment, - a plurality of seat rows of a first type, each formed by first groups of a predetermined number of seats located side-by-side, - at least one longitudinal aisle extending along the interior space through the seat rows of the first type and thereby separating adjacent groups (26, 32, 86) of seats from each other, and - an access path (16, 80, 82) for each of the at least one cabin door, extending from the respective cabin door to at least one of the at least one longitudinal aisle, thereby creating an intersection region (18, 84) between the respective access path (16, 80, 82) and the respective longitudinal aisle, - at least one second modular installation space for receiving installation equipment, said at least one second modular installation space being located between the cockpit wall and the at least one access path (16, 80, 82), wherein the at least one second modular installation space extends up to the intersection region, wherein the at least one first modular installation space (22, 68) is arranged directly forward of the seat rows of the first type and extends in a substantially lateral direction less than a first group of seats located immediately behind the at least one first modular installation space (22, 68), wherein at least one of the at least one first modular installation space (22, 68) comprises at least an additional first group of seats, and wherein the at least one access path (16, 80, 82) extends from the at least one longitudinal aisle, at an angle of at least 100° to the at least one longitudinal aisle, in a forward direction. - a cockpit occupying a forward most part of the interior space, - a cockpit wall separating the cockpit from a remaining part of the interior space, - at least one forward cabin door, which is arranged directly behind the cockpit wall for accessing the interior space of the aircraft from outside the fuselage, - at least one first modular installation space (22, 68) for receiving installation equipment, - a plurality of seat rows of a first type, each formed by first groups of a predetermined number of seats located side-by-side, - at least one longitudinal aisle extending along the interior space through the seat rows of the first type and thereby separating adjacent groups (26, 32, 86) of seats from each other, and - an access path (16, 80, 82) for each of the at least one cabin door, extending from the respective cabin door to at least one of the at least one longitudinal aisle, thereby creating an intersection region (18, 84) between the respective access path (16, 80, 82) and the respective longitudinal aisle, - at least one second modular installation space for receiving installation equipment, said at least one second modular installation space being located between the cockpit wall and the at least one access path (16, 80, 82), wherein the at least one second modular installation space extends up to the intersection region,