An aircraft including a cabin inside which a floor is installed, and at least one arranging module which is fixed solely to the floor and which includes a front wall, a rear wall, a port-side wall and a starboard-side wall which are rigidly connected to one another. The port-side and starboard-side walls each have a door, a roof and a deck fixed to each of the front, rear, port-side and starboard-side walls, and a separating system which makes it possible to separate the internal volume of the arranging module into two volumes, each being accessible through one of the doors. Such an aircraft therefore provides an arranging module which is fixed solely to the floor of the cabin, thereby facilitating the set-up thereof.