An aircraft having a connection element for connecting at least one first conduit element or the like positioned in a supply chamber of an aircraft with at least one second conduit element positioned in a cabin chamber of the aircraft, where the supply chamber and cabin chamber are separated from each other by a separation element, substantially comprising a connection part comprising fastening elements for fastening the first and second conduit element. Known connection elements have the disadvantage that there occur sealing problems due to the fastening of the fastening element at the outside of the connection part at the end facing the cabin chamber. A further disadvantage is that the connection elements protrude into the cabin chamber and form edges over which one may stumble there. In that at least the fastening element for the fastening the conduit element of the cabin chamber is provided within the connection part, there may be realized a compact structural shape which does not protrude from the separating element into the cabin chamber, and which may in addition be reliably sealed.