A line segment of a fuel line in an aircraft for connecting at least three lines is provided. In order to provide fuel channeling in an aircraft, having, for example, better damage or leakage features, a line segment is provided that has a wall structure forming a continuous cavity. The wall structure has at least three adapter openings for connecting the continuous cavity with respectively one line. The wall structure is designed double walled between the adapter openings in such a way that an intermediate cavity is formed, which encases the continuous cavity.