Lining element of an edge of an aeronautical seat shell, method for manufacturing and method for setting up such an element

An aeronautical seat shell lining element that is flexible for lining an edge of an aeronautical seat shell, characterized in that it is made up of an assembly of at least two elongate, flexible and planar cut pieces, secured together by respective longitudinal boundaries abutting against each other, wherein the assembly is configured to have a three-dimensional shape matching with an edge of an aeronautical seat shell so as to effect lining of the aeronautical seat shell, wherein the aeronautical seat shell lining element comprises three cut pieces, the aeronautical seat shell lining element having a substantially U-like shaped cross-section.