Abstract: This device is provided for protecting and covering a rail for fixing the seats of a commercial aircraft equipped with a device for automatically varying the pitch of the seats, the feet of the seats being fast with bases connected by connecting laths. A long upper rail cover, of width greater than that of the rail, totally covers the rail and is in contact, by its longitudinal edges, with the floor carpet. This rail cover is fast with the seat connecting lath, and horizontal blades fast with each base of a foot extend longitudinally over a certain length under the rail cover, between the latter and the connecting lath, to form, with this rail cover, a telescopic assembly and thus to cover the whole of the rail between the rear foot of one seat and the front foot of the following seat.