Abstract: An aircraft seat with a support structure (22), a first seating surface (26) and a first back piece (30), the lower area of which is connected to the support structure (22) so as to be capable of swiveling. The seat permits upright sitting of a person in a first position of the first back piece (30). The first back piece (30) can be put down in such a way that it runs horizontally over the first seating surface (26) in a second position. The back side of the first back piece (30) forms a second seating surface (38). A second back piece (40) is arranged between the support structure (22) and the first back piece so as to be capable of being folded out or unfolded so that the seat (20) forms a recliner for the person in the second position of the first back piece (30).