Passenger seat system

Passenger seat system comprising:

• a backrest and
• a seat, which comprises a first sub-portion having a first surface and a second, opposite surface to the first surface as well as a second sub-portion having a first surface and a second, opposite surface to the first surface, wherein the first sub-portion and the second sub-portion are movable relative to one another in order to adjust the seat between a first and a second operating position, and wherein the first sub-portion and the second sub-portion in the first operating position of the seat are positioned in relation to the backrest one behind the other in such a way that the first surface of the first sub-portion and the first surface of the second sub-portion form a usable total seat surface,
• wherein the first sub-portion and the second sub-portion in the second operating position of the seat are positioned in relation to the backrest one above the other in such a way that the first surface of the first sub-portion or the first surface of the second sub-portion forms a usable partial seat surface and the other one of the first surface of the first sub-portion or the other one of the first surface of the second sub-portion does not form a usable partial seat surface,
• wherein the first sub-portion or the second sub-portion is configured to move substantially longitudinally along a longitudinal axis of the backrest to enable the first sub-portion to be displaceable substantially parallel to the second sub-portion in the direction toward the backrest so that, in the second operating position, the second surface opposite the first surface forming a usable partial seat surface of the first or the second sub-portion rests on the first surface of the other sub-portion not forming a usable seat surface.