A seat device for a tilting vehicle includes: at least one seat body which has a seat surface on which a user of the tilting vehicle can be disposed and to which a force acting in a direction of action can be applied, the direction of action running transversely to the seat surface; at least one support unit which has at least one resiliently flexible and/or deformable first support portion on which the seat body is disposed, at least one rigid, non-flexible second support portion, and at least one cavity extending parallel or obliquely to the seat surface and disposed between the first support portion and the second support portion, by which cavity the first support portion and the second support portion are spaced apart from each other without touching and by which an elastic deformation of the first support portion toward the cavity is enabled. At least one adjustment unit has at least one adjustment body which is disposed movably in the cavity and by which the first support portion is supported against the second support portion and can be transferred from a first support position to a second support position.

A seat for an aircraft is provided that includes a seat pan, having a seat pan front edge and a seat pan rear edge, a backrest, having a backrest top edge and a backrest bottom edge, where the backrest bottom edge is articulately disposed adjacent to the seat pan rear edge, a headrest, having a headrest top edge and a headrest bottom edge, where the headrest bottom edge is articulately disposed adjacent to the backrest top edge, a tracking device disposed beneath the seat pan and being attachable to a floor of the aircraft, the tracking device permitting the seat pan to translate in at least one of a lateral direction and a longitudinal direction, and a swivel connected between the tracking device and the seat pan, permitting the seat pan to rotate with respect to the tracking device.