Seat device, in particular flight passenger seat device, with at least one seat bottom unit (14; 14a) and with a backrest unit (26; 26a) which is connected to the seat bottom unit (14; 14a), which comprises a rigid sub-region (90; 90a) that is rigidly coupled with the seat bottom unit (14; 14a), and comprises an upper sub-region (92; 92a) that is realized so as to be pivotable with respect to the rigid lower sub-region (90; 90a), characterized in that the backrest unit (26; 26a) comprises a bearing unit having a maximal pivot range of approximately 35 degrees by which the lower sub-region and the upper sub-region are pivotable relative to each other, wherein the backrest unit (26; 26a) can be positioned in a comfort position, which is realized as a basic position optimized for passenger comfort, in which the backrest unit (26; 26a) forms a substantially planar continuous surface and in which the backrest unit has an inclination pivoted from a TTL position to the rear and permitting a passenger a non-upright sitting position, wherein the rigid lower sub-region (90; 90a) of the backrest unit (26; 26a) and the pivotable upper sub-region (92; 92a) are aligned in the comfort position substantially in a plane relative to each other and are not pivoted relative to each other, and wherein the backrest unit (26; 26a) can be positioned in a further sitting position, which is realized as a TTL position and in which the backrest unit (26; 26a) has a different inclination with respect to a cabin floor than in the comfort position, wherein for an adjustment of the backrest unit (26; 26a) only the pivotable upper sub-region (92; 92a) is pivoted with respect to the rigid lower sub-region (90; 90a). with at least one seat bottom unit (14; 14a) and with a backrest unit (26; 26a) which is connected to the seat bottom unit (14; 14a), which comprises a rigid sub-region (90; 90a) that is rigidly coupled with the seat bottom unit (14; 14a), and comprises an upper sub-region (92; 92a) that is realized so as to be pivotable with respect to the rigid lower sub-region (90; 90a), characterized in that the backrest unit (26; 26a) comprises a bearing unit having a maximal pivot range of approximately 35 degrees by which the lower sub-region and the upper sub-region are pivotable relative to each other, wherein the backrest unit (26; 26a) can be positioned in a comfort position, which is realized as a basic position optimized for passenger comfort, in which the backrest unit (26; 26a) forms a substantially planar continuous surface and in which the backrest unit has an inclination pivoted from a TTL position to the rear and permitting a passenger a non-upright sitting position, wherein the rigid lower sub-region (90; 90a) of the backrest unit (26; 26a) and the pivotable upper sub-region (92; 92a) are aligned in the comfort position substantially in a plane relative to each other and are not pivoted relative to each other, and wherein the backrest unit (26; 26a) can be positioned in a further sitting position, which is realized as a TTL position and in which the backrest unit (26; 26a) has a different inclination with respect to a cabin floor than in the comfort position, wherein for an adjustment of the backrest unit (26; 26a) only the pivotable upper sub-region (92; 92a) is pivoted with respect to the rigid lower sub-region (90; 90a).