Aircraft seat system with at least one first aircraft seat region comprising a first aircraft seat which has a seat bottom that is pivotally coupled with a backrest of the aircraft seat and has a legrest that is pivotally coupled with the seat bottom, with at least one second aircraft seat region arranged behind the first aircraft region and comprising a second aircraft seat which has a seat bottom that is pivotally coupled with a backrest of the aircraft seat and has a legrest that is pivotally coupled with the seat bottom, wherein the first aircraft seat region and the second aircraft seat region together form an aircraft seat unit, wherein the aircraft seat of the second aircraft seat region is in a mounted state, at least in a lying-down position, arranged at least with a partial overlap below the first aircraft seat region, and wherein the aircraft seats (12, 16) form in the lying-down position a planar lying-down surface (56, 58), the two lying-down surfaces (56, 58) of the aircraft seats (12, 16) overlapping in the lying-down positions, and with at least one further first aircraft seat region and a further second aircraft seat region, the two of which also forming an aircraft seat unit and respectively comprising an aircraft seat, characterised in that the seat bottom of the first aircraft seat has in a TTL position a same height as the seat bottom of the second aircraft seat in a TTL position, wherein the aircraft seat units (42, 48) with the aircraft seat regions (10, 14, 44, 46) are arranged in an aircraft cabin in a herringbone aircraft seat arrangement, wherein the aircraft seats (12, 16) are in each case oriented obliquely to a flight direction, the aircraft seat regions (10, 14, 44, 46) in each case having direct aisle access. with at least one first aircraft seat region comprising a first aircraft seat which has a seat bottom that is pivotally coupled with a backrest of the aircraft seat and has a legrest that is pivotally coupled with the seat bottom, with at least one second aircraft seat region arranged behind the first aircraft region and comprising a second aircraft seat which has a seat bottom that is pivotally coupled with a backrest of the aircraft seat and has a legrest that is pivotally coupled with the seat bottom, wherein the first aircraft seat region and the second aircraft seat region together form an aircraft seat unit, wherein the aircraft seat of the second aircraft seat region is in a mounted state, at least in a lying-down position, arranged at least with a partial overlap below the first aircraft seat region, and wherein the aircraft seats (12, 16) form in the lying-down position a planar lying-down surface (56, 58), the two lying-down surfaces (56, 58) of the aircraft seats (12, 16) overlapping in the lying-down positions, and with at least one further first aircraft seat region and a further second aircraft seat region, the two of which also forming an aircraft seat unit and respectively comprising an aircraft seat, characterised in that the seat bottom of the first aircraft seat has in a TTL position a same height as the seat bottom of the second aircraft seat in a TTL position, wherein the aircraft seat units (42, 48) with the aircraft seat regions (10, 14, 44, 46) are arranged in an aircraft cabin in a herringbone aircraft seat arrangement, wherein the aircraft seats (12, 16) are in each case oriented obliquely to a flight direction, the aircraft seat regions (10, 14, 44, 46) in each case having direct aisle access.