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 form in the lying-down position a planar lying-down surface , the two lying-down surfaces of the aircraft seats 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 with the aircraft seat regions are arranged in an aircraft cabin in a herringbone aircraft seat arrangement, wherein the aircraft seats are in each case oriented obliquely to a flight direction , the aircraft seat regions 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 form in the lying-down position a planar lying-down surface , the two lying-down surfaces of the aircraft seats 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 with the aircraft seat regions are arranged in an aircraft cabin in a herringbone aircraft seat arrangement, wherein the aircraft seats are in each case oriented obliquely to a flight direction , the aircraft seat regions in each case having direct aisle access. <EOS>