An aircraft seat arrangement comprising at least a first and a second aircraft seat for being mounted directly one after the other onto a seat rail which extends along a longitudinal direction of an aircraft cabin, the seat rail providing a grid of reference mounting positions with a pre-determined grid pitch for mounting at least the first and the second aircraft seat, wherein each of the first and the second aircraft seat comprises: - a seating structure having a seating area and a backrest extending upwards from the seating area wherein a seat reference point (SRP10, SRP20) is defined at the connection between the seating area and the backrest, and - a support supporting the seating structure , characterized in that each of the first and the second aircraft seat comprises one of a first and a second seat rail adapter connected on the support, the first and the second seat rail adapter being configured to mount the support at a reference mounting position (MP10, MP20) onto the seat rail , wherein the first aircraft seat comprises the first seat rail adapter and the second aircraft seat comprises the second seat rail adapter ; wherein the first seat rail adapter is configured such that the seat reference point (SRP10) of the first aircraft seat is spaced in the longitudinal direction from the reference mounting position (MP10) at which the first seat rail adapter is connected, by a first distance (dio); wherein the second seat rail adapter is configured such that the seat reference point (SRP20) of the second aircraft seat is spaced in the longitudinal direction from the reference mounting position (MP20) at which the second seat rail adapter is connected, by a second distance (d20); and wherein the first distance (dio) differs from the second distance (d20) such that at least the first and the second aircraft seats, when mounted in the grid onto the seat rail , have a spacing between the respective seat reference points (SRP10, SRP20) which is not an integer multiple of the grid pitch of the seat rail . wherein each of the first and the second aircraft seat comprises: - a seating structure having a seating area and a backrest extending upwards from the seating area wherein a seat reference point (SRP10, SRP20) is defined at the connection between the seating area and the backrest, and - a support supporting the seating structure , - a seating structure having a seating area and a backrest extending upwards from the seating area wherein a seat reference point (SRP10, SRP20) is defined at the connection between the seating area and the backrest, and - a support supporting the seating structure , characterized in that each of the first and the second aircraft seat comprises one of a first and a second seat rail adapter connected on the support, the first and the second seat rail adapter being configured to mount the support at a reference mounting position (MP10, MP20) onto the seat rail , wherein the first aircraft seat comprises the first seat rail adapter and the second aircraft seat comprises the second seat rail adapter ; wherein the first seat rail adapter is configured such that the seat reference point (SRP10) of the first aircraft seat is spaced in the longitudinal direction from the reference mounting position (MP10) at which the first seat rail adapter is connected, by a first distance (dio); wherein the second seat rail adapter is configured such that the seat reference point (SRP20) of the second aircraft seat is spaced in the longitudinal direction from the reference mounting position (MP20) at which the second seat rail adapter is connected, by a second distance (d20); and wherein the first distance (dio) differs from the second distance (d20) such that at least the first and the second aircraft seats, when mounted in the grid onto the seat rail , have a spacing between the respective seat reference points (SRP10, SRP20) which is not an integer multiple of the grid pitch of the seat rail . <EOS>