Aircraft seat having a base frame comprising: - a rear base frame tube comprising a noncircular cross-section; and - a front base frame tube comprising a noncircular cross-section, - the rear base frame tube comprising a long axis and a short axis that collectively define an elliptical shape, - the front base frame tube comprising a long axis and a short axis that collectively define an elliptical shape, characterized in that - the rear base frame tube is positioned such that a line through the long axis of the rear base frame tube slopes forwardly and upwardly at substantially a 35-55 degree angle relative to a horizontal defined by a cabin floor, to which the aircraft seat is mountable; - the rear base frame tube having a long axis of 60mm +/- 10mm and a short axis of 40mm+/- 10mm, - the front base frame tube is positioned such that a line through the long axis of the front base frame tube slopes forwardly and downwardly at substantially a 10-30 degree angle relative to the horizontal, - the front base frame tube having a long axis of 55mm +/- 10mm and a short axis of 45mm+/- 10mm, - a front leg being vertically arranged below a front half of the front base frame tube, - a rear leg extending vertically from below the rear base frame tube and then extending rearward to the bottom at an angle of approximatively 45°; and - a stiffener arranged at an angle of approximatively 35° between the rear leg and the front base frame tube, - the rear base frame tube and the front base frame tube each comprising a first wall portion having a first wall thickness and a second wall portion having a second wall thickness, wherein the first and second wall thicknesses (T1, T2) differ between the first wall portion and the second wall portion, the first wall thickness being of 1mm and the second wall thickness being of 2 mm or the first wall thickness being of 1.5mm and the second wall thickness being of 3mm, - the rear base frame tube and the front base frame tube comprising magnesium or a magnesium alloy. - a rear base frame tube comprising a noncircular cross-section; and - a front base frame tube comprising a noncircular cross-section, - the rear base frame tube comprising a long axis and a short axis that collectively define an elliptical shape, - the front base frame tube comprising a long axis and a short axis that collectively define an elliptical shape, characterized in that - the rear base frame tube is positioned such that a line through the long axis of the rear base frame tube slopes forwardly and upwardly at substantially a 35-55 degree angle relative to a horizontal defined by a cabin floor, to which the aircraft seat is mountable; - the rear base frame tube having a long axis of 60mm +/- 10mm and a short axis of 40mm+/- 10mm, - the front base frame tube is positioned such that a line through the long axis of the front base frame tube slopes forwardly and downwardly at substantially a 10-30 degree angle relative to the horizontal, - the front base frame tube having a long axis of 55mm +/- 10mm and a short axis of 45mm+/- 10mm, - a front leg being vertically arranged below a front half of the front base frame tube, - a rear leg extending vertically from below the rear base frame tube and then extending rearward to the bottom at an angle of approximatively 45°; and - a stiffener arranged at an angle of approximatively 35° between the rear leg and the front base frame tube, - the rear base frame tube and the front base frame tube each comprising a first wall portion having a first wall thickness and a second wall portion having a second wall thickness, wherein the first and second wall thicknesses (T1, T2) differ between the first wall portion and the second wall portion, the first wall thickness being of 1mm and the second wall thickness being of 2 mm or the first wall thickness being of 1.5mm and the second wall thickness being of 3mm, - the rear base frame tube and the front base frame tube comprising magnesium or a magnesium alloy.