An aircraft wing comprising: a leading edge, the leading edge including an attachment line being a region where, in use, air impinging on the region flows in a boundary layer spanwise along the leading edge, a first slat and a second slat wherein the leading edge and the attachment line are at least partially formed at the first and second slats (22, 24), wherein the second slat is located adjacent to the first slat in the downstream direction of the attachment line flow, so that the leading edge includes a slat-to-slat junction, wherein a slat cavity is formed at the slat-to-slat junction beneath a skin area of at least one of the first and the second slats (22, 24), and characterized by: a duct having a duct entrance at the slat-to-slat junction for receiving spanwise flow along the leading edge of the wing, the duct being at least partly formed by said slat cavity, wherein the duct entrance extends around the leading edge and over the range of positions of the attachment line at the slat-to-slat junction in use, wherein the second slat includes a slat lip extending from the slat-to-slat junction transverse to the leading edge, and the slat lip is protruding in a chordwise direction over an adjacent slat lip area of the first slat so that a step is formed between the first and second slats (22, 24) wherein the said duct entrance comprises an orifice in said step. a leading edge, the leading edge including an attachment line being a region where, in use, air impinging on the region flows in a boundary layer spanwise along the leading edge, a first slat and a second slat wherein the leading edge and the attachment line are at least partially formed at the first and second slats (22, 24), wherein the second slat is located adjacent to the first slat in the downstream direction of the attachment line flow, so that the leading edge includes a slat-to-slat junction, wherein a slat cavity is formed at the slat-to-slat junction beneath a skin area of at least one of the first and the second slats (22, 24), and characterized by: a duct having a duct entrance at the slat-to-slat junction for receiving spanwise flow along the leading edge of the wing, the duct being at least partly formed by said slat cavity, wherein the duct entrance extends around the leading edge and over the range of positions of the attachment line at the slat-to-slat junction in use, wherein the second slat includes a slat lip extending from the slat-to-slat junction transverse to the leading edge, and the slat lip is protruding in a chordwise direction over an adjacent slat lip area of the first slat so that a step is formed between the first and second slats (22, 24) wherein the said duct entrance comprises an orifice in said step. a duct having a duct entrance at the slat-to-slat junction for receiving spanwise flow along the leading edge of the wing, the duct being at least partly formed by said slat cavity, wherein the duct entrance extends around the leading edge and over the range of positions of the attachment line at the slat-to-slat junction in use, wherein the second slat includes a slat lip extending from the slat-to-slat junction transverse to the leading edge, and the slat lip is protruding in a chordwise direction over an adjacent slat lip area of the first slat so that a step is formed between the first and second slats (22, 24) wherein the said duct entrance comprises an orifice in said step.