A high-lift device surface and associated method of designing the high-lift device surface is described. Methods include entering one or more flight conditions, and receiving aerodynamic forces at a wing, the wing comprising a fixed portion, a seal coupled to and extending from the fixed portion of the wing, and a high-lift device surface having an as-built shape determined based on an anticipated deformation during flight. Methods also include deforming the high-lift device surface based, at least in part, on the received aerodynamic forces, contacting, based on the deforming, the high-lift device surface with the seal, wherein the deforming causes the high-lift device to deform from the as-built shape to a second shape, and wherein the contacting causes the high-lift device to fully contact the seal to prevent air flow between the seal and the high-lift device surface due to the received aerodynamic forces.