An aircraft, comprising: a fuselage, wherein the fuselage comprises an outer fuselage skin that at least partially defines an outer surface of the fuselage; and a wing assembly operably coupled to the fuselage via a wing-to-fuselage joint, wherein the wing assembly comprises: a left wing region comprising a lower left-wing-region skin that at least partially defines a lower left-wing-region airfoil surface and an upper left-wing-region skin that at least partially defines an upper left-wing-region airfoil surface; a right wing region comprising a lower right-wing-region skin that at least partially defines a lower right-wing-region airfoil surface and an upper right-wing-region skin that at least partially defines an upper right-wing-region airfoil surface; and a center wing region between the left wing region and the right wing region and comprising a lower center-wing-region skin; wherein: the wing-to-fuselage joint includes a single skin segment (210, 220, 230, 240, 250, 260, 270) that at least partially defines both the outer fuselage skin and the lower center-wing-region skin; and the single skin segment (220, 230) further at least partially defines at least one of the lower left-wing-region skin and lower right-wing-region skin. a fuselage, wherein the fuselage comprises an outer fuselage skin that at least partially defines an outer surface of the fuselage; and a wing assembly operably coupled to the fuselage via a wing-to-fuselage joint, wherein the wing assembly comprises: a left wing region comprising a lower left-wing-region skin that at least partially defines a lower left-wing-region airfoil surface and an upper left-wing-region skin that at least partially defines an upper left-wing-region airfoil surface; a right wing region comprising a lower right-wing-region skin that at least partially defines a lower right-wing-region airfoil surface and an upper right-wing-region skin that at least partially defines an upper right-wing-region airfoil surface; and a center wing region between the left wing region and the right wing region and comprising a lower center-wing-region skin; a left wing region comprising a lower left-wing-region skin that at least partially defines a lower left-wing-region airfoil surface and an upper left-wing-region skin that at least partially defines an upper left-wing-region airfoil surface; a right wing region comprising a lower right-wing-region skin that at least partially defines a lower right-wing-region airfoil surface and an upper right-wing-region skin that at least partially defines an upper right-wing-region airfoil surface; and a center wing region between the left wing region and the right wing region and comprising a lower center-wing-region skin; wherein: the wing-to-fuselage joint includes a single skin segment (210, 220, 230, 240, 250, 260, 270) that at least partially defines both the outer fuselage skin and the lower center-wing-region skin; and the single skin segment (220, 230) further at least partially defines at least one of the lower left-wing-region skin and lower right-wing-region skin. the wing-to-fuselage joint includes a single skin segment (210, 220, 230, 240, 250, 260, 270) that at least partially defines both the outer fuselage skin and the lower center-wing-region skin; and the single skin segment (220, 230) further at least partially defines at least one of the lower left-wing-region skin and lower right-wing-region skin.