An air vehicle fuselage adapted for transonic operation, the fuselage comprising: a body comprising a transition station at an aft end of the body, wherein a lower surface of the body has a first waterline value at the transition station; a close-out coupled to the body at the transition station, wherein a lower surface of the close-out has a waterline value that varies along a fore-aft direction of the fuselage and is equal to the first waterline value at the transition station and wherein the lower surface of the close-out connects to an upper surface of the close-out at an aft end of the close-out; and a drag-reduction blivet disposed on the lower surface of the close-out, the blivet comprising: a first region comprising a first section starting at the transition station wherein the lower surface comprises an outward bend and drops to a point comprising a third waterline value that is below the first waterline value, and the first region comprising a second section starting from the first section wherein the lower surface comprises an inward bend comprising a first inward radius of curvature; and a second region disposed aft of the first region wherein the lower surface rises while having a second radius of curvature is equal to a minimum radius of curvature of the lower surface within the second region, the second radius of curvature being greater than the first radius of curvature, characterized in that the outward bend in the first section of the first region has a small radius of curvature compared to the large first inward radius of curvature of the inward bend in the second section of the first region. a body comprising a transition station at an aft end of the body, wherein a lower surface of the body has a first waterline value at the transition station; a close-out coupled to the body at the transition station, wherein a lower surface of the close-out has a waterline value that varies along a fore-aft direction of the fuselage and is equal to the first waterline value at the transition station and wherein the lower surface of the close-out connects to an upper surface of the close-out at an aft end of the close-out; and a drag-reduction blivet disposed on the lower surface of the close-out, the blivet comprising: a first region comprising a first section starting at the transition station wherein the lower surface comprises an outward bend and drops to a point comprising a third waterline value that is below the first waterline value, and the first region comprising a second section starting from the first section wherein the lower surface comprises an inward bend comprising a first inward radius of curvature; and a second region disposed aft of the first region wherein the lower surface rises while having a second radius of curvature is equal to a minimum radius of curvature of the lower surface within the second region, the second radius of curvature being greater than the first radius of curvature, characterized in that the outward bend in the first section of the first region has a small radius of curvature compared to the large first inward radius of curvature of the inward bend in the second section of the first region. a first region comprising a first section starting at the transition station wherein the lower surface comprises an outward bend and drops to a point comprising a third waterline value that is below the first waterline value, and the first region comprising a second section starting from the first section wherein the lower surface comprises an inward bend comprising a first inward radius of curvature; and a second region disposed aft of the first region wherein the lower surface rises while having a second radius of curvature is equal to a minimum radius of curvature of the lower surface within the second region, the second radius of curvature being greater than the first radius of curvature, characterized in that the outward bend in the first section of the first region has a small radius of curvature compared to the large first inward radius of curvature of the inward bend in the second section of the first region.