A vane stage for a variable area turbine, comprising: a plurality of vane platforms comprising a first vane platform and a second vane platform, one of the plurality of vane platforms being a radial inner vane platform and another of the plurality of vane platforms being a radial outer vane platform, and a space therebetween defining an air flowpath; a primary vane body secured at opposing radial ends to the first vane platform and the second vane platform, the primary vane body having a primary leading edge, a primary trailing edge, a primary pressure side and a primary suction side, a secondary vane body movably secured at the first vane platform, the secondary vane body having secondary leading edge a secondary trailing edge, a secondary pressure side and a secondary suction side, and the secondary vane body being movable between a stowed position, wherein the secondary vane body is outside of the air flow path, and a deployed position, wherein the secondary vane body is extended between the plurality of vane platforms to form a vane trailing edge extension; characterized in that: the secondary vane body includes a plurality of radially spaced tabs that support the secondary pressure side and secondary suction side of the secondary body, the plurality of tabs defining the leading edge of the secondary vane body and the tabs forming a first boss for positioning the secondary vane body at the trailing edge of the primary vane body; and a trailing edge of the plurality of tabs is tapered to form an air convergence cavity within the secondary vane body, and wherein the air convergence cavity receives air flowing from the trailing edge of the primary vane body when the secondary vane body is in the deployed position. a plurality of vane platforms comprising a first vane platform and a second vane platform, one of the plurality of vane platforms being a radial inner vane platform and another of the plurality of vane platforms being a radial outer vane platform, and a space therebetween defining an air flowpath; a primary vane body secured at opposing radial ends to the first vane platform and the second vane platform, the primary vane body having a primary leading edge, a primary trailing edge, a primary pressure side and a primary suction side, a secondary vane body movably secured at the first vane platform, the secondary vane body having secondary leading edge a secondary trailing edge, a secondary pressure side and a secondary suction side, and the secondary vane body being movable between a stowed position, wherein the secondary vane body is outside of the air flow path, and a deployed position, wherein the secondary vane body is extended between the plurality of vane platforms to form a vane trailing edge extension; characterized in that: the secondary vane body includes a plurality of radially spaced tabs that support the secondary pressure side and secondary suction side of the secondary body, the plurality of tabs defining the leading edge of the secondary vane body and the tabs forming a first boss for positioning the secondary vane body at the trailing edge of the primary vane body; and a trailing edge of the plurality of tabs is tapered to form an air convergence cavity within the secondary vane body, and wherein the air convergence cavity receives air flowing from the trailing edge of the primary vane body when the secondary vane body is in the deployed position. the secondary vane body includes a plurality of radially spaced tabs that support the secondary pressure side and secondary suction side of the secondary body, the plurality of tabs defining the leading edge of the secondary vane body and the tabs forming a first boss for positioning the secondary vane body at the trailing edge of the primary vane body; and a trailing edge of the plurality of tabs is tapered to form an air convergence cavity within the secondary vane body, and wherein the air convergence cavity receives air flowing from the trailing edge of the primary vane body when the secondary vane body is in the deployed position.