1) Fold back the top edge of the plane diagram below. You want A to touch X, B to touch Y, and C to touch Z.
2) Put some tape at points X, Y, & Z to hold the paper in that "airfoil curve".
3) Now fold the paper along that gray line from B to the tail of the plane at a "V" angle.
4) You may need to put a tiny paper-clip or some tape at point B to balance the plane.