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In combination with an aircraft fuselage, an annular support member inwardly spaced from the fuselage surface and intermediate the fuselage length, said surface having an opening concentric with and of larger diameter than the support member, a ring concentric with and carried by said support member for rotation relative thereto, an upwardly and outwardly flaring element terminating substantially at the edge of said fuselage opening, and a flat conical transparent turret carried by said member having its cone base substantially in the plane of the fuselage surface, said turret affording a substantially streamlined protuberance above the fuselage surface.