AS3 visible bounds of DisplayObject

PPPlane.as

package {
 
    import flash.display.Sprite;
    import flash.display.Graphics;
    import flash.geom.Rectangle;
    import flash.geom.PerspectiveProjection;
    import flash.display.BitmapData;
 
    public class PPPlane extends Sprite  {
 
        public function PPPlane():void {
            var Plane:Sprite = drawPlane();
            Plane.x = (stage.stageWidth - Plane.width) * 0.5;
            Plane.y = (stage.stageHeight - Plane.height) * 0.5;
            Plane.z = 100;
            Plane.rotationY = 70;
            Plane.rotationX = 20;
            Plane.rotationZ = 30;
            addPerspective();
            addChild(Plane);
            trace("Plane size: "+Plane.width+"x"+Plane.height);
            var bounds:Rectangle = Plane.getBounds(stage);
            trace("Plane bounds: "+bounds);
            var visibleBounds:Rectangle = visibleBitmapBounds();
            trace("Visible, on-screen bounds of the Plane: "+visibleBounds);
        }  
 
        private function addPerspective():void {
            var pp:PerspectiveProjection = new PerspectiveProjection();
            pp.fieldOfView = 120;
            this.transform.perspectiveProjection = pp;
        }
 
        private function drawPlane():Sprite {
            var Plane:Sprite = new Sprite();
            Plane.graphics.beginFill(0x0000FF);
            Plane.graphics.drawRect(0, 0, 200, 200);
            Plane.graphics.endFill();
            return Plane;
        }
 
        private function visibleBitmapBounds():Rectangle {
            var w:int = stage.stageWidth;
            var h:int = stage.stageHeight;
            var bitmapData:BitmapData = new BitmapData(w, h, true, 0);
            bitmapData.draw(this)
            var bounds:Rectangle = bitmapData.getColorBoundsRect(0xFF000000, 0x00000000, false);
            bitmapData.dispose();
            return bounds;
        }
    }
}

gist from ActionScript 3 lacks functionality for visible bounds of DisplayObject on flash tekkie.