import flash.events.Event;

var fly:airPlain = new airPlain();
this.addChild(fly);
stage.addEventListener(Event.ENTER_FRAME,moveHandler);

function moveHandler(e:Event):void{
    fly.x += (mouseX-fly.x)*0.1;
    fly.y += (mouseY-fly.y)*0.1;
    var X:Number = mouseX - fly.x;
    var Y:Number = mouseY - fly.y;
    var angle:Number = Math.atan2(Y,X);
    fly.rotation = angle * 180/Math.PI+90;
}

처음에 Math.PI/180 으로써서 돌아가질않아 혼났네요.......

이 게시물을..