Hi Fichakir.
this is more a as3 problem :
currently, you're not passing the loaded bitmapdata in your method.
try:
var loadedBmp : Bitmap = e.target.content as Bitmap;
var bmp:BitmapData = new BitmapData
(loadedBmp.width,loadedBmp.height,true,0x00000000);
here you have a bitmap and a fully transparent bitmapdata.
Now you should draw your bitmap into this bitmapdata:
bmp.draw(loadedBmp,new Matrix());
then call you method:
createPlane(bmp);
you can also achive it this way:
function imageLoaded (e : Event ) : void {
createPlane(Bitmap(e.target.content).bitmapData));
}