Sal! Put this on the movie clip of the enemy jet. Change the 'mig' prefix into whatever the heck your plane is.


// START CODE
onClipEvent (load) {
 	migMoveSpeed=10;
}
onClipEvent (enterFrame) {
	this._x -= migMoveSpeed;
	if (this._x <= 0) {
		this.removeMovieClip();
	}
}
// END CODE