flightPath e o meu polyline com tds os pontos do mapa do percurso	

	var path = flightPath.getPath();
	
	var a = path.length;
	for(i = 0; i < a; i++)
		path.pop();
			
	flightPath.setMap(null);

	if (myMarkers) 
   		for (i in myMarkers) 
    	 	myMarkers[i].setMap(null);

	myMarkers.length = 0;