Azasemey

<script>
          const plane = document.getElementById("plane");
          let n = 0;
          const maxTravel = window.outerWidth-plane.offsetWidth;
          let direction = 0;
          plane.style.left = "";
         function movePlane(){     
            if(n < maxTravel  && direction === 0)  {    
            n++;
            plane.style.left = `${n}px`; 
            plane.classList.remove('reverse') 
            }else {
                direction = 1;
                n--
                plane.style.left = `${n}px`
                plane.classList.add('reverse')
            };
            if(n<0){
                direction = 0;
            }
          };
          setInterval(movePlane,   5);
        </script>