If a plane is in a good position for you, it's possible to freeze its location and move the cars. I've come to the conclusion that planes are often traversing the far end of the straightaway when my car is entering the near end. It can be nice to juxtapose cars and plane. So my car needs to be moved closer to the plane. Here's how. Pause the replay, and check that the plane is where you want it. You just got to experiment with this. Back and forth, using the play/pause and skip 10 seconds buttons only. When the plane is positioned, move the cars forward using the "frame-forward" button (to the right of Play). The planes will not move when you use the frame-forward button.