Jonathon pointed out something to add. The airliners are not guaranteed to be on that particular path. Sometimes we are vectored off path for spacing reasons, or more frequently, once you are cleared for a visual approach you can do whatever you want. Come down quickly, veer away from the Ontario if you need more time to come down, turn directly toward Ontario if you are coming down fast enough.
In Mark’s picture the airplane veering left is probably to give themselves more time to come down.