I've had this idea for a while. I can't see anything wrong with it. Maybe someone here can tell me if it's unsound. The idea is based on the dimpling of a golf ball. To my knowledge the dimpling of a golf ball reduces air friction and lets it go farther. I even heard of someone dimpling a bat so they could swing faster. Some golf club heads have dimples too. My idea is to dimple the skin of a jet airliner. Since they pretty much cruise at a constant airspeed the dimpling could be optimized for that speed to reduce air friction and increase fuel efficiency. Is there some physics reason why this wouldn't work?