I am a glider instructor and this is a warning to motorists to watch for the tow rope attached to the end of the tow plane as it is landing. The rope has a metal ring on its end. The profile drawing is a Piper Pawnee if anyone is interested. Could be a banner tow plane as well but the tow plane doesn't usually land with the banner tow rope attached. A glider tow plane almost always lands with the rope attached. Some tow planes have internal reels to wind in the rope, but such is not all that common.

To label this merely as a stunt is an insult. It is clearly the result of countless hours of practice – the kind of devotion one applies to an art.