Strange Traffic Sign — What does it mean?

I can’t imagine what this sign is trying to warn you from, but here are a few ideas:

  • “DANGER: Do not tie plane to car.”
  • “DANGER: Bouncing planes may strike your car.”
  • “DANGER: Airplane lavatory may leak onto your car.”

Actually, it looks like the plane has a wire dangling from it, and that wire may strike your car if you’re not careful. Why would a plane have a wire attached to like this? Could it be one of those planes that drags a banner behind it? Consider me confused.