How do flying billboards work? How is it deployed after the plane is airborne?

I see the plane flying and the banner or billboard follows behind it without flapping. It seems to remain vertical %26amp; fully deployed. I saw the G.I.E.C.O insurance ad flying over Turner Field in Atl. It seemed to be about 20 ft. X 30 ft. It remained vertical %26amp; level w/ no flapping. How do thay do that?|||The banner has what's called a mastpole at it's front. Several bridles join into a tow rope, this is the end that it connect to the aircraft. Between every letter these is a rod. The Mastpoles and rods are all usually strong plastic, or aluminum. The mastpole sometimes is weighed down by something for additional stability.





You didn't ask for this but it's interesting. the Banner is than laid next to the runway, and it's tow rope suspended into a loop by the end of the runway. It is held here by masking tape.





The pilot swings down and a grappling hook gets hold of the banner, tearing away the tape.( masking tape breaks away easy er than duck tape) The grappling hook can be released from the cockpit, and this is how eventually the banner is released prior to landing.





It is important to note that the hook is NOT left outside during the takeoff. It is thrown out after the aircraft is in the air.|||Most aerial advertising is done by towing the manufactured


device that is towed behind small airplanes and is made of up of the same type of material as parachutes. Like a parachute the various slits and holes in the advertising banner are designed to let the wind flow through it and stabilize it as it is being towed through the air. From far away it looks like a solid structure but close inspection of the device would show that it is indeed full of holes and stitched segments designed to allow it to give the least amount of air resistance while using the air flowing through it for stabilization.