Aerial advertisement

Came across a new way of advertising/promotion. First time paartha podhu "uhh..different-a erukke"-nnu irundadhu. There is a glider which flies at a comfortable height from the ground and it tows an advertisement banner. Trick here is, since it flies at a less height, there is no question of attracting the attention of the people and the font is so big that you can read it easily in its vicinity. And these guys tow the advertisement on special occations/events when there is large crowd.
Heard that there are quite a few restrictions on the height at which the glider/aircraft should fly for these kind of advertisement, the places where it shouldnt be flown etc.. Itseems sometimes they pull marriage proposal signs, birthday messages too.. Is it a copy-cat from cinema or vice versa??
Anyways I feel this is a novel idea.