For years now, people have noticed planes flying in a certain and deliberate pattern in the skies above their cities. The planes leave what appears to be at first just the traditional contrail plume behind them as they go, but if you watch, it quickly becomes clear this is no ordinary contrail. The width is several times wider than the traditional trails planes leave in their wake, and it seems to hang in the sky almost as if it is suspended there. Some would argue that it is designed to do exactly that. These strange contrails also have the ability to obscure the radar screen of air traffic controllers, something ordinary contrails would never be able to do. So serious is this problem that when flying occurs over a city, the airport is notified that "military exercises" are in progress that day and all commercial aircraft is instructed to fly underneath its pattern so that they may be seen on radar. Rumors on what exactly is contained in these strange trails have been brewing and multiplying for as many years as they have been spotted.
Also see: this link.
http://www.cosmiverse.com/paranormal03050203.html
