Sickyellcell, that video appears to shows water coming out of a forward heated drain mast, from the galley/kitchen. See this thread for related occurrence
http://www.airliners.net/aviation-forums/tech_ops/read.main/323769/
I think there's no evidence that what people describe as "chemtrails" are anything other than contrails, or very occasionally other normal phenomena like drain masts
http://www.airliners.net/aviation-forums/tech_ops/read.main/323769/
I think there's no evidence that what people describe as "chemtrails" are anything other than contrails, or very occasionally other normal phenomena like drain masts