Taken on march 2010. We called the local government to ask what they are doing in the sky and what's that stripes in the air. Because it's not allowed for military to practise over cities. Local government sad: There are no air-planes, jets, etc.... at these days. Especially at one day: official there was 1 helicopter for this day. But as you can see there are a lot more air-planes, which couldn't be a helicopter at all! Or have you seen a helicopter producing contrails? Check this out: http://csat.au.af.mil/2025/volume3/vol3ch15.pdf source: http://csat.au.af.mil/2025/
