From the comments section of youtube:
Quote:
It's a passenger plane filmed in the afternoon with a low sunlight...The atmospheric refraction let both the plane and the chemitrail seem yellow. What occures to be flames are the same, refraction of sunlight in moist air..An Airplane flying against the viewer will look as it's going straight up, and the opposite when it's flying away. (Excuse for my bad English)
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As good an explanation as any.
(filmed 2/11/2011 in Germany, BTW)