See also Contrail in Wikipedia
September 9, 2010
Contrails forming a "Y"
Yesterday we saw these vapor trails against the evening sky. We often see contrails left by planes flying over the mountains. 
2 comments:
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They are not contrails...
ReplyDeleteResearch it.
http://www.chemtrails911.com/
I have good reason to believe they are contrails. From our deck we often watch planes fly over the mountain, leaving trails that often look like these. And I've flown over these same mountains in jet planes. We reside under the flight path from Dulles Airport heading west.
ReplyDeleteHowever, contrails are not necessarily harmless. The article I linked on Wikipedia explains how they may contribute to global warming.