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Sources

http://www.aviationweek.com/Blogs.aspx?plckController=Blog&plckScript=blogScript&plckElementId=blogDest&plckBlogPage=BlogViewPost&plckPostId=Blog%3a27ec4a53-dcc8-42d0-bd3a-01329aef79a7Post%3a764f0843-3aa6-4b63-a879-13326ce408a2

http://www.aviationweek.com/Article.aspx?id=/article-xml/awx_12_06_2013_p0-643783.xml

http://www.aviationweek.com/Article.aspx?id=/article-xml/awx_12_06_2013_p0-643786.xml