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It's actually from a 2007 photo of contrails left during an exercise of the Chinese air force practicing high altitude dogfights between F-10 and SU-27 fighters.
http://war.163.com/07/1225/08/40I0FABE00011MTO.html (http://archive.is/ckekT)
Similar contrails were observed during dogfights in WWII:
http://www.telegraph.co.uk/history/battle-of-britain/7881879/Battle-of-Britain-our-finest-hour.html
http://en.wikipedia.org/wiki/File:Fighter_plane_contrails_in_the_sky.jpg
It's actually from a 2007 photo of contrails left during an exercise of the Chinese air force practicing high altitude dogfights between F-10 and SU-27 fighters.
http://war.163.com/07/1225/08/40I0FABE00011MTO.html (http://archive.is/ckekT)
时间:2007年某月某日
地点:云贵高原上空
主角:成都军区“红”“蓝”空军
任务:多兵种联合防空与地面目标攻击
[Translation:]
Time: one day a month in 2007
Location: Over Yunnan-Guizhou Plateau
Protagonist: the Chengdu Military Region, "red" and "blue" Air Force
Task: for combined air defense and attack ground targets
Similar contrails were observed during dogfights in WWII:
http://www.telegraph.co.uk/history/battle-of-britain/7881879/Battle-of-Britain-our-finest-hour.html
http://en.wikipedia.org/wiki/File:Fighter_plane_contrails_in_the_sky.jpg
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