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Hi, doubt very much that its an aircraft..if it were f/18's or even commerc airline and is cruising as high as you say, you would still detect movement and also, if it is that high 10-15 klm you wouldn't be able to seperate the red and green wingtip lights from each other..and the nav lights on most planes i have flown blink similtaneously..at a guess i'd say a setting star..
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