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Old 16th February 2020, 06:45 PM   #15
curious cat
Critical Thinker
 
Join Date: Jan 2019
Posts: 373
Me: "Contrails NORMALLY appear at SOME 30,000 ft...."

Originally Posted by abaddon View Post
Nope. Contrails may or may not form at any altitude right down to 0, although far more likely/common at 25k+.......
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