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I live near Luke AFB and this just jogged my memory about how yesterday I saw an extremely low flying 737 which was completely gray (no markings) look like it was going to make a landing at the base. I've never seen a contrail in this area as its all a large no fly zone where they fly the figher jets on routine routes everyday.
.....how is it you think that clouds made up of water can last for hours and hours.....but contrails made up of water can not?