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#1
03-28-2004, 04:41 PM
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What is this plane?
I was taking a photo of our frozen 'Bridal Veil Falls' near Valdez, Alaska for a tourist last month ...
& in centering the photo, I was amazed to see this fast moving, silent 'jet'. It moved so fast ... There was no jet stream ... What was this? 
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#3
03-30-2004, 04:42 PM
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I would tend to agree with Dan.
Although any plane can fly without leaving a contrail provided the conditions are right. The contrails or "jet stream" as you called it, is left behind when super heated air leaves the tail pipe (Yep, jets have them too) and mixes with very cold moist air leaving behind ice crystals. If the plane is flying at a low altitude on a dry day and the air temps are above freezing then there would not be a contrail left behind. But again, without a photo it is hard to guess what you saw. DL
__________________
DL ?Whatever else history may say about me when I?m gone, I hope it will record that I appealed to your best hopes, not your worst fears; to your confidence rather than your doubts. My dream is that you will travel the road ahead with liberty?s lamp guiding your steps and opportunity?s arm steadying your way.? President Ronald Reagan
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