Posted on Facebook, apparently from yesterday, maybe Montana.
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Looks like one engine is out. But there's a faint trail coming from the port engine. What might that be? Residual fuel leak? Aerodynamic? Engine is just on the lowest power setting?
Yeah, if it is marginal contrail conditions, then and EGT (Exhaust Gas Temperature) of a few degrees higher could mean the mixing line never goes though the water supersaturate region, and contrails will never - or barely - form.
It's a pity there isn't a longer video where you could see if it came back on, or if the other one went off.
Hmmmm . . . Have never seen this situation before. . . Probability of this is rather low. . . .
insufficient data
The observer is to blame, but the chemtrails activist community has not sought to apply the tech which could resolve many of these questions:
https://www.metabunk.org/threads/100-14-Years-of-Chemtrails-Comments-and-Suggestions
Following your links Jay, i wound up at this page: Contrail pictures of three engined airliners
In many of these pictures the center engine is not producing a contrail.
Or not appearing to at least. In several photos the contrail would be off the side of the photo, or lined up with another contrail.
It does not seem like there's a great practical reason to have three engines though. I wonder if the third engine was treated significantly differently to the main two.
http://en.wikipedia.org/wiki/Trijet
Sorry, but they would not do that. If an airliner has three engines then it needs the thrust from all three for normal operations.