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This looks like a plane, flying away from the camera considerably higher than the helicopter (somewhere around 15,000 to 25,000 feet), that briefly creates an aerodynamic contrail.
The plane that seems to fit best is LA330, a two engined A320, which was reported to be climbing through 20,000 feet at that exact visual position at 14:01:39. It was actually 65 miles away, not 35-50. This explain why it was not seen on radar (the actual plane was on radar, just not where they thought it was) ...