The following was emailed by someone who wishes to remain anonymous, on January the 27th, 2013 and appears to show an aircraft without wings in the footage of a plane spraying a chemtrail. What appears to be an orb-like object was also filmed recently in Taranaki by Jonathan Done on January the 12th, 2013.
Aircraft without wings have also been seen spraying aerosols, suggesting advanced technology is being used by stratospheric aerosol geoengineers. Graeme Bull of Auckland reported seeing such craft spraying aerosols from about 10,000 feet while he was skydiving.
Could this be what is making the black lines or shadow effect sometimes seen under, beside or even oddly in front of trails here and overseas.
It could be the position of the sun in relation to the trail and surrounding cloud. What could be being see is a shadow of the trail against neighboring clouds, perhaps revealing how dense the aerosol is.