Aussie Bob, the people here know aircraft and aerodynamics.
They know that the technology to spray 20 million tons of sulphates a year into the stratosphere at 60000 plus feet, within 30 degrees of the equator as proposed by Prof David Keith, has not been developed yet.
They know that current aircraft cannot do this.
They know that any aircraft that could do this would have to purposely designed and test flown.
They know that the size of such an aircraft would mean it development could only be done by certain manufacturers and would be difficult to keep secret, as the mission is not military in nature.
They know that contrails are not chemtrails.
They know that contrails persist in the right conditions.
The know that chemtrail believers have confirmation bias that only allows them to see only the small slivers of truth in their case, such as a PROPOSAL to spray sulphates into the high stratosphere to combat global warming, and ignore the voluminous science of persistent contrails.
They know that chemtrails believers simply make stuff up when it suits them, or alter YouTube videos to use as click bait for their channels.
They know that most chemtrail believers don't know the difference between climate and weather. One is global and the other is local. I suspect you don't either.
They know that you cannot put large quantitities of aluminium, barium and strontium into aircraft fuel and expect your engines to survive.
Most of all they know that the rationalisations that chemtrail believers are required to concoct about pilots in order to have their lunatic theory make any sense are total, utter fabrications. Pilot are not under confidentiality agreements, or too scared for their jobs or lives or make too much money to speak out against the requirements of "they" to make us spray our own families.
Don't tell us what we don't know.