This discussion goes nowhere if you reject the credibility of anyone you disagree with.
In that case, you also have lost all credibility. And you can say I've no credibility either.
> This is another failed example of 'trust me I'm a scientist'
No, it isn't. There's a large amount of engineering to do to make these work. How are the chemicals deployed? Who designed the deployment mechanism? Who makes the chemicals? How and where are they stored? Who transports them to the airports? Who is in charge of safety should things go wrong? If one of these flights crashes, how is evidence destroyed so it stays secret? Where are these flights based? Who are the flight crew? Why do airlines and cargo flight operators do this work? Is it more profitable than flying passengers and cargo? Or are there secret orders requiring them to work?
Somehow all of these operations must be kept secret.
"Trust me I'm a scientist" answers precisely none of these questions, any more than "trust me I'm Batman" does.
Where are the credible information sources which show theis required infrastructure exists? Because all I hear is "trust me, scientists can do it." Which carries no credibility.