I have seen youtube videos of trails turning on and off behind clouds, (on behind cloud, off in blue sky)

mask what they are doing

You saw it therefore it wasn’t masked.

Make sure your own shit adds up first.

All the “extreme levels of aluminum” I have seen turn out to be very normal levels of aluminium – the people worried about them seem to not know how much aluminium there is around and therefore are mistaken when they say levels are high.

Lastly the conditions for clouds are often the conditions which also result in contrails forming – contrails are ice crystals, and so are cirrus clouds. So it is reasonably common, and quiet logical, that you get contrails forming in exactly the same areas that cirrus clouds form.

It does not always happen of course – there are numerous factors that decide whether a particular aircraft will generate a contrail at any given time, but there is a similarity in the conditions that goes a long way to explaining why the correlation between contrails and clouds is often noted.

Thats just a few things I care to mention, but everything doesnt add up. It would make perfect sens for them to drop chemicals into the ozone layer for many reasons, they dont want to acknowledge it as they dont want to be accountable or high rates of cancer etc etc etc its a big can of worms.

Keep your minds open and take in as much as you can.