I am aware that a contrail can last a long time under certain conditions of humidity, temperature and altitude. I am also aware that it is a relatively rare occurence.
There is a website in which airline and military pilots submit their breathtaking photos of certain remarkable con trails.

I am also aware that Mario is not concerned in the least about my observatinal skills but rather relishes ad hominim rhetoric.

...

Conspiricy = to breath together

Indeed we are all breathing it together.