JFDee
Senior Member.
And I am just supposed to believe you on this? How about a source?
Allow me to return that suggestion regarding your original claim "no persistent contrails in the nineties". If you expect references, you should be able to to provide some yourself.
I think everyone around here is aware of the shortcomings of personal memory. I wouldn't trust myself with such absolute certainty when it comes to things that were not actually relevant in my earlier life.