So the Airlines are not working on mass.
So its just cargo and military/science using air space. Hmmmm? The vapor trails or 'CONTRAILS' as they are known from Airlines used to be almost like a permanent fixture in the sky as thousands of Airline planes traversed the world at every minute of every day.
Contrails (/ˈkɒntreɪlz/; short for "condensation trails") or vapour trails are line-shaped clouds produced by aircraft engine exhaust or changes in air pressure, typically at aircraft cruising altitudes several miles above the Earth's surface. Contrails are composed primarily of water, in the form of ice crystals
After the 9-11 incident of every plane being grounded due to the planes used in the attack. A scientist did a few tests on the solar impacts on earth while there was no contrails in the sky. And well... precipitation was increased significantly because of the airline Contrails not reflecting the solar rays from the sun. Well imagine its not just the USA but the pacific and every country not having any contrails reflecting and impeding the solar evaporative system on the earths oceans and lakes.
So that means that the sky fills with more water than usual.
Where does that water go when the clouds get full enough of water and hot and cold air meet in the trade winds trajectory.
Thats right Rain.
And lots of it.
Just a theory...
Plausible but mostly theory.