what do you think the goverments really doing with those jets when there flying over and realising that gas..?

Question

smoke and or clouds if you dont see the jets doing it just look in the sky any given day

Answer 1

That is called a "contrail", for condensation trail. When petroleum fuel, such as the kerosene which is jet fuel, is burned, one of the products of that burning is water. At a high enough altitude, such as the ones jets fly at, the air is so cold the water droplets in the exhaust freeze almost instantly. The "smoke or clouds" you see is nothing but ice crystals. A pilot.
I should point out that the altitude high enough to create this cold temperature is usually above 40,000 feet where military planes fly. Airliners generally stay around the 35,000 foot level, which normally is not cold enough to create a contrail.

Answer 2

Clean the air by using gas with lesser toxins.