Making Rain

I heard today that airplanes cause precipitation. Perhaps now we have our answer to drought? I didn't grasp all the intricate details of this, but prop planes, at just the right altitude and temperature, can cause ice crystals to form in clouds. I guess if you get enough of those, you're going to have precipitation! The odd thing is that although the plane is relatively narrow, and occupies a small space, the resulting precipitation frequently covers a wide area. Now I guess we just need to learn to control this effect and we're all set.