I'm willing to bet that the amount of lead that's put out by aircraft in a year pales in comparison to what was put out by cars, and as a result going after lea

I'm willing to bet that the amount of lead that's put out by aircraft in a year pales in comparison to what was put out by cars, and as a result going after lead emissions from cars was deemed to be the best course of action by the EPA. Also, it's worth noting that leaded gasoline didn't go away overnight. It was still sold for awhile even after the EPA said that you couldn't make cars that ran on leaded gas.