If you have money, you’re flying a jet or a turboprop, burning jet fuel (kerosene) which contains no lead. Only the smallest private planes run on piston engin

If you have money, you’re flying a jet or a turboprop, burning jet fuel (kerosene) which contains no lead. Only the smallest private planes run on piston engines, whose owners don’t really have money to “fix it”, especially because FAA regulations for certification of new planes and engine designs make everything cost about 10x what it should.