No, commercial airplanes all use unleaded jet fuel. But the small, 2 and 4 seater general aviation planes you see are almost all using 60-year old engine design

No, commercial airplanes all use unleaded jet fuel. But the small, 2 and 4 seater general aviation planes you see are almost all using 60-year old engine designs that run on leaded fuel because the FAA doesn't want to devote time to approving new engines for general aviation.