It's true that some planes fly on leaded fuel, but commercial airlines generally do not. It's only piston engine planes that fly on leaded AvGas, all jet aircra

It's true that some planes fly on leaded fuel, but commercial airlines generally do not. It's only piston engine planes that fly on leaded AvGas, all jet aircraft including tubroprops fly on fuels like Jet A (https://en.wikipedia.org/wiki/Jet_fuel https://en.wikipedia.org/wiki/Jet_fuel)