Clarification: Only piston aircraft require leaded fuel. Which is unfortunately a pretty big part of the general aviation market, but similarly sized turboprops do also exist (though are more expensive) and it doesn’t apply to modern commercial aviation at all.
Clarification: Only piston aircraft require leaded fuel. Which is unfortunately a pretty big part of the general aviation market, but similarly sized turboprops do also exist (though are more expensive) and it doesn’t apply to modern commercial aviation at all.
There is an increasing number of piston aircraft that have Diesel engines, and run on jet fuel.