I should have said: until commerical aircraft meet ALL fuel economy and emissions standards that old trucks have had to meet in their lifetimes. If your jet en

I should have said: until commerical aircraft meet ALL fuel economy and emissions standards that old trucks have had to meet in their lifetimes. If your jet engine does not have a catalytic converter, it must not fly. What's good for old trucks is good for aircraft. If for airplane burns leaded fuel, it must not fly. If your airplane does not meet CAFE standards, it must not fly without paying fines. Here are a few of the standards: https://www.epa.gov/emission-standards-reference-guide/epa-emission-standards-light-duty-vehicles-and-trucks-and https://www.epa.gov/emission-standards-reference-guide/epa-e...