> flying is already an inherently expensive, niche hobby. it's cool that it exists at all, but I don't think it would be some enormous injustice to price a few

> flying is already an inherently expensive, niche hobby. it's cool that it exists at all, but I don't think it would be some enormous injustice to price a few more people out. Yes. > a reasonable solution might be to grandfather in all existing engines that are only certified for leaded fuel. as long as the use is non-commercial and/or doesn't exceed some number of hours per year, you can keep using that engine until it dies. once it does (or you want a new plane) you have to use unleaded fuel. I'm not sure that's workable. Apparently a large fraction of the piston engine aircraft fleet is decades old, and the replacement rate is very low. So you'd have a very long transition period. Further, GA is such a small niche market anyway that smaller airports are very reluctant to provide more than one gasoline variant. I think it'd be more realistic to set some date after which sale of leaded AVGAS is prohibited. That's what was done when leaded automotive gas was banned. Those with cars unable to use unleaded gas just had to suck up whatever expenses were needed, or stop driving.