“On February 23, 2022, the FAA joined aviation and petroleum industry stakeholders to announce a comprehensive public-private partnership to transition to lead-free aviation fuels for piston-engine aircraft by the end of 2030.”
Avgas 100LL is going to be around for a good long period of time. Not a single local airport around me locally has rolled out the new fuel yet so I’m not sure I believe your point about airports wanting it ASAP
Yeah leaded fuel is only for piston engines. I can't actually imagine leaded fuel working in jet engines, even if they can usually take a wide range of fuels.
The FAA got off their butts and approved the unloaded substitute in 2022 and it's starting to roll out.
Airports want it ASAP because the (IIRC) ~20% higher cost is a cheap price to pay to not have to listen to people complain.