AvGas (which uses TEL) is used by general aviation exclusively.
But it isn't. Those planes aren't aren't fuelled by AvGas. Their engines use JetA (basically kerosene) because they've got a turbine inside like those turbofan engines which look so visibly different, however their turbine powers the propeller rather than a set of fans to drive more air through the engine and produce thrust that way.
The categories (for non-military use) are generally Scheduled or Air Transport (any time you buy tickets for a flight, that's the category, you don't know or care who is flying, you paid for the journey between a specific origin and destination at a specific time; a FedEx plane is also Transport), then Commercial (not Transport but somebody is getting paid to fly aircraft, maybe it's crop spraying, TV news copter, police, or just another TV priest being flown around in his private jet), and only if nobody was getting paid is it General Aviation.
If your cosmetic dentist can afford a brand new Vision Jet so that he can live 100 miles away and fly in to do $5000 appointments without sitting in traffic, that's General Aviation. The authorities don't care that he's getting paid to be a dentist, he's not getting paid to fly his plane.
If your airline uses a relatively tiny PA-42 to get customers to an obscure but important airstrip with maybe 3-4 passengers per day that's still Air Transport.
On the other hand if some oil sheik owns their own A320 with their own custom decor and has a team of pilots to fly it wherever they want, that's still only Commercial, not Air Transport because nobody is buying tickets, it just goes wherever he wants.
Don’t confuse the commercial certificate[“license”](which is required to be paid for flying) with commercial operations (typically holding out to the public for air transport).
And by people who don't want to ever have to clean or rebuild a carburetor in their small motors. It's been an exceptional motor-life-extender to my chainsaws specifically.
which is the one used for commercial aviation.
Then there is the elephant in the room nobody wants to talk about, the military which is using the 'JP-X' variants all over the world,
some of them even for their cars and trucks, because, hey, it's just better Diesel, why would we stock different fuels if we don't have to?
What a logistic nightmare!1!!
It's just something I won't do.