I agree with Leadsled. There are few manufacturers in the world even today who routinely produce AGMA Class 1 gears for aircraft service. It used to be a black art - very, very skilled tradesmen were needed to set up and run the machines - which were Gleason gear hobbing machines, ANCA tool and cutter grinders and CMM’s.
These days there are gear measuring software packages for the CMM’s and they integrate directly with CNC gear hobbers. But to my knowledge, now probably out of date, it is still a black art and the mating gears have to be matched as a set. Each gear is still slightly different and you need to “tune” the hobs and grinders based on the results of your CMM analysis.
As for automotive and industrial gears - easy peasy because they ain’t Class 1. Also be aware that turbines don’t (I think) produce the torque pulses piston engines do.