Well, as stated previously...I'll may not be the sharpest knife in the drawer (but close, I hope
), and maybe that's why I'm still confused.
The FAR's say that it is commercial flying (and requiring a commercial certificate and a class 2 medical) if you fly passengers or cargo for compensation or hire or act as PIC for an airplane being flown for compensation or hire. OK, got it.
The FAA has also said that when CFI's are flying with students, the students are NOT passengers and vice versa. OK..got that one to.
The FAA has also said that when being paid for providing instruction, a CFI is being compensated for teaching, not for flying...plus, as noted above, the student is not a passenger. OK, good. Still hanging in there.
And since the CFI is not being compensated for flying, but rather for instructing, the FAA has said that to act as PIC as an instructor, the instructor is only exercising private pilot privileges since it is not a commercial operation and thus requires only a Class 3 medical. Right..got that, too.
So if the CFI is not carrying a passenger for compensation or hire, nor
flying the airplane for compensation or hire, nor exercising commercial pilot privileges...how can it all of a sudden become "commercial flying" just because the CFI happens to fly for a 121 or 135 operator?
Now, I can see the individual 121/135 operator having their own rules...but I just cannot see how the FAA definition of "commercial flying" can change because of the CFI's employer.
FWIW...I'm prepared to be properly lashed and educated.