Also be aware, lots of people will tell you otherwise and none of them will be in uniforms, that even if your state exempts you from needing a special endorsement on your drivers license for air brakes it is an 'equipment issue' and it is NOT covered by drivers license reciprocity.
However, it's kind of like speeding, you may get away with it for decades, or you might not.
I know for example PA and TX require an air brake endorsement, ditto all of Canada.
I know this because I had to help out a friend a few years back when he got stopped in Ontario in his US plated M/H and they wouldn't allow him to proceed without a 'validly licensed' driver. I drove him back across the border at Niagara Falls where he got back behind the wheel.