"Skidder" wrote in
:

That's correct, and I read the FAR the same way. But it puts us in a
loop because the entire focus 61.57 is the currency required to carry
*passengers*. My point is, another pilot with a full set of controls in
front of him is not defined anywhere as a passenger. Furthermore,
nothing says that anyone present in an aircraft that only requires one
pilot, has to be considered a passenger.

I don't understand why you think that a person sitting in the passenger's
seat who happens to hold a pilot's certificate is anything different than a
person who happens to not hold a pilot's certificate.

If he holds an ATP does that make the flight part 121 airline transport?