Why is the issue of payment raised here? This seems superfluous and even misleading to me. Passengers often do not pay for travel, that is why people talk of "revenue passenger miles". And a flight attendant is not considered a passenger because she or he is part of the crew, not because she or he does not pay; when a flight attendant off-duty flies back home for free, she or he is a passenger.
I think I'm going to be bold and correct this.