Maybe so with 175. Many of the 93 passengers were shifted onto it from other flights, though, and they're included. So it's people who bought tickets themselves, and people who were transferred onto the flight at the airport, with only Bingham missing.
True, although transferred pax would be revenue standbys and flying on tickets which would be confirmed. Their fare category wouldnt change on the printout. Is there anything to suggest that Bingham was flying on buddy pass?
There were only 37 people, so its not like there wouldve been more than 1-2 nonrevs. besides him.
Also I compared the fare categories of all UA 93 pax and there is no additional one other than ET, BF, BM, B, M, O, S, which all appear on UA 175.
So, I dont think there were any nonrevs on the list.