I would think the GA's would appreciate this as it's a quick way for them to tell what fare was paid (i.e. like for questions on whether or not someone can upgrade, etc). Years ago I inquired about an op-up on a flight from IAD-LHR when I knew C was oversold... I was in NC class.. When I asked, the GA took one look at my BP, saw the NC, and said "this ticket has already been upgraded" and handed it back to me. If it's not printed they have to look in the computer. A minor point, but strange to me that it's not on there when it's been printed on BPs at the airport forever.