Originally Posted by
TomA
D and Z are the actual number of C seats available as they align with the seat map (4), but once those are gone, UA will sell you a J or C seat and bump someone else into F in order to make another C seat available.
Does that seem right?
I would guess it might depend on the flight. With large J cabin, UA might count on a significant number of passengers not showing up for the flight (J passengers probably are very likely to swap the flights, be a bit late, etc.); in that case, there might be no bumping up planned.