After I had the problem that I mentioned in the previous post, I did a little experiment. After I checked in and had my boarding pass from the front counter, I approached United employees at the gate desks or service desks. All tickets were not full-fare coach tickets, but the boarding pass said "Class-Y". I asked, "This says Class-Y; is this a Y class ticket?" I got three yes, three no. The explanations were not particularly inconsistent, but 1.) there was some confusion among the employees, and 2.) there was a clear semantic problem with the designation.