Also, note that some agents are more knowledgeable than others about endorsing not being required. A full fare should be no problem, but just to be safe, I'd allow extra time.

(just got the runaround on a RTW fare which is also supposedly "no endorsement required" and an agent who refused to believe it and sent me traipsing back and forth between the airline on whose stock it was ticketed, the originally operating airline for the segment, and eventually back to her. I was feeling patient so I went along for the ride--of course, neither of the other airlines endorsed it, saying it wasn't necessary )