Originally Posted by
SFOSpiff
I suspect what happens here is that they only advance upgrade enough people to fill a 47C in case of a swap, then fill the rest at the gate if they need to. Though that time (above), the gate upgrades started with about 15 C seats still available.
That's been my suspicion as well, given my own travel experiences and following this thread. Hundreds of posts on the thread, and hardly a complaint of a confirmed upgrade lost to a 74C swap on 664/973, and none since the swaps have become commonplace. A few reports of double-upgrades to F, though.