Originally Posted by mitchmu

The biggest issue with the sCO UG processing methodology is that they are far less likely than sUA was to process a UG request in advance because they are more focused on keeping those seats open then selling them at a discount to anyone who will take them. Then there is what appears to be a very manual and inconsistent process for clearing pax on the waitlist in the 20 minutes or so before departure. In my recent experience with this process, my companion was not given an upgrade when she was supposed to have been given one. I only discovered this because I confronted the gate agent when I saw that my companion was still languishing as #1 on the wait list while 1 seat remained open, just a few minutes before door closing. The gate agent told me that she told the other gate agent to upgrade my companion, but that "he forgot" to do it. In 800,000 miles over 10 years with sUA, I never once experienced such unprofessional nonsense. So, I don't know the answer to your question about "passing over" people but I do know that this sCO methodology produces outcomes that are far less desirable than what I experienced under sUA.