This may be my imagination, but I find that I never get OP-up if I bug the gate agent about it. I do BELIEVE that some gate agents do judge if you are upgrade-worthy by the way you are dressed. So if you are in shorts and flipflops, and you present yourself to the gate agent asking (begging/demanding) for favors, then it may work against you?

Ya, there are a lot of Asians flying intra-Asia. :-)

I think we agree that there are no (official) OP-UP procedures at Delta?