Probably a silly and obvious question, but perhaps you of expert traveldom can offer up something I don't know.

I am booked on UA755 from ORD to SEA tomorrow morning. According to the seat configuration, it looks like a 777-200 WW (according to SeatGuru).

I currently have 22 EQS and 15,342 EQM. I also have 9 segments already ticketed.

My intention when I booked the flight was to pay to upgrade to E+ when I checked in on-line. Seems like a good use of funds to me. When I checked in, however, it offered me a paid upgrade to C. I turned it down and went to choose my seat. The seat selecter would then only let me choose from E- seats (and only a small handful at that). I tried to re-check in, re-select seats, etc. But I could never get it to offer me a paid upgrade to E+.

So now I'm booked in seat 31A. If I go to ticketing in person tomorrow morning, will they let me upgrade to E+? Can I do it at the gate? I don't have status yet but will after I fly my current booked segments. Will this make a difference at all? Anything else you think I need to know?

Thanks in advance for your help. This stuff is all new to me.

bOReD