I have a CO reservation on a 1-stop flight IAH-SEA-ANC. The res system shows IAH-ANC as A8 D4 F0, IAH-SEA A8 D4 F0 and SEA-ANC A9 D9 F9. Has anyone had any luck getting a "partial upgrade" (the 2nd segment in this case)at EUA time? I am thinking that I will get "left behind" as the IAH-SEA leg is not available. Also, if I don't get an IAH gate upgrade for IAH-ANC (or IAH-SEA) will they do an upgrade out of IAH for the SEA-ANC leg or do I have to try to get in SEA during the stop? Does anyone have any experience with either of these situations?