I am doing an international trip that starts with a 2 cabin domestic flight and continues on as a 3 cabin international flight. I am booked in C, so obviously I'm covered on the 2 cabin segment. My question is how the C>F upgrade will work on the second segment since I'm already in the domestic F cabin on the first segment. Also, once I'm at day of departure I believe all these segments clear individually. However, which upgrade queue takes priority inside of 24 hours. Can you clear off of either upgrade list? Oh, and yes, I already know that these same flight number flights suck. No choice in this case.