As a lowly blue I’ll be choosing seats in CW tomorrow @ T24. At the moment the seat map shows one seat UD on a 744 but I have a domestic connection a few hrs before which would give access to the seats on the main flight. I’m thinking of waiting until T24 on the main flight to see if any other UD seats become available. Is this a good plan or would checking in when the domestic allows check in be a better option?