Originally Posted by steve32
...Does the re-ticketing each segment of the whole itinerary also kick in when trying to upgrade a cabin from the Economy I might go with to optimize the timing to business class that got more availability later?...
Not sure what you mean by "re-ticketing each segment", but if you want to know if a class change (after ticketing) requires a reissue the answer is yes, although the bookings not involved in the class change 'hold', in other words, you do not lose them.