Originally Posted by
jsloan
OK, fair enough. So, for the optimistic, when an instrument is applied, delaying check-in to the airport would give the greatest possible chance to clear together, but makes it extremely difficult (read: not likely) to keep the reservation from being split if the upgrades don't clear in advance.
Right - I would definitely not let the tag get applied if I don't want the PNR split. It's dicey to find a competent agent, and one wrong keystroke will irrevocably split the PNR.