Flight froM EU via LHR to US (incl. change to AA in US). At T-24 only first segment available for OLCI. Will each segment show up when exactly T-24? Would it be possible to do the OLCI for the AA segment before the others? (well not so important as it seats could be reserved for free in advance, but where to get the AA bording passes airside in LHR?). Do all segments need to be OLCI-ed in order to have the luggage labelled to the final destination?