Originally Posted by
yonatan
I'm in the middle of a multi-day itinerary that had me flying on a partner airline followed by two onward segments on UA. One partner flight has not yet posted although the next segment (on UA) posted promptly as soon as we landed. ...
UA flights are generally posting in hours of landing (or less). Most partner flights still take days. Posting is requested by the operating airline, not UA.
Originally Posted by
yonatan
I'm considering crediting the upcoming segment (not yet flown) to a different FF program. If I change the ff number at the time I do OLCI for this last UA flight, is there any risk that the unposted segment that I already flew will also get credited to the other program or are the changes made at OLCI strictly prospective?
Yes, there is a risk. Any outcoming is possible as we don know at what point in the process the determination is made and posted experiences have shown undesired outcomes. The general recommendation is to make no changes until flown flights have posted.