I just recently booked a rather complex award using United miles that includes 2 segments on Air China. On United's website, all looks good. However, if I call Air China to assign seats, they say only the second flight is confirmed, the other is still pending and I need to call United to fix it.

If I call United, depending on the rep, they either say everything is fine, or they say it is pending, waiting on Air China to confirm.

It seems very similar to http://onemileatatime.boardingarea.c...a-award-space/

Currently they are both just saying to wait 24 hours and see what happens, but my confidence is not high. Assuming I wait the 24 hours (48 hours after initially ticketed), and it hasn't resolved, how should I go about getting it fixed, since both airlines just say they are waiting on the other? I guess I'm mainly looking for any keywords I might say that would let them know what needs to be fixed.

Or should I just not even worry about it since United shows it all as confirmed? All other partner flights seem fine (able to assign seats).