Originally Posted by
NWAOldtimer
Through AA.com bought DTW-DFW-Buenos Aires-BRC and return. The flights to and from BRC (AEP-BRC) are LAN flights. The outbound AEP-BRC is listed as LAN 4346 and LAN can see the reservation and has assigned seats. But BRC-AEP is listed as AA 7683 operated by LAN (LAN 4347) and LAN does not see our reservation. Many calls to the EXP desk and they insist that NO ONE can see the reservation until at the airport on the day of return, because it is a code share. Obviously not comforting, maybe the reservation is not seen because it doesn't exist.
Some airlines/systems don't create an operating PNR for a codeshare flight under the operating flight number; I've seen this with AF & AZ (Amadeus Altéa). I believe LAN is on Altéa as well. In this case LAN should be able to see your reservation for AA*7683 in its system, and will have an Amadeus record locator that's different than the Sabre-generated one of the AA itinerary. It will not have a reservation under LA4347; the EXP desk is correct in that sense.