Originally Posted by
irmster
dus-lhr ba 943
lhr-las aa 6182
Just as I thought. BA created one PNR for BA 943 and a different one for BA 275 (AA6182).
You will (well should) be able to check in for BA 943 in MMB. The correct PNR for this flight will be the one where in MMB the LAS flight is displayed as a codeshare OR where you can select a seat (if eligible)/play with other features. Usually, you can't access any fatures in operational PNRs (that will be the one created for BA275/AA6182); however you should be able to check in online as well.