Originally Posted by
flyerCO
Those BP would be issued by BA. AA may have you flagged as SSSS, but since BA is issuing the BP, you have no way of seeing it till BP is issued by AA.
When an AA flight's passenger is flagged for SSSS on the AA-operated flight, BA's not necessarily able to push out the boarding pass for such passenger's AA-operated flight out of LHR. Even when the BA and AA flights are all on a single ticket itinerary.