Originally Posted by
onuhistorian0116
There is no reason AA shouldn’t check the documents at the originating airport, just to avoid unnecessary situations like this.
In the OP’s case, there is a very good reason for AA not to check docs: AA wasn’t operating the international segment (since they don’t fly LAX-ICN), so they’re not responsible for the document verification. Since the OP hasn’t come back to say who the operating carrier of the international flight is and other crucial details, this thread is pretty far into speculation.