Originally Posted by
JJeffrey
Things can get very tricky when it's a separate ticket on another carrier that a delayed AA flight has caused you to miss. In these cases, you'd have to find a very helpful/knowledgeable agent (most likely at an AC) that was willing to liaise with the other carrier to get you rebooked.
Unfortunate, but not surprising. Apparently, there is a "Global Support" team at major oneworld stations.
https://www.oneworld.com/global-support
Maybe a proactive agent with "problem" carrier could send a message to this team if one is booked in separate records to facilitate making a close connection or rebooking missed flights.