Originally Posted by anabolism

I suspect (and this is just my own guess) that perhaps the problem is the split between CX and AM; because AM is issuing the upgrade, CX won't take over the reservation and re-issue the entire ticket. Hence, AA keeps seeing the reservation in a funny state. That, together with what might be a particular RTW agent who is using the BA rule against upgrading a BA segment of an RTW as a general rule against all upgrades except for AA sectors.