Anyone experience with Credit Shell on AA can tell me how it works. I cancelled my flight to BKK and request for credit shell. I'm supposed to be able to rebook within 3 months. But I went into 'Manage booking', I can't see any credit there. How to go about it??

Normally, you can't cancel or make changes with AA bookings unless they announce. My case is because BKK got political chaos, that's why AA announces that passengers can change or apply for credit shell.