Originally Posted by
jbalmuth
I've found that the single most important piece of information that we can provide has been the most current AA ticket number, taken from AA's most recent eticket email.
I second this advice, having the latest eticket number has saved me a number of times, most recently in AMM when I tired to check in for a RJ flight. The record locator didn't work and they couldn't find my reservation at all until I produced the ticket number.