Originally Posted by ExpertFlyer Voice

In the case of AA, yes, as it is the only tool that allows you to not only see the exact inventory values of all AA award classes (Z,U,T), but all upgrade classes as well (C,A,X,R).

For a list of the award/upgrade classes and their definitions click here: http://www.expertflyer.com/sessionlessClassList.do

For an example screen shot of what the results of an Award & Upgrade search on ExpertFlyer look like click here: http://www.expertflyer.com/screensho...rd-upgrade.jsp

-EFV