Originally Posted by KVS
The supported award/upgrade booking classes are different between the KVS Tool and EF, and the exact listings can be accessed via their respective websites.
OP's inquiry appears to have to do more with an AA-specific question, than the broader issue that is implied by the thread's subject...
I'm sorry, my response was a little sloppy. I just meant to note that for AA specfically, the X inventory upgrade information is important.