Originally Posted by Seat1A
C is a special class, so you have to request it. if you don't request a specific class, you'll get a listing of all standard classes. if you want C (or X, R, etc), you have to request it specifically, and you'll get just that. just like the availability tool...
Even in native SABRE C and X inventory must be specially requested, either individually or under a special code showing all AAdvantage inventory.