For what it is worth, the tool provided above does not allow checking availability on AA, and several other carriers. We've put up a new tool patterned on the old Carlson Wagonlit tool we used to provide as a front end to ITN's old database here at http://flyaow.com/classamex.htm

Multi-city version is here: http://flyaow.com/classamexmulti.htm

It works correctly for AA as of right now.

Cheers!