Originally Posted by Trotamundo
Trotamundo, thanks.
I have since learned that First = Z and Business = U, but that's not of much use to me because these are hidden codes, that most OW airlines do not make available to the public. I can get AA availability, but CX/BA/IB... appear to be state secrets. Will have to call AA, it seems, something I was trying to avoid. Oh, well.