The problem is that each airline has their own set of codes for award tickets and that the respective airline computer reservation system simply cannot differentiate each airline and their code.

But under oneWorld...yes there seems to be some sort of uniformaty - U is for Business and Z is for First Class on Cathay Pacific flights too.

But " I " under Cathay is for 'discounted' Business Class seats.

You'd just have to rely on each tickets' remakrs at the bottom of your itinerary!