A while back AA flew BOS-MAN (Manchester, England) as a seasonal service. They used aircraft configured for domestic U.S. travel. Since domestic U.S. F isn't up to the standards of international business class, they sold it as single-class economy service. However, those in the know (thanks, FT!) could reserve seats in what would have been the F section of a domestic U.S. flight. If one was on an economy ticket, it was worth traveling from London to Manchester to be able to do that.

So, to the topic of this thread: was that one class, as AA sold those flights, or two?