It's difficult to find a *A F class flight in the US (And even if you can it's a similar standard to Y on Asian carriers). There is no F in Europe and C is not that good either. The airlines involved have so degraded their premium services, despite the fact this is where they make money, that I wonder why anyone would pay the difference from Y. I only use these so-called premium services when on a FRTW ticket. However, given that half of the world doesn't have F anymore, I'm wondering if it is worth it any longer, especially with flat beds in C it seems to me that CRTW is a much better deal these days, especially after the recent fare increases.