Originally Posted by
rustykettel
ETA: I see X7 is also open. So you can buy “Saver” on an underlying refundable fare but all of the Saver restrictions then? At least it should still be eligible for CoS bonus...
I don't think that's how it works. Each published X fare has an underlying booking code. In order to ticket it you need both the X and the underlying booking code. Theoretically they could publish an X fare for Y but they don't.