Thank you - I was wondering how long before someone would point out that, if it was say Y2, the airline might not want to give you that seat. I agree, but absent that situation, I think it is bizarre to reject a voluntary downgrade if there are plenty of seats available. The only reason to deny it should be a yield management decision.

The rules clearly provide for the required inventory to be requested, (with, I would presume, an assumption that it will be made available unless yield management is holding out to sell those Y seats).

27N REQUIRED INVENTORY NOT AVAILABLE
28N ---------------------------------
29N .
30N IF THE REQUIRED RTW INVENTORY IS NOT AVAILABLE, IT
31N MUST BE REQUESTED USING NN.
32N .