Originally Posted by
eponymous_coward
As far as I know, SDC needs any Y seat (does not need class of service match). Also, lately, because of how AS changed waitlist processing, SDC from U usually means you're sitting in Y (you don't go straight into F any more, but get stapled to the bottom of the waitlist, or sometimes don't even end up on the waitlist at all).
Yes, I was disappointed last week to find that my upgraded ticket would not transfer to any available F seat anymore, but only those with U availability (I assume it was U) or coach. It was nice while it lasted.
