Originally Posted by
RobOnLI
Interesting. That's never been a rule of SDC. I wonder if United is moving to Delta's system which only allows SDC on the same day but in first class allows SDC to any open seat (assuming it's at least J1). Personally I hope not. I much prefer United's method.
Also, how do you know you can SDC to D or C class from P? The options that came up showed you the booking class and you looked at it? For my SDC it only showed non-stop flights with my fare class open (but I was booked in coach and hadn't been upgraded yet).
-RM
It shows fare classes either when performing SDC on website or after you do it on the app. At the very least I could try to get into fare class F or J and net some more PQMs.