Originally Posted by
bmr12
Nope. I believe you can only apply an RPU without upgrade space available outside of 24 hours. No waitlisting with an RPU inside of 24 hours.
However, were there to be R availability on another flight, I imagine you should be able to get the RPU cleared immediately on the new flight, right? (at least that's how it worked with a miles upgrade when I flew EWR-SEA earlier this year and SDC'ed onto a flight w/R=1)