Originally Posted by
FlyerBeek
One warning: to "un-apply" a confirmed upgrade you generally need space available in your original booking class. This can be difficult if you purchased a deep-discount economy fare.
-FlyerBeek
not an issue if it has not cleared, which since the flight is R0/F0, it will not have
OP will still be in his/her economy fare class
however, the recommendation to "unapply" is astute, the best way to handle this one is to call in and ask the agent to apply the RPU only to the long segment. this can't be done online that i'm aware of, it requires agent intervention.
i used to do this often on LAX-EWR/JFK so that i didn't accidentally burn an RPU/miles on SMF/RNO-LAX.
if/when the long segment clears, you can call again and ask them to extend it to the short segment as well.