Originally Posted by
sannmann
Yes. Call United and ask to waitlist for the premium cabin on the first flight, since you've booked a saver business award. Do not use the term "upgrade," as what you're asking to do is not upgrading but instead waitlisting for the cabin you paid for.
+1
And just to further clarify, you need "I" inventory on STL-EWR to confirm into the front cabin.