Originally Posted by johnrg

I'm in the same situation for an upcoming flight. I'm cleared into NF, but my wife is waitlisted for XF on one segment. I asked if IM could open up a seat while on a call with UA a few weeks ago. The agent put me on hold, came back a minute later and said "there's a good chance it will clear, keep checking back". I'm planning to call and try again soon.

In case you don't clear, others here have said to request the FFCC (full fare class change) waitlist upon checking in at the airport. Apparently this list is supposed to be cleared first with paying customers ($ or miles), followed by UDUs. My flight is in three weeks, I'll be back to post the results. Good luck!