Originally Posted by
sierranevada
I just called since I had the same question. According to 1K desk, yes you can use instruments for upgrade. You may not be able to do it online so might have to call.
LAS-iAH-CUN earlier this month, called to upgrade with my remaining expiring RPUs. Agent refused saying bulk fares cannot be upgraded. Eventually all legs cleared via CPU and I donated the RPUs to someone else's trip.
No PQDs for the trip, but RDM/PQM posted.
Unlikely that I will book through UAV again, unless there is a significant financial advantage.