Originally Posted by
mherdeg
If R is not available: may not waitlist new upgrade at T-24. It is technically possible for an agent to waitlist you within T-24 with an instrument but policy says no and it's technically challenging.
If R is available: may immediately confirm new upgrade at T-24. Usually may call and confirm an instrument-waitlisted upgrade by calling, occasionally agents and FlyerTalk posters will chide you for 'queue skipping'.
+1. This is consistent with my experience. If the agent cites the (correct) policy that they are unable to apply RPU/GPU, HUACA. You will find someone who will do so.