Called to find flights with GUC inventory in December (MCO-LAS-MCO). Agent looked high and low. Found inventory on MCO-LAX-LAS-ATL-MCO. Only the LAX-LAS leg was wait-listed. Great. Had another, unrelated issue and forgot to ask for seat assignments. Bad move...

Hung up. Went online to choose seats. No Upgrades! Called back. Explained what I had been told. "Sorry sir, but there is no RUC inventory on those flights, but you are wait-listed for the RU on each flight."

The moral of the story: Make the agent tell you the seat assignments to confirm the inventory is really there.