About six weeks ago I covered American’s new domestic first class upsell program where they e-mail non-elite flyers with offers to sell first class seats if still available the day before departure.
These upgrades are after elite upgrades the day before departure, so they don’t trade off with elite upgrades that are confirmed at least a day in advance however they certainly can trade off with available inventory for elite upgrades closer-in. We now know that in the event of a flight cancellation they have a higher priority than elite upgrades.