I have a return ticket LGA-RSW for two people that was made before I qualified for Silver. In the itinerary, it shows "Request Only" with a checkbox that you are supposed to check, then click "Submit" in order to place your upgrade request. No matter what browser or computer I use, clicking the checkbox and submit has absolutely no effect (and needless to say, I am not on the upgrade list). Anyone have this problem? I called Delta and they suggested there were no upgrades available--which, even if true, given that the return flight shows every seat in first class open, doesn't mean that it couldn't change in the future, no?

Any thoughts appreciated.