I'm flying TUL - ATL - MIA next month, booked main classic through my company's travel portal yesterday. I immediately logged in to my account and it was >$300 each leg to upgrade to FC and I was like "F that!!!" It was roughly 2,000 miles each to upgrade to C+, so I was like what the heck. Now when I look again, first is completely X'd out TUL - ATL and all unoccupied seats ATL - MIA are also X'd out - basically it doesn't look like I can now upgrade even if I wanted to pay a usurious amount. There are no upgrade offers when I access my trip, either, which there were prior to me upping to C+. Can you only do one upgrade? I swear I've bumped to C+ and then FC before after booking main. And I really don't think the cabin, especially TUL - ATL, sold out completely and no has picked a seat so they're all X'd out since yesterday. Anyone know what might be up?