Join Date: May 2005
Location: various cities in the USofA: NYC, BWI, IAH, ORD, CVG, NYC
Programs: Former UA 1K, National Exec. Elite
Posts: 5,487
Upgrade to BF gets you the third bag.
Now the question is if you pay to check a third bag and then get upgraded at the gate (ordinary F), do you get your money back? (I assume the answer is no).