Good comments so far... Definitely include the item about some fares being sold and market as first class, but the airline treating them as coach in the situation of cancellation or misconnect... in particular searching for first class and being presented with a first class fare which is a -UP fare, but nowhere does it state that it is actually an upgraded coach ticket.

It will be interesting to see how airlines react with the DBC going up to 650... I wonder if they'll adjust their algorithms to not oversell as much.