Sometimes, however, they are just full. You may have checked M class, but remember all those MP members and *G types who have booked their family holidays on cheapy tix or award tix and persuaded the agent to put all four of them into E+ etc...
In all likelihood you'll be ok provided you call again in the week running up to the flight as people will have upgrades clearing etc.
eta: Welcome to FT!
[This message has been edited by Wingnut (edited 06-19-2003).]