With the changes in how Aadvanage now awards miles for flying, one of the impacts moving forward will be that "miles concentration" will be among fewer people.

The few people that spend a lot will now earn significantly more miles, while the folks who spend less on flying will earn far fewer miles than before.

With fewer people competing for award seats, how that reshapes the landscape, if at all, will be interesting to watch -- since in theory AA will have to find a way to keep these 'super profitable' customers happy.