I should mention right away that I am neither an AC apologist, nor a statistician. But looking at the numbers, it seems to me that all the surveyed carriers have scored between 665 to 719 points.

So basically all the airlines scored within a 54 point range over 1000 points, so 5.4%. Doesn't this say there is not much difference between the carriers, and the top is only marginally better, and the bottom only marginally worse than all the rest??