I don't know much about bank ratings, but I do know there is a AAA rating, so I imagine many banks would rather have a AAA rating than a AA. I would like to see a recent listing of which banks are AAA/AA. I tried going to the Moody's website, but it appears I need to register (no thanks).
Note: I am kind of skeptical of the bank ratings. Didn't Citigroup or some other company that just needed a big bailout have a AAA rating until the day the bailout was requested/ordered?