Some comments:
(1)While TSA is supposed to accept GE Cards as ID, there have been posts on FT stating that they didn't--until a supervisor was called.
(2)I believe from posts in the AA section, if you are on an international itn (with the first segment domestic), you are supposed to show a pp to GA when you board the domestic.
(3)I don't bring my pp for an ALL domestic itn. My DL has only my first and middle name's INITIALS, every now and then when I show my DL, TSA will ask to see SOMETHING with my full first name (a CC, for example) [my BP has my full first name].
(4)Aren't AMERICAN INDIAN tribal ID cards supposed to be accepted as ID for all domestic air travel?