Comment by ne0flex

I've never used anything else other than my passport to travel domestically. Main reason being that when I first moved to the US, I was couch surfing and didn't have a permanent address. When I finally got my own apartment and went to get a state ID card, the experience at the DMV made me not want to return to get a real ID card, so I just use my passport and don't have to worry about whether it's in compliance or not.