Originally Posted by bggale737
BTW, i believe my visa is expired. but does this matter for domestic flights?
I just saw your edit. While an expired visa in your passport does not really represent a problem while flying domestically (your visa is unlikely to be checked), it does present somewhat of a problem for you anyway because an expired visa would mean that you are in the US illegally. That can cause you all sorts of problems including possible deportation or being banned from entering the US in the future, either for a few years, or in really bad cases, for life.
Needless to say, this is not a situation you want to be in. I would check whether or not your visa has indeed expired, and if it has, I would find out how to get it renewed. This may involve going back to Korea for a while though, I'm not sure of what the procedure is nowadays.