At Hartsfield-Jackson Atlanta International Airport, the domestic and international terminals are connected by the Plane Train within the airport's secured area. The few times that I've had international flights out of Atlanta, I've noticed that the wait in the security line tends to be much shorter than the wait in the domestic terminal, which can often be quite long.
So what I've thought about doing is going through security in the international terminal and then taking the Plane Train to my gate. I suppose this may not actually save me any time due to the longer distance from security to my gate, but I'm sure any traveler can understand why I'd rather spend my time riding the tram than waiting in the security line.
Is this something that I can do? Will I be allowed through security at the international terminal without a boarding pass for an international flight? If so, will I need to have the same kind of documentation I'd need for international travel (e.g. a passport) or would the standard U.S.-issued driver's license suffice like it would at the domestic terminal?
Edit for 2019
Due to ongoing construction, there is currently significantly increased traffic at both the north and south domestic terminals. The work is intended to continue for some time. This makes checking in at the international terminal an even more desirable option if allowed.