Nope, doesn't work that way here GMAN.
I can go, but I can only see if they exit the concourses heading to ground transport. There is one exit spot for that which would cover all except for one terminal... If they transit, I need a ticket but could def be right at the INT exit/customs point.
To go onto INT or any concourse, requires a boarding pass, trust me. And if I could find a cheap flight for today, I would even do that, but CHEAP is the operative word, lol.
If somebody can spot a cheap one way ATL to nowhere/anywhere, let me know. Soon.