TMZ Sports has obtained video of Pacman Jones in a full-on FIST FIGHT at the Atlanta airport -- showing the NFL star retaliate violently after he was attacked by an airport employee.
Cops told us the altercation began when the employee -- Frank Ragin -- made a gesture toward the NFL star as he was walking through the airport with a female companion.
You can see in the video ... Pacman (real name Adam Jones) calls out the guy and confronts him.
Ragin -- still wearing his orange airport vest -- goes after Jones, initiating the fight.