The first of his episodes for the 1960s-set, airline show began filming Wednesday. They are expected to air later this fall.
"Visnjic will play a Yugoslavian diplomat torn politically between his communist background and the freedom and opportunities he's afforded in the west," ABC said in a synopsis. "He'll face a wrenching emotional dilemma when he finds himself attracted to Kate and their romance ends up being more complicated than either ever imagined."
Starring Christina Ricci, Margot Robbie, Michael Mosley, Karine Vanasse, Mike Vogel and Kelli Garner, "Pan Am" is to premiere Sept. 25.
Visnjic, a former cast member of "ER," will also be seen this December as Dragan Armansky in the feature film "The Girl with the Dragon Tattoo."