The passengers on the plane were a 'captive audience'. [=the passengers on the plane could not leave and had to listen to what was being said]
Enemy forces took/held them 'captive'. [=took or kept them as prisoners]
The 'captive' soldiers planned their escape.
(..) My Lord Greyjoy. I see you've finally learned how to address your betters. What do you want? I was brought here a captive. You were here the day I was taken. I'm the one who took you. What of it? Let me serve you. (..)2012 TvShow: Game of Thrones Title: The Old Gods and the New Season: 2 Episode 6