Andrew J,
No - one can hold you captive - except airport officials...
If you think its as simple as saying "Excuse me, I'm getting off, see ya", then you're very, very wrong. Give it a go in a diversion airport sometime and see what sort of response you get.
Don't be surprised if weapons are involved in some parts of the world.
Usually the crew would be more than happy for you to get off. The local officials less so.
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