Originally Posted by
ShutteLag
and if someone refuses to leave a business(in this case, the aircraft), who is ultimately responsible for extricating the passenger out of his/her seat?
That's the business's problem. They refused to service their customer despite that customer having paid for services. Unless the passenger is violent or, more generally speaking, a threat to others or himself, there's no need in getting cops involved, particularly when the business is originally at fault.