What lawful order? Lawful orders arise out of unlawful behavior. Pray tell what was the unlawful behavior?
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It appears he was instructed, as authorized by the Captain, to deplane, and he refused to do so. If the captain’s order was lawful, his refusal to deplane was unlawful.
The captain also has to have a reason to request a passenger leave. That reason has to be one of those listed in the contract outlining when a passenger can be removed once they have boarded. To make room for non paying crew is not one of those reasons.