Originally Posted by
LateralFlyer
I can assure you, regardless of the phase of flight, a Captain will be held responsible for what takes place regarding said flight. This includes before, and during the boarding process.
Now it's even before! Does that authority vest when he wakes up in his hotel room?
And I agree with you: if the company says a person is authorized to ride on their airplane, the captain will be held responsible if he disallows it.