A few months ago I heard a Flybe Dash 8 being told that it could not depart at Manchester. Controller told him he'd just been passed a message by the company for it not to depart. He then told the pilots they had to return to stand as most of his passengers were still in the departure lounge... I'm guessing it was an airport/Flybe issue rather than late passengers as they made it return to stand even when it was at the hold!