Originally Posted by
choijw
What happens when the passenger doesn't have a valid visa and (s)he is sent back? I'm pretty sure neither the passenger nor the (refusing) arrival country will pay his/her way back.
The airline has to pay to transport the person back. In theory, this should NEVER happen unless the passenger has a forged passport or visa, because the airline isn't going to let you get on the flight without checking your documents. Also, the passenger more than likely has a R/T ticket so he has already "paid" his way back.