If more ticketholders arrive at the airport than the plane can carry the airline will refuse to board some passengers (colloquially known as "bumping" them) and provide them compensation based on the regulations that apply to that flight. Usually in this scenario a carrier will ask if there are any passengers willing to volunteer to be "bumped" before involuntarily refusing to board passengers. If there are volunteers, the airline will negotiate compensation with those passengers, usually in the form of vouchers good towards future flights.[3]