The objective of the management in a liner operator's corporate plane is to achieve the best utilisation factors of the container spaces or slots available on-board the carrier's own vessels. The revenue in increased by the volume of the goods carried. If slot space cannot be bound in the carrier's vessels, the carrier may use "vessel sharing arrangements" (VSA) with other carriers under which slots on-board vessels are reserved for fellow carriers. The VSA arrangement can also be called a "slot sharing" arrangement.