There's a single system of governance for the port authority. However, within each port authority there are individual arrangements and different arrangements with terminal operators and with individual businesses based on the business model of each port authority. Some port authorities completely operate their own terminals and their own wharves. Other port authorities will lease to an independent commercial operation, in which case that operation pays lease rates back to the port authority.
On November 18th, 2014. See this statement in context.