The Port of Seattle Commission approved a 10-year agreement Tuesday that gives Carnival Corp., the parent company of cruise lines Holland America and Princess Cruises, preferential use of two new cruise berths to open at Terminal 91 in April.

The deal -- which can be terminated at any time by either party for the following cruise season -- guarantees that the cruise companies will continue to bring their current level of 420,000 annual cruise passengers and base five vessels in the Seattle seaport through 2018.

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