. customer deposits are subsequently recognized as passenger ticket revenues , together with revenues from onboard and other goods and services and all associated direct costs of a voyage , upon completion of voyages with durations of ten days or less , and on a pro-rata basis for voyages in excess of ten days . revenues and expenses include port costs that vary with guest head counts . the amounts of such port costs included in passenger ticket revenues on a gross basis were $ 459.8 million , $ 442