** Shares of U.S. cruise operators rise in premarket trading after oil prices fell following the U.S.-Iran interim deal

** Norwegian Cruise Line NCLH.N up 2.4%, Carnival Corp CCL.N up 2.5%, while Royal Caribbean RCL.N up 2%

** Brent sank to its lowest since March 2, the first trading day after the initial U.S.-Israeli strikes on Iran, while WTI was at its lowest since March 4 O/R

** Rising fuel costs had cast a gloom on the sector as the attacks on oil and transport facilities and disruptions to energy flows through the Strait of Hormuz

** YTD, as of last close, NCLH and CCL fell 11% and 2%, respectively, while RCL rose 8%