Battle of the Seas: Cruise Lines vs. the C.D.C. Cruise companies and their allies are fighting against rules that have kept U.S. ships from sailing. But experts say controlling the coronavirus onboard is a complex puzzle. Royal Caribbean’s Navigator of the Seas docked at PortMiami in Florida. The company has scheduled sailings out of Bermuda and the Bahamas, while departures from United States ports are stalled. Credit...Joe Raedle/Getty Images April 23, 2021, 5:00 a.m. ET In the United States, flights are filling up, hotels are getting booked, vacation rentals are selling out and car rental companies are facing a shortage because of spiking demand.