Despite mass cancellations of voyages, Miami-based Carnival Corporation, Royal Caribbean Cruises Ltd. and Norwegian Cruise Line Holdings — the three largest cruise companies — have raised enough cash to last at least 10 cruise-less months, according to analysts. The fourth largest, MSC Cruises, is privately held. But will people want to cruise again after thousands have been infected with COVID-19 after cruises and dozens have died? That’s the million dollar question, said Rockford Weitz, director of the Fletcher School Maritime Studies Program at Tufts University. Travel agents say they are seeing a steady stream of bookings for 2021, according to...