More than 50 cruise lines are suspending operations to and from U.S. ports for 30 days due to the “unprecedented situation” of the coronavirus pandemic, according to a cruise line trade association.The suspension begins at midnight, according to a statement from the Cruise Lines International Association. CLIA represents most of the major cruise lines, including Disney, Carnival, Princess, Norwegian and Royal Caribbean.This follows earlier announcements but affects all major lines, including Princess Cruises and cruise ship operator Viking. Carnival Cruise Line and Norwegian Cruise Line announced suspensions in operations Friday.Norwegian Cruise Line President and CEO Harry Somer said his cruise line planned to resume cruises beginning April 12.”This has been a challenging time, but we hope that this decision will enable us to focus on the future and a return to normal as soon as possible,” said CLIA President and CEO Kelly Craighead.The CLIA statement said cruise lines are working