For the third time in two months Sunday, luxury cruise ships sailed into South Florida ports bearing sick passengers. More than 100 passengers and crew arrived in Port Everglades on Princess Cruise's Sun Princess showing symptoms of norovirus, a gastrointestinal illness that resembles stomach flu. And 99 passengers and 11 crew members came down with the virus on Royal Caribbean's Freedom of the Seas -- for the second time in a week, said officials with the Miami-based cruise line and federal regulators. Freedom of the Seas, the world's largest cruise ship, was held over at the Port of Miami for additional cleaning under the direction of the Centers for Disease Control and Prevention.