This cruise ship, laid down on December 2008 is 50mm longer than a cruise ship laid down on what date?
MS Oasis of the Seas MS "Oasis of the Seas" is an "Oasis"-class cruise ship owned by Royal Caribbean International. Her hull was laid down in November 2007 and she was completed and delivered to Royal Caribbean in October 2009. At the time of construction, "Oasis of the Seas" set a new capacity record of carrying over 6,000 passengers. The first of her class, she was joined by sister ships  in December 2010 and  in May 2016. "Oasis of the Seas" conducts cruises of the Caribbean from her home port of Port Canaveral in Cape Canaveral, Florida.
Royal-class cruise ship The "Royal" class cruise ships is a class of cruise ships operated by Princess Cruises. The lead vessel of the class, "Royal Princess", was delivered in June 2013 for Princess Cruises. The 2015 MV Britannia is a similar design to the Royal class ships and is operated by P&O Cruises.