WORLD CRUISE SHIPS (THE BIG 4)
The following are websites of the big 4 cruise players.
No.1: Carnival Corporation
Carnival Corporation
                Carnival Corporation
                  & PLC
                Advanced Air Quality Systems
                Carnival Passport
                Carnival Corporation (Online Store)
                Carnival Japan
Aida Cruises
                Aida-Fantreff. de
Carnival Cruise Lines
                Carnival Cruise Lines
                  (JPN)
Costa Cruises
                Costa Crociere (JPN)
                Costa Cruises (ASIA)
                Costa Crociere (ITA)
                Costa Crociere (BRA)
                Costa Cruises (GBR)
                Costa Kreuzfahrten
                  (GER)
Costa Webcam View
                The Parbuckling
                  Project
Cunard Image Library
                Cunard Line 
                Cunard Line 
                Cunard Line 
                Cunard Line 
                Queen Mary 2
Carnival
                  Japan
                Max Cruise (Japan)
Ibero Jet Cruceros
                Ibero Jet Cruceros Click
P&O Cruises
                  Australia
                P&O Cruises Australia
                  (NZL)
Princess Cruises
                Princess Cruises
                Princess Cruises (JPN)
                Princess Alaska Lodges
No.2: Royal Caribbean Group
Royal Caribbean Cruises
                  Ltd.(Royal Caribbean Group)
                Hyatt Corporation
Celebrity Cruises
                Celebrity Cruises
                  (GBR)
                Celebrity Cruises
                  (JPN)
Pullmantur Cruceros
                Pullmantur
Silversea Cruises
                Silversea Cruises (JPN)
                Silver Muse
                My Silversea
Royal Caribbean
                  International
                Royal Caribbean
                  International (GBR)
                Royal Caribbean
                  International (GER)
                Royal Caribbean
                  International (JPN)
                Royal Caribbean International
                  (KOR)
Allure of the Seas
                Oasia of the Seas
Hapag-Lloyd
                  Kreuzfahrten
                Hapag-Lloyd Cruises
                  (JPN)
                Hapag-Lloyd Cruises (USA)
                Hapag-Lloyd
                Euro Lloyd Travel Group
No.3: Norwegian Cruise Line Holdings
Norwegian Cruise Line
                Norwegian Cruise Line Holdings
                Norwegian Cruise Line (EUROPE)
                Norwegian Cruise Line (GBR)
                Norwegian Cruise Line (GER)
                Norwegian Cruise Line (JPN)
Prestige Cruise Holdings, Inc.
                Oceania Cruises
                Oceania Cruises
                Oceania Cruises (JPN)
                Regent Seven Seas Cruises
No.4: Mediterranean Shipping Cruises
Mediterranean Shipping
                  Cruises
                Mediterranean Shipping
                  Cruises (AUS)
                Mediterranean Shipping
                  Cruises (JPN)
                Mediterranean Shipping
                  Cruises (USA)
                MSC Cruises South Africa
Mediterranean Shipping Company
Information
Norwegian Cruise Line bought Prestige Cruises International, a parent company of Oceania Cruises & Regent Seven Seas Cruises in September 2014.
The Sun Princess of Princess Cruises, a brand of Carnival Corp. left Japan for Australia in 2015 because of a failure of attracting guests.
In May, 2015, Genting Hong Kong Limited bought Crystal Cruises, Inc. from Nippon Yusen Kaisha.
Aida Cruises has announced that the maiden voyage for the Aidaprima which was originally going to begin from Yokohama on October 1, 2015 have now been delayed. Because Mitsubishi Heavy Industries shipyard in Nagasaki is unable to deliver her on time.
On March 14, 2016, Mitsubishi Heavy Industries Ltd. (MHI) delivered the AIDAprima, built for AIDA Cruises at MHI's Nagasaki Shipyard & Machinery Works. On the day, the AIDAprima departed for Hamburg, Germany.
Carnival Corporation quit sailings under its fathom brand in 2016 because of a failure of attracting guests.
On March 19, Ctrip and Royal Caribbean announced that SkySea Cruise Line, a joint venture they established in 2014, will be ending operations.
On August 1, 2018, Royal Caribbean Cruises Ltd. announced that it has completed its acquisition of Silversea Cruises.
Pullmantur Cruceros, partially owned by Royal Caribbean Cruises Ltd., filed for reorganization in June, 2020.
In January 2021, Royal Caribbean Group said it is selling its Azamara Club Cruises for $201 million to private-equity firm Sycamore Partners.
On January 19, 2022, Genting Hong Kong announced that it filed for provisional liquidation to the Supreme Court of Bermuda.