Cruise ships are organized much like floating hotels, with a complete hospitality staff in addition to the usual ship's crew. It is not uncommon for the most luxurious ships to have more crew and staff than passengers.
As with any vessel, adequate provisioning is crucial, especially on a cruise ship serving several thousand meals at each seating. Passengers and crew on the Royal Caribbean International ship Mariner of the Seas consume 20,000 pounds (9,000 kg) of beef, 28,000 eggs, 8,000 gallons (30,000 L) of ice cream, and 18,000 slices of pizza in a week.
Many older cruise ships have had multiple owners. Since each cruise line has its own livery and often a naming theme (for instance, ships of the Holland America Line have names ending in "-dam", e.g. MS Statendam, and Royal Caribbean's ships' names all end with "of the Seas", e.g. MS Freedom of the Seas), it is usual for the transfer of ownership to entail a refitting and a name change. Some ships have had a dozen or more identities.
Cruise ships and former liners often find employment in applications other than those for which they were built. A shortage of hotel accommodation for the 2004 Summer Olympics led to a plan to moor a number of cruise ships in Athens to provide tourist accommodation. On September 1, 2005, FEMA contracted three Carnival Cruise Lines vessels to house Hurricane Katrina evacuees.