What is Christina O?
{{italictitle}} [[File:Yacht CHRISTINA O.jpg|thumb|right|210px|The ''Christina O'']] '''''Christina O''''' is a private motor yacht that once belonged to billionaire Greek shipowner [[Aristotle Onassis]]. At 99.13 metres long, she was the 45th largest yacht in the world as of 2018.<ref>{{cite web|title=Top 100 Largest Yachts|url=http://www.superyachts.com/largest-yachts/worlds-largest-yachts-live.htm?property_length_type_id=1&p=3|url-status=live|website=Super Yachts|access-date=23 July 2018|archive-url=https://web.archive.org/web/20180723122513/http://www.superyachts.com/largest-yachts/worlds-largest-yachts-live.htm?property_length_type_id=1&p=3|archive-date=2018-07-23}}</ref><ref>{{cite web|url=https://www.onassis.org/people/aristotle-onassis|title=Aristotle Onassis: Τhe life and achievements of the man who became the quintessential cosmopolitan business magnate of the twentieth century|access-date=1 January 2021|website=Onassis Organization|url-status=live|archive-url=https://web.archive.org/web/20210504134620/https://www.onassis.org/people/aristotle-onassis/|archive-date=2021-05-04}}</ref><ref>{{cite web|people=Aristotle Onassis|date=1959|title=Greece: Shipping Magnate, Onassis Cruises|url=https://www.britishpathe.com/video/VLVA9OTACRJKHSAT3ELNMBTLLKU7A-NEWS-30-7-1958/query/Aristotle+onassis|access-date=2021-05-10|type=Motion picture|location=Greece|website=[[Pathé News|British Pathe]]}}</ref><ref>{{cite web|title=The Maria Callas Experience onboard the legendary Christina O yacht &ndash; archived link|url=http://mariacallasexperience.com/|url-status=dead|archive-url=https://web.archive.org/web/20120205144853/http://mariacallasexperience.com/experience1.htm|archive-date=2012-02-05|website=Maria Callas Experience|quote=A bespoke recital of operatic classics with a storyline of the life of Maria Callas by some of Europe's renowned Bel Canto Sopranos including Nelly Miricioiu, (20 & 21 May, 3, 4 & 5 June) Claire Rutter (22 & 29 May) and Mary Plazas (27 & 28 May). During the voyage a tour of the yacht will reveal