Jacqueline Kennedy Onassis followed her everywhere and nicknamed her "Jackie O". During their marriage, the couple inhabited six different residences: her 15-room Fifth Avenue apartment in Manhattan, her horse farm in New Jersey, his Avenue Foch apartment in Paris, his private island Skorpios, his house in Athens, and his yacht "Christina O". Kennedy ensured that her children continued a connection with the Kennedy family by having Ted Kennedy visit them often. She developed a close relationship with Ted, and from then on he was involved in her public appearances. Aristotle Onassis' health deteriorated rapidly following the death of his son Alexander in a
Alexander Onassis relationship with Fiona Thyssen, former wife of Hans Heinrich Thyssen-Bornemisza. He was later appointed the head of Olympic Aviation, a Greek regional airline owned by his father. Onassis died in hospital as a result of injuries sustained in an air crash at Hellinikon International Airport at the age of 24. The Alexander S. Onassis Foundation was established in his memory. Alexander Socrates Onassis was born at the Harkness Pavilion, a private clinic in New York City's NewYork–Presbyterian Hospital. He was the elder child of the Greek shipping magnate Aristotle Onassis (1906 –1975) and his first wife, Athina Livanos (1929 –1974),