Princess Johanna Marina Eleoore of Hesse was orphaned at the age of fourteen months, when her family was killed in a plane crash, when the plane they were in hit what? 
Princess Johanna of Hesse and by Rhine: Princess Johanna Marina Eleonore of Hesse and by Rhine (Johanna Marina Eleonore Prinzessin und Landgräfin von Hessen; 20 September 1936 – 14 June 1939) was the third child and only daughter of Georg Donatus, Hereditary Grand Duke of Hesse, and Princess Cecilie of Greece and Denmark. Princess Johanna of Hesse and by Rhine:  She was orphaned at the age of fourteen months when her parents, older brothers Ludwig and Alexander and paternal grandmother Eleonore were killed in a plane crash on their way to a family wedding in London.
i don't know