Question: 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? 
Sentence (from "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.
Relevant evidence: Yes