The Lost World 1925

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Director: Harry O. Hoyt
Writers: Arthur Conan Doyle / Marion Fairfax

An expedition to rescue Maple White, who has been marooned at the top of a high plateau. Joined by hunter John Roxton, and others, the group goes to South America, where they do indeed find a plateau inhabited by prehistoric creatures, one of which they even manage to bring back to London with them.
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In April 1925, on a London-Paris flight by Imperial Airways, The Lost World (1925) became the first in-flight movie to be shown to airline passengers.